WO2011024762A1 - ロードロック装置及び処理システム - Google Patents
ロードロック装置及び処理システム Download PDFInfo
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- WO2011024762A1 WO2011024762A1 PCT/JP2010/064194 JP2010064194W WO2011024762A1 WO 2011024762 A1 WO2011024762 A1 WO 2011024762A1 JP 2010064194 W JP2010064194 W JP 2010064194W WO 2011024762 A1 WO2011024762 A1 WO 2011024762A1
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- load lock
- lock device
- chamber
- atmospheric
- gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/67201—Apparatus for manufacturing or treating in a plurality of work-stations characterized by the construction of the load-lock chamber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67739—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68735—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge profile or support profile
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68785—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the mechanical construction of the susceptor, stage or support
Definitions
- the present invention relates to a processing system for processing an object to be processed such as a semiconductor wafer and a load lock device used therefor.
- a so-called cluster tool type processing system as disclosed in, for example, Patent Document 1 or 2 is known.
- This processing system includes a common transfer chamber that can be maintained in a vacuum atmosphere, and a plurality of single-wafer processing apparatuses connected to the common transfer chamber. The semiconductor wafers are sequentially transferred to each processing apparatus via a common transfer chamber, and predetermined processing is performed in each processing apparatus.
- one or a plurality of small-capacity load lock devices that can selectively realize a vacuum atmosphere state and an atmospheric pressure atmosphere state are connected to a common transfer chamber.
- a cooling mechanism such as a cooling plate, for cooling a semiconductor wafer that is in a high temperature state by heat treatment in the processing apparatus to a safe temperature, for example, about 100 ° C.
- the semiconductor wafer can be taken out after being cooled to 100 ° C. or lower.
- Patent Document 1 Japanese Patent Laid-Open No. 2007-027378
- Patent Document 2 Japanese Patent Laid-Open No. 2007-194582
- each processing apparatus is a so-called single wafer processing apparatus that processes semiconductor wafers one by one.
- a processing system has also been proposed in which a processing apparatus for simultaneously processing a plurality of, for example, about 4 to 25 semiconductor wafers at a time is incorporated.
- the conventional load lock device has a structure that can cool only one semiconductor wafer at a time. That is, since a plurality of semiconductor wafers cannot be cooled at a time, the throughput is reduced.
- a load lock chamber is considered in which a semiconductor wafer is held in a plurality of stages.
- the load lock chamber disclosed here is for releasing a semiconductor wafer in an inert gas atmosphere to the atmosphere, and the load lock chamber as disclosed in Japanese Patent Application Laid-Open No. 2003-332323 is used in a vacuum atmosphere and an atmospheric pressure atmosphere. Therefore, it cannot be applied to the load lock chamber as it is so that the semiconductor wafer can be carried in and out.
- the present invention has been made in view of the above, and it is possible to maintain a high throughput by increasing the cooling efficiency and to uniformly cool a plurality of stages of objects to be processed so as not to cause a temperature difference between the surfaces.
- a possible load lock device and processing system are provided.
- a first aspect of the present invention is a load lock device that is connected between a vacuum chamber and an atmospheric chamber via a gate valve and can selectively realize a vacuum atmosphere and an atmospheric pressure atmosphere,
- a load lock container a support means provided in the load lock container and supporting a plurality of objects to be processed in a plurality of stages, and a support for injecting a gas for returning to atmospheric pressure as a cooling gas
- a load lock device comprising a gas introducing means having a gas injection hole provided corresponding to a portion, and an evacuation system for evacuating the atmosphere in the load lock container.
- the second aspect of the present invention is a vacuum in which a processing chamber capable of heat-treating a plurality of objects to be processed at a time is connected, and a vacuum transfer mechanism for transferring the objects to be processed is provided therein.
- a vacuum chamber composed of a transfer chamber and an atmosphere at atmospheric pressure or a pressure close to atmospheric pressure, and an atmosphere transfer mechanism for transferring the object to be processed is provided to carry the object to be processed between the atmosphere side or
- a processing system including an air chamber composed of an air transfer chamber to be carried out, and a load lock device according to a first aspect provided between a vacuum chamber and an air chamber.
- a vacuum chamber composed of a processing chamber capable of heat-treating a plurality of objects to be processed at a time, and an atmosphere having an atmospheric pressure or a pressure close to atmospheric pressure.
- a load lock device provided between the vacuum chamber and the atmospheric chamber, and an atmospheric chamber composed of an atmospheric conveyance chamber that is provided with an atmospheric conveyance mechanism for conveying the object to and from the atmosphere side.
- a processing system includes a load lock device provided with a load lock transport mechanism that can be bent and stretched and swiveled to transport an object to be processed in the load lock container.
- FIG. 1 It is a schematic block diagram which shows an example of the processing system which has the load lock apparatus of this invention. It is a longitudinal cross-sectional view which shows the load lock apparatus of this invention. It is an expanded partial sectional view of the support means which supports a to-be-processed object. It is a top view which shows an example of the support part of a support means. It is an enlarged view which shows the cross section of the support means of the modification 1 of a load lock apparatus. It is an expanded partial sectional view which shows the support means of the modification 2 of a load lock apparatus. It is a schematic plan view which shows an example of the processing system containing the modification 3 of the load lock apparatus of this invention.
- the load lock device and processing system according to the embodiment of the present invention can provide the following excellent effects / advantages.
- a load lock device that is connected between a vacuum chamber and an air chamber via a gate valve and can selectively realize a vacuum atmosphere and an atmospheric pressure atmosphere
- a plurality of objects to be processed are provided in the load lock container.
- Injecting gas formed in correspondence with the support portion in order to inject an atmospheric pressure return gas that returns the inside of the load lock container to the atmospheric pressure as a cooling gas. Since the gas introducing means having holes is provided, when the object to be processed is carried out to the atmosphere chamber side, the cooling efficiency can be increased and the throughput can be maintained high. It is possible to cool uniformly so as not to occur.
- the warmed cooling gas is removed after the load lock container is returned to atmospheric pressure. It is possible to positively discharge from the upper portion of the load lock container, and accordingly, the cooling efficiency can be further increased.
- a temperature measuring unit provided in the support unit and an opening operation limiting unit that limits the opening operation of the gate valve between the load lock container and the atmospheric chamber based on the measurement value of the temperature measuring unit are further provided.
- the gate valve can be opened after the object to be processed is reliably lowered to a desired temperature, and safety can be improved.
- FIG. 1 is a schematic configuration diagram showing an example of a processing system having a load lock device of the present embodiment
- FIG. 2 is a longitudinal sectional view showing the load lock device of the present embodiment
- FIG. 3 is a support means for supporting an object to be processed.
- FIG. 4 is a plan view showing an example of a support portion of the support means.
- this processing system 2 includes a plurality of, for example, first to third processing chambers 4A, 4B, and 4C that function as three vacuum chambers, and a vacuum that functions as a substantially hexagonal vacuum chamber. It mainly includes a transfer chamber 6, load lock devices 8 and 10 according to the first and second embodiments having a load lock function, and an atmospheric transfer chamber 12 functioning as an elongated atmospheric chamber.
- the two processing chambers 4A and 4B are each a single-wafer processing chamber, and one semiconductor wafer W is mounted on each mounting table 14A and 14B.
- the semiconductor wafers are processed one by one.
- the third processing chamber 4C is a so-called batch type processing chamber, and the mounting table 14C simultaneously processes a plurality of semiconductor wafers W in the illustrated example. Can do.
- the mounting table 14C is rotatable, for example, in order to maintain the uniformity of processing between semiconductor wafers.
- various treatments can be performed as necessary in a vacuum atmosphere.
- heat treatment such as thermal CVD, thermal diffusion, and annealing is performed on the semiconductor wafer, and the temperature of the semiconductor wafer reaches about 150 to 700 ° C. depending on the case.
- the first to third processing chambers 4A to 4C are coupled to the three sides of the substantially hexagonal vacuum transfer chamber 6, and the first and second load locks are connected to the other two sides.
- Devices 8 and 10 are respectively coupled.
- the atmospheric transfer chamber 12 is commonly connected to the opposite surfaces of the first and second load lock devices 8 and 10.
- Gate valves G are provided, whereby the processing chambers 4A to 4C and the first and second load lock devices 8 and 10 can communicate with the inside of the vacuum transfer chamber 6 as necessary.
- the inside of the vacuum transfer chamber 6 is evacuated to a vacuum atmosphere.
- a gate valve G that can be opened and airtightly closed is also provided between the first and second load lock devices 8 and 10 and the atmospheric transfer chamber 12.
- the first and second load lock devices 8 and 10 are evacuated and returned to atmospheric pressure as the semiconductor wafer is carried in and out.
- a vacuum transfer mechanism 16 composed of an articulated arm that can be bent and stretched and swiveled is located at a position where the two load lock devices 8, 10 and the three processing chambers 4A to 4C can be accessed. It has two picks 16A and 16B that can bend and stretch independently in opposite directions, and can handle two semiconductor wafers at a time. A vacuum transfer mechanism 16 having only one pick can also be used.
- the atmospheric transfer chamber 12 is formed by a horizontally long box, and one or a plurality of (three in the illustrated example) inlets for introducing a semiconductor wafer as an object to be processed are formed on one side of the horizontally long.
- Each doorway is provided with an opening / closing door 18 that can be opened and closed.
- An introduction port 20 is provided corresponding to each of the carry-in ports, and the cassette container 22 can be placed correspondingly.
- Each cassette container 22 can accommodate a plurality of, for example, 25 semiconductor wafers W placed in multiple stages at equal pitches.
- the cassette container 22 can be sealed and filled with an inert gas such as N 2 gas.
- the inside of the atmospheric transfer chamber 12 is maintained at a substantially atmospheric pressure by, for example, N 2 gas or clean air. Specifically, the inside of the atmospheric transfer chamber 12 is maintained in a positive pressure state by atmospheric pressure or a pressure slightly lower than atmospheric pressure (for example, about 1.3 Pa).
- an atmospheric transfer mechanism 24 for transferring the semiconductor wafer W along its longitudinal direction is provided.
- the atmospheric transfer mechanism 24 includes two picks 24A and 24B that can be bent and stretched, and can handle two semiconductor wafers W at a time.
- the atmospheric transfer mechanism 24 is slidably supported on a guide rail 26 provided in the atmospheric transfer chamber 12 so as to extend along the length direction thereof.
- an orienter 28 for aligning the semiconductor wafer is provided at one end of the atmospheric transfer chamber 12.
- the orienter 28 has a turntable 28A that is rotated by a drive motor, on which the semiconductor wafer W is placed and rotated.
- An optical sensor 28B for detecting the peripheral edge of the semiconductor wafer W is provided on the outer periphery of the turntable 28A. Thereby, a positioning notch of the semiconductor wafer W, for example, a position of a notch or an orientation flat or the center of the semiconductor wafer W is provided. The amount of misalignment can be detected.
- the processing system 2 has a system control unit 30 composed of, for example, a computer in order to control the operation of the entire system.
- a program necessary for controlling the operation of the entire processing system is stored in a storage medium 32 such as a flexible disk, a CD (Compact Disc), a hard disk, or a flash memory.
- a storage medium 32 such as a flexible disk, a CD (Compact Disc), a hard disk, or a flash memory.
- load lock devices 8 and 10 will be described with reference to FIGS. Since these load lock devices 8 and 10 have the same configuration and operate in the same manner, one load lock device 8 will be described here as an example, and description of the other load lock device 10 will be omitted.
- the load lock device 8 has a load lock container 34 formed in a vertically long shape.
- the load lock container 34 is formed in a box shape from a metal such as an aluminum alloy or stainless steel.
- a loading / unloading port 36 for loading and unloading the semiconductor wafer W is provided in the middle stage on one side of the load lock container 34, and the vacuum transfer chamber 6 is connected to the loading / unloading port 36 via a gate valve G.
- a loading / unloading port 38 for loading / unloading the semiconductor wafer W is provided at a position opposite to the vacuum loading / unloading port 36 in the middle stage on the other side of the load lock container 34, and a gate valve G is provided at the loading / unloading port 38.
- the atmospheric transfer chamber 12 is connected via the via.
- a vacuum exhaust port 40 is provided at the bottom 34A of the load lock container 34, and a vacuum exhaust system 42 for evacuating the load lock container 34 is provided at the vacuum exhaust port 40.
- the vacuum exhaust system 42 has a vacuum exhaust gas passage 44 connected to the vacuum exhaust port 40, and the vacuum exhaust gas passage 44 is sequentially provided with an opening / closing valve 46 and a vacuum pump 48. It has been.
- a support means 50 having a support portion 52 that supports a plurality of semiconductor wafers W to be processed in a plurality of stages.
- the support means 50 has a plurality of upright columns 54A, 54B, 54C and 54D arranged in a square shape as shown in FIGS.
- the upper ends of these four columns 54A to 54D are integrally connected to the top plate 56, and the lower ends are integrally connected to the bottom plate 58.
- the support 54A and the support 54C are arranged at a distance slightly larger than the diameter of the semiconductor wafer W so that the semiconductor wafer W can be placed between them, and the support 54B and the support 54D are also interposed therebetween.
- the semiconductor wafers W are arranged at intervals slightly larger than the diameter of the semiconductor wafer W so that the semiconductor wafers W can be arranged.
- the support portions 52 are attached to the support posts 54A to 54D in a plurality of stages, that is, in four stages at a predetermined pitch along the longitudinal direction, and four semiconductor wafers can be held therein.
- the support portion 52 is composed of a pair of shelf members 58A and 58B arranged so as to face each other, and one shelf member 58A of the pair of shelf members 58A and 58B is formed by the two columns 54A and 54B.
- the other shelf member 58B is horizontally mounted so as to be bridged between the two columns 54C and 54D.
- the opposing sides of the shelf members 58A and 58B are formed in an arc shape along the periphery of the semiconductor wafer W.
- the semiconductor wafer W is placed on the shelf members 58A and 58B so that the rear surface (lower surface) of the peripheral portion of the semiconductor wafer W is in contact with the upper surface side of the shelf members 58A and 58B, and the semiconductor wafer W is supported.
- the predetermined pitch at which the support portions 52 are provided is within a range of, for example, 10 to 30 mm so that the picks 16A and 16B of the vacuum transfer mechanism 16 holding the semiconductor wafer W and the picks 24A and 24B of the atmospheric transfer mechanism 24 can enter. Is set to
- FIG. 4 shows a state in which the support means 50 is viewed from a direction different by 90 degrees in order to facilitate understanding of the configuration of the present embodiment.
- the support means 50 is formed of one or more materials selected from the group consisting of ceramic materials, quartz, metals, and heat resistant resins.
- the columns 54A to 54B, the top plate 56, and the bottom plate 58 are preferably made of a metal such as an aluminum alloy, and the support portion 52 that is in direct contact with the semiconductor wafer W is a heat-resistant member such as quartz or a ceramic material. It is preferable to make it.
- the gas introduction means 72 having the gas injection holes 74 provided corresponding to the support portion 52 is provided on the support means 50.
- the gas introduction means 72 has a gas introduction path 76 formed in the support means 50.
- a gas introduction path 76 is formed along the longitudinal direction in each of the four columns 54A to 54D, and the gas introduction path 76 penetrates through each shelf member 58 as the support portion 52.
- a gas nozzle 78 is formed in the horizontal direction.
- the tip of the gas nozzle 78 is a gas injection hole 78.
- the cooling gas can be injected in the horizontal direction in correspondence with the support portion 52. Therefore, here, one semiconductor wafer W is cooled by the cooling gas injected from the four gas injection holes 74.
- the number of the gas injection holes 74 for the single semiconductor wafer W is not limited to four, and may be smaller or larger.
- the bottom plate 58 is formed with a communication passage 80 (see FIG. 3) that communicates with the four gas introduction passages 76 in common, and the communication passage 80 passes through the bottom 34A of the load lock container 34 in an airtight manner. And connected to a gas pipe 82 drawn to the outside. A part of the gas pipe 82 located in the load lock container 34 is provided with a bellows part 82A that can be expanded and contracted so that the bellows part 82A can follow and expand and contract as the support means 50 moves up and down. It has become.
- an on-off valve 84 is interposed in the middle of the gas pipe 82 so that the atmospheric pressure return gas can be supplied as a cooling gas as required.
- the He gas may be an inert gas such as rare gas or N 2 gas, such as Ar gas, is used N 2 gas here.
- N 2 gas such as Ar gas
- the temperature of the cooling gas is preferably set according to the temperature of the semiconductor wafer to be cooled. For example, a cooling gas temperature of about room temperature is sufficient.
- the bottom plate 58 of the support means 50 formed as described above is installed on the lifting platform 62, and the support means 50 can be moved up and down.
- the lifting platform 62 is attached to the upper end portion of the lifting rod 64 inserted through a through hole 66 formed in the bottom portion 34 ⁇ / b> A of the load lock container 34.
- An actuator 68 is attached to the lower end portion of the elevating rod 64 so that the elevating rod 64 can be moved up and down.
- the actuator 68 can be stopped in multiple stages by causing the lifting platform 62 to correspond to the position of the support portion 52 at an arbitrary position in the vertical direction.
- a metal bellows 70 that can be expanded and contracted is attached to the portion of the through hole 66 of the lifting rod 64 so that the lifting rod 64 can be moved up and down while maintaining the airtightness in the load lock container 34. It has become.
- the load lock container 34 is provided with an opening exhaust system 90 for releasing the pressure of the atmosphere in the load lock container 34 to the outside.
- the opening exhaust system 90 has a gas exhaust port 92 provided in the upper part of the load lock container 34.
- the gas exhaust port 92 is provided in the ceiling portion 34 ⁇ / b> B of the load lock container 34.
- An opening gas passage 94 is connected to the gas exhaust port 92, and a relief valve 96 is provided in the middle of the opening gas passage 94.
- the relief valve 96 opens when the pressure difference between the inlet and the outlet of the relief valve 96 exceeds a predetermined pressure difference. Therefore, the relief valve 96 is opened when the pressure in the load lock container 34 becomes larger than the pressure downstream of the opening gas passage 94 by a predetermined pressure.
- the opening gas passage 94 communicates with the atmospheric transfer chamber 12 which is an atmospheric chamber.
- the downstream side of the opening gas passage 94 may be opened to the atmosphere side (in the clean room in which the processing system 2 is installed).
- the predetermined pressure difference at which the relief valve 96 opens is set to about 1.3 Pa, for example.
- the support part 52 of the support means 50 is provided with, for example, a thermocouple 98 as a measure measuring means, and the temperature of the semiconductor wafer supported by the support part 52 can be measured. And the measured value of the thermocouple 98 is input into the opening operation
- the opening operation restriction unit 100 outputs an opening operation permission signal for the gate valve G of the atmospheric transfer chamber 12 to the system control unit 30. It has become.
- the thermocouple 98 is provided in the support portion 52 positioned at the uppermost stage among the support portions 52 provided in a plurality of stages.
- thermocouple 98 is provided in the support sections 52 of two or more stages, or four stages.
- the opening operation permission signal may be output when the measured values of all the thermocouples 98 are measured at 100 ° C.
- the other second load lock device 10 is configured in the same manner as the first load lock device 8 as described above.
- the positioned semiconductor wafer W is transported again by the atmospheric transport mechanism 24 and is carried into one of the first or second load lock devices 8 and 10.
- the four semiconductor wafers W are supported on the support means 50 in the load lock device.
- an unprocessed semiconductor wafer W in the load lock device is brought into the vacuum transfer chamber 6 by using the vacuum transfer mechanism 16 in the vacuum transfer chamber 6 that has been evacuated in advance. It is captured.
- the unprocessed semiconductor wafer W is, for example, sequentially processed in the first processing chamber 4A and the second processing chamber 4B, and then transferred into the third processing chamber 4C.
- the four semiconductor wafers W are placed on the mounting table 14C in the third processing chamber 4C.
- a predetermined heat treatment such as thermal CVD, annealing, or thermal oxidation diffusion is performed in the third processing chamber 4C, and the semiconductor wafer temperature is heated to, for example, about 150 to 700 ° C. depending on the case.
- the high-temperature semiconductor wafer W is transferred to any of the first and second load lock devices 8 and 10 by the vacuum transfer mechanism 16.
- One of them is sequentially transported to the supporting means 50 in the load lock device maintained in a vacuum state in advance, for example, the first load lock device 8 and supported in multiple stages.
- the gate valve G on the vacuum transfer chamber 6 side is closed to seal the first load lock device 8, and N 2 gas that is an atmospheric pressure return gas and a cooling gas is introduced into the load lock device 8. While cooling, the four semiconductor wafers W are cooled.
- the relief valve 96 is opened to achieve a pressure balance with the atmospheric transfer chamber 12, and the temperature of the semiconductor wafer W becomes 100 ° C. or lower. Then, the gate valve G on the atmosphere transfer chamber 12 side is opened to communicate the inside of the load lock device 8 with the atmosphere transfer chamber 12, and the four processed semiconductor wafers W in the load lock device 8 are transferred to the atmosphere transfer mechanism. 24 are sequentially taken out and returned to the cassette container 22 for storing processed semiconductor wafers. Thereafter, the same operation is repeated.
- the pick 16A holding the semiconductor wafer W is inserted above the support portion 52 to be supported, By driving the actuator 68 in this state, the entire support means 50 is raised by a predetermined distance, whereby the semiconductor wafer W held on the pick 16A is transferred and supported on the support portion 52. Then, the transfer is completed by extracting the pick 16A.
- the empty pick 16A is supported by the support part 52 supporting the semiconductor wafer W to be transferred.
- the actuator 68 is driven to lower the entire support means 50 by a predetermined distance.
- the semiconductor wafer W supported by the support portion 52 is transferred onto the pick 16A.
- the transfer is completed by extracting the pick holding the semiconductor wafer W.
- the pitch of the support portions 52 is set within the range of 10 to 30 mm, the support means 50 can be reduced in size, and the lifting / lowering stroke of the support means 50 can be shortened, thereby delivering high throughput. it can.
- the high-temperature semiconductor wafer W after the heat treatment is cooled, and at the same time, the pressure in the load lock container 34 is returned to the atmospheric pressure.
- the four semiconductor wafers W that have been heated to a high temperature of about 150 to 700 ° C. by the heat treatment in the third processing chamber 4C are the load locks that have been previously in a vacuum state of one of the load lock devices. It supports by each support part 52 of the support means 50 in the container 34 using the vacuum conveyance mechanism 16 (refer FIG. 2).
- the load lock container 34 is sealed by closing the gate valve G on the vacuum transfer chamber 6 side.
- the on-off valve 84 of the gas introduction means 72 is opened, and N 2 gas that serves as both the atmospheric pressure return gas and the cooling gas is introduced at a predetermined flow rate.
- the introduced N 2 gas flows through the gas introduction paths 76 formed in the columns 54 A to 54 D of the support means 50 via the gas pipes 82, and further from the gas nozzles 78 communicated with the gas introduction paths 76.
- the gas is injected from the gas injection holes 74 at the front end in the horizontal direction and hits the back surface of the semiconductor wafer W.
- the gas injection holes 74 are provided corresponding to the respective support portions 52, the four semiconductor wafers W supported by the respective support portions 52 are substantially simultaneously caused by the injected N 2 gas. It will be cooled. In this case, since one semiconductor wafer W is cooled by N 2 gas injected from the four gas injection holes 74, the semiconductor wafer W can be efficiently cooled. Moreover, since the injection of N 2 gas from the gas injection holes 74 provided in the support portions 52 as described above, it can be maintained high throughput by increasing the cooling efficiency. Moreover, each semiconductor wafer is cooled at the same cooling rate, and the entire semiconductor wafer can be uniformly cooled without causing a temperature difference between the semiconductor wafers.
- each semiconductor wafer W is cooled and at the same time, the inside of the load lock container 34 gradually returns to the atmospheric pressure, and when the pressure becomes slightly higher than the atmospheric pressure, the opening gas passage 94 of the opening exhaust system 90.
- the relief valve 96 provided in the middle of the opening is opened, and the pressure in the atmospheric transfer chamber 12 is balanced by releasing the pressure in the load lock container 34.
- the N 2 gas warmed by the cooling of the semiconductor wafer in the load lock container 34 is stored in the upper part of the load lock container 34. Then, the warmed N 2 gas is positively discharged to the opening gas passage 94 side through the gas exhaust port 92 provided in the ceiling portion 34B, and new cooling gas N 2 gas is sequentially introduced. Therefore, the cooling rate can be further increased.
- the inside of the atmospheric transfer chamber 12 that is the discharge destination of the warmed cooling gas is set to a positive pressure by a slight pressure from the atmospheric pressure as described above. Accordingly, the inside of the load lock container 34 has an atmosphere of a pressure higher than the atmospheric pressure by the total pressure corresponding to the positive pressure and the differential pressure of the relief valve 96. Further, in the process of returning to the atmospheric pressure, the temperature of the semiconductor wafer W is measured by the thermocouple 98 provided in the support portion 52. When the measured value becomes a safe temperature, for example, 100 ° C. or less, the opening operation limit is set. The unit 100 outputs an opening operation permission signal to the system control unit 30.
- the system control unit 30 closes the on-off valve 84 of the gas introduction means 72 to stop the supply of N 2 gas, and opens the gate valve G between the load lock container 34 and the atmospheric transfer chamber 12, and 100
- the unloading operation as described above is performed for the semiconductor wafer W that has been cooled to a temperature of 0 ° C. or lower.
- the time required for the semiconductor wafer temperature to become 100 ° C. or less is obtained in advance due to the relationship between the semiconductor wafer temperature before cooling and the supply time of the cooling gas.
- this time may be stored as a parameter in the system control unit 30 for control. According to this, by referring to this parameter, the supply of the cooling gas can be stopped and the gate valve can be opened.
- the load lock device that is connected through the gate valve between the vacuum chamber and the atmospheric chamber and can selectively realize the vacuum atmosphere and the atmospheric pressure atmosphere
- a gas for returning to atmospheric pressure as a cooling gas
- the load lock container 34 In order to inject a gas for returning to atmospheric pressure as a cooling gas by providing a support means 50 having a support portion 52 for supporting a plurality of objects to be processed, for example, semiconductor wafers W in a plurality of stages, in the load lock container 34. Since the gas introducing means 72 having the gas injection holes 74 formed corresponding to the support portion 52 is provided, the cooling efficiency can be improved and the throughput can be kept high when the object to be processed is carried out to the atmosphere chamber side. In addition, the plurality of stages of objects to be processed can be uniformly cooled so as not to cause a temperature difference between the surfaces.
- the warmed cooling gas can be removed from the load lock container 34 after returning to the atmospheric pressure. It is possible to positively discharge from the upper part of the container 34, and accordingly, the cooling efficiency can be further increased.
- a temperature measuring unit 98 provided in the support unit 52, and an opening operation limiting unit 100 that limits the opening operation of the gate valve G between the load lock container 34 and the atmospheric chamber based on the measurement value of the temperature measuring unit 98.
- the gate valve G can be opened after the object to be processed is reliably lowered to a desired temperature, and safety can be improved.
- FIG. 5 is an enlarged view showing a cross section of the support means of the first modified example of the load lock device.
- the same components as those described in FIGS. 1 to 4 are denoted by the same reference numerals.
- the individual pin members 102A, 102B, 102C, and 102D are provided in the horizontal direction as the support portions 52 for the respective columns 54A to 54D of the support means 50. Then, the semiconductor wafer W is supported by the pin members 102A to 102D so that the back surface of the semiconductor wafer W is in contact with the upper surfaces of the pin members 102A to 102D.
- the same material as the shelf members 58A and 58B can be used as the material of the pin members 102A to 102D.
- a gas nozzle 78 and a gas injection hole 74 having the same structure as those shown in FIG.
- the gas nozzle 78 and the gas injection hole 74 are provided in the support portion 52 including the shelf members 58A and 58B and the pin members 102A to 102D. 74 may be provided on the columns 54A to 54D, respectively.
- FIG. 6 is an enlarged partial cross-sectional view showing the support means of the modified embodiment 2 of such a load lock device.
- the same components as those described in FIGS. 1 to 5 are denoted by the same reference numerals.
- the gas nozzle 78 and the gas injection hole 74 communicated with each of the columns 54A to 54D to the gas introduction path 76 are respectively provided below the support portion 52 including the shelf members 58A and 58B and the pin members 102A to 102D.
- N 2 gas is injected from the gas injection hole 74 as an inert gas that serves as both the atmospheric pressure return gas and the cooling gas.
- FIG. 7 is a schematic plan view showing an example of a processing system including a third modified example of the load lock device according to the embodiment of the present invention.
- the same components as those described in FIGS. 1 to 6 are denoted by the same reference numerals.
- the processing chamber 4C which is a vacuum chamber, is directly connected to one end of the load lock device 8 (10) via the gate valve G.
- the processing chamber 4C heat treatment is performed on four semiconductor wafers W at a time in a vacuum atmosphere.
- the lateral length of the load lock container 34 is set to be a little longer, and the vacuum transfer mechanism 16 is provided in the load lock container 34 in series with the support means 50.
- the vacuum transfer mechanism 16 has picks 16A and 16B arranged in two stages in the vertical direction and can be moved up and down.
- the vacuum transfer mechanism 16 delivers the semiconductor wafer W between the mounting table 14C in the processing chamber 4C and the support means 50 in the load lock container 34.
- the support means 50 all the support means described above with reference to FIGS. 1 to 6 are applied.
- the modified embodiment 3 as described above the same effects / advantages as in the previous embodiment can be provided.
- the support means 50 has four support portions 52 (four stages of support portions 52) arranged in the vertical direction. It is not limited to. For example, since one cassette container can accommodate 25 semiconductor wafers, the support means 50 may have 25 support parts 52 (25-stage support parts 52) along this. Similarly, the number of semiconductor wafers that can be heat-treated at once in the processing chamber 4C is not limited to four. It is preferable that the number of support portions 52 be the same as the number of semiconductor wafers that can be processed at a time in the processing chamber 4C.
- the gas introduction path 76 is formed in each of the columns 54A to 54D of the support means 50.
- the present invention is not limited to this, and the gas is introduced outside the columns 54A to 54D.
- a gas pipe that forms the introduction path 76 may be provided.
- the semiconductor wafer includes a silicon substrate and a compound semiconductor substrate such as GaAs, SiC, and GaN, and is not limited to these substrates.
- the present invention can also be applied to glass substrates, ceramic substrates, and the like used in display devices.
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Abstract
Description
特許文献2:特開2007-194582号公報
まず、本発明の実施形態によるロードロック装置を有する処理システムについて説明する。図1は、本実施形態のロードロック装置を有する処理システムの一例を示す概略構成図、図2は本実施形態のロードロック装置を示す縦断面図、図3は被処理体を支持する支持手段の拡大部分断面図、および図4は支持手段の支持部の一例を示す平面図である。
次に図2から図4も参照してロードロック装置8、10について説明する。これらのロードロック装置8、10は互いに同じ構成になされ、且つ同じ動作をするので、ここでは一方のロードロック装置8を例にとって説明し、他方のロードロック装置10の説明は省略する。
このように、構成された処理システム2及びロードロック装置8、10における概略的な動作について説明する。まず、導入ポート20に設置されたカセット容器22からは、未処理の例えばシリコン基板よりなる半導体ウエハWが大気搬送機構24により大気搬送室12内に取り込まれ、この取り込まれた半導体ウエハWは大気搬送室12の一端に設けたオリエンタ28へ搬送されて、ここで位置決めがなされる。
次に、本実施形態のロードロック装置の変形実施例について説明する。上記の例にあっては、半導体ウエハWを支持する支持部52として棚部材58A、58Bは、棚部材58Aが支柱54Aおよび54Bの間に橋渡しされ、棚部材58Bが支柱54Cおよび54D間に橋渡しされるように配置されたが、これに限定されず、支柱58A~58Dに対応して個別のピン部材を設けるようにしてもよい。図5はこのようなロードロック装置の変形実施例1の支持手段の断面を示す拡大図である。尚、図5において、図1乃至図4にて説明した構成部分と同一構成部分については同一参照符号を付してある。
次に本実施形態のロードロック装置の変形実施例2について説明する。上記の実施例にあっては、棚部材58A、58Bやピン部材102A~102Dよりなる支持部52にガスノズル78及びガス噴射孔74を設けたが、これに限定されず、ガスノズル78及びガス噴射孔74をそれぞれ支柱54A~54Dに設けるようにしてもよい。
次に本実施形態のロードロック装置の変形実施例3について説明する。上記の実施例にあっては、ロードロック装置の一方には真空室として真空搬送室6を連結した場合を例にとって説明したが、これに限定されず、真空室として一度に複数枚の熱処理を行う処理室4Cを連結するようにしてもよい。図7はこのような本発明の実施形態によるロードロック装置の変形実施例3を含む処理システムの一例を示す概略平面図である。尚、図7において、図1乃至図6にて説明した構成部分と同一構成部分については同一参照符号を付している。
Claims (16)
- 真空室と大気室との間にゲートバルブを介して連結され、真空雰囲気と大気圧雰囲気とを選択的に実現することができるロードロック装置において、
ロードロック容器と、
前記ロードロック容器内に設けられて複数枚の被処理体を複数段に亘って支持する支持部を有する支持手段と、
前記ロードロック容器内の雰囲気を大気圧に復帰する大気圧復帰ガスを冷却ガスとして噴射するように前記支持部に対応させて設けられたガス噴射孔を有するガス導入手段と、
前記ロードロック容器内の雰囲気を真空排気する真空排気系と、
を備えるロードロック装置。 - 前記支持手段は、起立した複数本の支柱を有しており、前記支柱に前記支持部が所定のピッチで設けられている、請求項1記載のロードロック装置。
- 前記ガス導入手段は、前記支持手段に形成されたガス導入路を有する、請求項1記載のロードロック装置。
- 前記支持手段は、昇降可能になされた昇降台上に設置されている、請求項1記載のロードロック装置。
- 前記支持部は、前記被処理体の裏面と接触する棚部材を有する、請求項1記載のロードロック装置。
- 前記支持部は、前記被処理体の裏面と接触するピン部材を有する、請求項1記載のロードロック装置。
- 前記ロードロック容器内の雰囲気の圧力を外部へ開放するための開放用排気系が更に設けられる、請求項1記載のロードロック装置。
- 前記開放用排気系のガス排気口は、前記ロードロック容器の上部に設けられている、請求項7に記載のロードロック装置。
- 前記開放用排気系は、前記ロードロック容器内の圧力が所定の圧力を超えたときに開いて大気と連通するリリーフ弁を有する、請求項7記載のロードロック装置。
- 前記開放用排気系は、前記ロードロック容器内の圧力が所定の圧力を超えたときに開いて前記大気室と連通するリリーフ弁を有する、請求項7記載のロードロック装置。
- 前記大気室は、大気圧よりも僅かな圧力だけ陽圧に維持され得る、請求項1記載のロードロック装置。
- 前記支持部に設けられた温度測定手段と、
該温度測定手段の測定値に基づいて前記ロードロック容器と前記大気室との間のゲートバルブの開動作を制限する開動作制限部と
を更に備える、請求項1記載のロードロック装置。 - 前記支持手段は、セラミック材、石英、金属及び耐熱性樹脂よりなる群より選択される1以上の材料よりなる、請求項1記載のロードロック装置。
- 前記ロードロック容器内には、前記被処理体を搬送するために屈伸及び旋回が可能になされたロードロック用の搬送機構が設けられる、請求項1記載のロードロック装置。
- 複数枚の被処理体を一度に熱処理することが可能な処理室が連結され、前記被処理体を搬送するための真空搬送機構を内部に含む真空搬送室よりなる真空室と、
内部が大気圧又は大気圧に近い圧力の雰囲気になされ、前記被処理体を搬送するための大気搬送機構が設けられて前記被処理体を大気側との間で搬入又は搬出させる大気搬送室よりなる大気室と、
前記真空室と前記大気室との間に設けられる、請求項1記載のロードロック装置と、
を備える処理システム。 - 複数枚の被処理体を一度に熱処理することが可能な処理室よりなる真空室と、
内部が大気圧又は大気圧に近い圧力の雰囲気になされ、前記被処理体を搬送するための大気搬送機構が設けられて前記被処理体を大気側との間で搬入又は搬出させる大気搬送室よりなる大気室と、
前記真空室と前記大気室との間に設けられる、請求項14記載のロードロック装置と、
を備えたことを特徴とする処理システム。
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CN2010800188932A CN102414809A (zh) | 2009-08-29 | 2010-08-23 | 负载锁定装置和处理系统 |
US13/392,656 US20120170999A1 (en) | 2009-08-29 | 2010-08-23 | Load lock device and processing system |
KR1020127008171A KR20120058592A (ko) | 2009-08-29 | 2010-08-23 | 로드록 장치 및 처리 시스템 |
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CN102414809A (zh) | 2012-04-11 |
KR20120058592A (ko) | 2012-06-07 |
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