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CN106409929B - Main-grid-free full back contact solar cell module - Google Patents

Main-grid-free full back contact solar cell module Download PDF

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Publication number
CN106409929B
CN106409929B CN201610877970.9A CN201610877970A CN106409929B CN 106409929 B CN106409929 B CN 106409929B CN 201610877970 A CN201610877970 A CN 201610877970A CN 106409929 B CN106409929 B CN 106409929B
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China
Prior art keywords
grid
back contact
contact solar
doped region
positive
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CN201610877970.9A
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CN106409929A (en
Inventor
蒋秀林
陈孝业
段光亮
尹海鹏
单伟
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Jingao Yangzhou New Energy Co ltd
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JA Solar Technology Yangzhou Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022441Electrode arrangements specially adapted for back-contact solar cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/05Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0516Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar cells
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses a main grid-free full back contact solar cell module, which comprises a plurality of back contact solar cells connected in series, wherein each back contact solar cell is formed by cutting back contact solar cells; because a plurality of battery units are cut, the current of each battery piece group string is reduced, and the influence of the resistance loss of the thin grid line is reduced, so that the consumption of silver paste can be reduced, and the filling factors of the battery and the assembly are improved; based on the two points, the battery pack can improve the efficiency of the full back contact battery pack and reduce the process difficulty and the manufacturing cost of the full back contact battery pack.

Description

A kind of full back contact solar cell component of no main grid
Technical field
The invention belongs to area of solar cell, and in particular to a kind of no full back contact solar cell component of main grid.
Background technique
Solar battery is a kind of semiconductor devices for converting light energy into electric energy, lower production cost and higher energy Amount transformation efficiency is always the target that solar cell industry is pursued.For current conventional solar battery, positive electrode contact Electrode and negative electrode contact electrode are located at the tow sides of cell piece.The front of battery is light-receiving surface, front metal positive electricity The covering of pole contact electrode will cause the sunlight of a part of incidence to be reflected by metal electrode, and a part of optics is caused to damage It loses.The area coverage of the front metal electrode of common crystal silicon solar batteries reduces the front covering of metal electrode 7% or so The energy conversion efficiency for the battery that can directly improve.
Full back contact solar cell be it is a kind of by positive electrode and negative electrode contact electrode be both placed in cell backside (it is non-by Smooth surface) battery, the light-receiving surface of the battery is blocked without any metal electrode, to effectively increase the short circuit current of cell piece, It is improved the energy conversion efficiency of cell piece.
The solar battery of full back contact structure is energy in the crystal silicon solar batteries of current energy industrialized mass production A kind of highest battery of transformation efficiency, its high transformation efficiency, low component package cost are deep always to be favored by people.? In previous full back contact solar cell manufacture craft, it is real that metallization process mostly uses the complex plating of process Existing, this method has outstanding performance in the series resistance for reducing back contact battery, the open-circuit voltage for improving battery really, but should Method and process is complicated, and the waste of discharge seriously pollutes environment, and with the mainstream method for metallising of current industrialized production not phase It is compatible therefore larger for the industrialization promotion difficulty of low cost.
If carrying out the metallization of back contact battery using conventional main gate line using the screen printing technique of current mainstream Two main problems faced when design are (1): between main gate line and the thin grid line of opposite electrode and main gate line and opposite electrode Insulation between corresponding doped region.(2) because full back contact battery electric current is significantly higher than conventional batteries, in order to reduce main grid Power loss caused by line resistance on line and thin grid line is needed using wider grid line, and more slurry consumptions bring cost It steeply rises.
A kind of solution solves between main gate line and the thin grid line of opposite electrode and main gate line and the corresponding doping of opposite electrode The method of insulation between region is the corresponding region printing insulating layer slurry of positive electrode main grid, only positive-electrode fine on silicon wafer Grid line and the region peripheral part p+ are not blocked.Likewise, printing insulating layer slurry in the corresponding region of negative electrode main grid, only The superfine grid line of negative electricity and the region peripheral part n+ are not blocked.The method of this printing insulation paste must have enough thickness, Otherwise it is easy to that tip breakdown occurs.It cannot pass through high-temperature process, existing sintering process after printing additionally, due to this slurry It is incompatible with its.The price of above disadvantage and insulation paste valuableness causes the method for printing insulating layer slurry not advised greatly The use of mould.
Another method solves between main gate line and the thin grid line of opposite electrode and main gate line and opposite electrode is corresponding mixes Insulation between miscellaneous region is that positive and negative electrode is designed using rich font, and the superfine grid line of negative electricity avoids positive electrode main gate line, positive electrode Thin grid line avoids negative electrode main gate line.The X-Y scheme of positive and negative electrode in this way does not have staggered place, can solve reverse leakage Problem.But the drawbacks of this method, is that the corresponding electronics in relationship positive electrode main grid position due to lateral transport distance is difficult to It is collected by negative electrode, the corresponding hole in negative electrode main grid position is difficult to be collected by positive electrode.In this way, leading to the fill factor of battery And incident photon-to-electron conversion efficiency is a greater impact.
Summary of the invention
The purpose of the present invention is to provide a kind of no full back contact solar cell components of main grid, this is without the full back contacts of main grid Solar cell module avoids full back contact battery setting main gate line bring loss in efficiency and process complexity and saves Main gate line cost;Simultaneously because cut multiple battery units, the electric current of every a string of cell pieces group string is reduced, to reduce The influence of thin grid line line resistance loss, therefore can reduce the consumption of silver paste, at the same improve the filling of battery and component because Son;Based on the above two o'clock, which can not only promote the efficiency of full back contact battery component but also can reduce its technique hardly possible Degree and manufacturing cost.
Above-mentioned purpose of the invention is achieved through the following technical solutions: a kind of no full back contact solar electricity of main grid Pond component, including multiple back contact solar baby battery pieces being connected in series, the back contact solar baby battery piece is by back contacts Solar battery sheet is cut, and the back contact solar baby battery piece includes n-type silicon matrix, the back of the n-type silicon matrix Face, which is equipped with, to be parallel to each other and alternately arranged p+ doped region and n+ doped region, the p+ doped region and n+ doped region It is equipped with passivation layer, the passivation layer is equipped with positive-electrode fine grid, and it is corresponding that the positive-electrode fine grid are located at the p+ doped region It is in contact on position and with the p+ doped region, the superfine grid of negative electricity, the superfine grid position of negative electricity is additionally provided on the passivation layer It is in contact on the n+ doped region corresponding position and with the n+ doped region, the positive-electrode fine grid and the negative electrode Thin grid are parallel to each other and are arranged alternately, and the both ends of the positive-electrode fine grid and the both ends of the superfine grid of the negative electricity are misaligned, wherein One end of the positive-electrode fine grid has jag, the other end phase of the positive-electrode fine grid relative to one end of the superfine grid of negative electricity The other end of grid superfine for negative electricity have shorten end, one end of the superfine grid of negative electricity relative to the positive-electrode fine grid one End, which has, shortens end, and the other end of the superfine grid of negative electricity has jag, phase relative to the other end of the positive-electrode fine grid It, will a wherein back contact solar baby battery using conductive tape or welding when adjacent two back contact solar baby battery pieces are connected in series The jag of the thin grid of piece is connected with the jag of the opposite polarity thin grid of adjacent back contacts day sun energy baby battery piece, described The electric current of positive-electrode fine grid and the superfine grid of the negative electricity is exported along the direction of the positive-electrode fine grid and the superfine grid of the negative electricity.
Further, the side of conductive tape or welding of the present invention and a wherein back contact solar baby battery piece The jag of thin grid is in contact, the polarity of the other side of the conductive tape or welding and adjacent back contact solar baby battery piece The jag of opposite thin grid is in contact.
Back contact solar baby battery piece of the present invention is cut by back contact solar cell piece, the back after cutting The structure of contact solar baby battery piece is similar to full back contact battery (IBC), and difference is that this back contact solar is small Cell piece does not have main gate line, only thin grid line.Because the positive and negative superfine grid line of back contact solar baby battery piece is along thin grid line There is a relative dislocation in direction, and in this way along thin grid line direction, one end is that positive-electrode fine grid line is prominent, and the other end is negative electrode Thin grid line is prominent.After battery completes, conductive tape or welding are connected to the jag of the thin grid line of cell piece i.e. The series connection between cell piece junior unit can be achieved.Specific mode is that the side of conductive tape or welding is connected to certain piece battery The positive-electrode fine grid line of piece, the other side are connected to the superfine grid line of negative electricity of adjacent a piece of cell piece.
It is further preferred that the shape of conductive tape of the present invention and welding is strip, width is 0.2~6mm.
When adjacent two back contact solars baby battery piece is connected in series, wherein the thin grid of a back contact solar baby battery piece The spacing shortened between end for shortening the opposite polarity thin grid of end and adjacent back contact solar baby battery piece is 0.4~6mm.
In other words, each positive and negative superfine grid line of back contact solar baby battery piece is having a phase along thin grid line direction Facilitate the series connection of further battery piece junior unit to dislocation, the front and back of back contact solar baby battery piece is without main grid Line.
The contracting of conductive tape or welding of the present invention and the wherein positive-electrode fine grid of a back contact solar baby battery piece Short end and p+ doped region insulation, the negative electrode of the conductive tape or welding and adjacent back contact solar baby battery piece The shortening end of thin grid and the n+ doped region also insulate.
As a preferred embodiment of the present invention, the conductive tape or welding and a wherein back contact solar The corresponding position that the silicon substrate of the shortening end side of the positive-electrode fine grid of baby battery piece is in contact is equipped with p+ doped region, described On p+ doped region at the conductive tape or welding opposite position be equipped with passivation insulation, the conductive tape or welding The corresponding position being in contact with the silicon substrate of the shortening end side of the superfine grid of negative electricity of adjacent back contact solar baby battery piece Equipped with n+ doped region, on the n+ doped region with also be provided at the conducting resinl or welding opposite position passivation insulation Layer.
It designs in this way, convenient for making conductive tape or welding of the present invention and a wherein back contact solar baby battery piece The shortening end of positive-electrode fine grid and the p+ doped region are not in contact, the conductive tape or welding and the adjacent back contacts sun The shortening end of the superfine grid of negative electricity of energy baby battery piece and the n+ doped region are not also in contact.Prevent the generation of electric leakage.
As another preferred embodiment of the invention, conductive tape or welding of the present invention connect with wherein one back It is adulterated equipped with n+ the corresponding position that the silicon substrate of the shortening end side of the positive-electrode fine grid of touching solar energy baby battery piece is in contact The silicon of the shortening end side of the superfine grid of negative electricity of region, the conductive tape or welding and adjacent back contact solar baby battery piece The corresponding position that matrix is in contact is equipped with p+ doped region.
Conductive tape of the present invention is preferably the conductive particle of binder package, and the binder is preferably epoxy resin Conducting resinl, phenolic resin conducting resinl, conductive polyurethane glue, thermoplastic resins conductive glue or polyimides conducting resinl etc., it is described to lead Electric particle is preferably the particles such as silver, gold, copper or alloying metal;The welding is preferably the copper bar for welding coating package, the weldering The material for connecing coating is preferably tin, leypewter, sn-bi alloy or tin-lead silver alloy.
The width of the positive-electrode fine grid and the superfine grid of the negative electricity is 20~300 μm.
The back contact solar cell piece is cut into 2~20 back contact solar baby battery pieces.
The thin grid knot at the settable multiple back contact solar baby battery piece back sides of back contact solar cell on piece of the present invention Structure forms the back contact solar baby battery piece of above structure, can wherein will press a back contact solar baby battery piece after cutting According to original structural arrangement, adjacent back contact solar baby battery piece rotates 180 °, wherein a back contact solar baby battery piece The jag of the opposite polarity thin grid of the jag and adjacent back contact solar baby battery piece of thin grid using conductive tape or Welding connection, can form series winding cell piece.
N-type silicon matrix of the present invention is preferably first handled through surface wool manufacturing using preceding, then using diffusion, laser boring, The technical combinations such as ion implanting & annealing, exposure mask, etching in the silicon substrate back surface p+ doped region that is arranged alternately with each other of production and N+ doped region, and the n+FSF of low surface dopant concentration is made in silicon substrate body front surface.
Antireflective overlayer passivation film passivation n+FSF, such as Al are also deposited in front surface of the present invention2O3/ SiNx, SiO2/ SiNx, SiO2/Al2O3/SiNxDeng further preferred SiO2/ SiNx is as front passivating film, film thickness 60-200nm.
Backside deposition increase reflective stacks passivating film, that is, passivation layer to n+, P+ doped region carry out subregion passivation or it is blunt simultaneously Change, overlayer passivation film can choose Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/SiON etc., further preferred SiO2/ Al2O3For/SiNx as backside passivation film, film thickness is preferably 45-600nm.
After the completion of the preparation of every a string of batteries, module encapsulation techniques and the general components system such as subsequent confluence, lamination, lamination It is no different as mode.
Compared with prior art, the invention has the following advantages:
(1) current direction is along thin grid bearing on each battery pack string in the present invention, different from conventional setting Main gate line bring loss in efficiency is arranged so as to avoid full back contact battery in the construction of one main gate line perpendicular to thin grid line With process complexity and saved main gate line cost;
(2) it since the cutting of back contact solar cell piece forms multiple back contact solar baby battery pieces, reduces every The electric current of a string of cell piece group strings to reduce the influence of thin grid line line resistance loss, therefore can substantially reduce silver paste Consumption, while improving the fill factor of battery and component;
(3) it is based on the above two o'clock, battery component of the present invention can not only promote the efficiency of full back contact battery component but also can be with Reduce its technology difficulty and manufacturing cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram without the full back contact solar cell of main grid in embodiment 1;
Fig. 2 is in embodiment 1 without the structural schematic diagram after the full back contact solar cell laser cutting of main grid;
Fig. 3 is in embodiment 1 without the complete postrotational schematic diagram of back contact solar cell cutter unit of main grid;
Fig. 4 is the interconnection schematic diagram without the full back contact solar cell of main grid in embodiment 1;
Fig. 5 is the group string schematic diagram in embodiment 1 without the full back contact solar cell of main grid;
Fig. 6 is the structural schematic diagram without the full back contact solar cell of main grid in embodiment 2;
Fig. 7 is in embodiment 2 without the structural schematic diagram after the full back contact solar cell laser cutting of main grid;
1 is n-type silicon matrix, and 2 be n+FSF, and 3 be p+ doped region, and 4 be n+ doped region, and 5 be battery front side passivating film, 6 It is positive-electrode fine grid line for cell backside passivating film, 81,811 be the jag of positive-electrode fine grid, and 812 be the contracting of positive-electrode fine grid Short end, 82 be the thin grid line of negative electrode, and 821 be the jag of the thin grid of negative electrode, and 822 be the shortening end of the thin grid of negative electrode, and 9 be conduction Adhesive tape or welding.
Specific embodiment
Embodiment 1
As shown in Figs. 1-5, the full back contact solar cell component of no main grid provided in this embodiment, including multiple be connected in series Back contact solar baby battery piece, back contact solar baby battery piece cuts by back contact solar cell piece, and back connects Touching solar energy baby battery piece includes n-type silicon matrix 1, and the back side of n-type silicon matrix 1, which is equipped with, to be parallel to each other and alternately arranged p+ mixes Miscellaneous region 3 and n+ doped region 4, p+ doped region 3 and n+ doped region 4 are equipped with passivation layer 6, and passivation layer 6 is equipped with positive electricity Superfine grid 81, positive-electrode fine grid 81 are located on 3 corresponding position of p+ doped region and are in contact with p+ doped region 3, on passivation layer 6 The superfine grid 82 of negative electricity are additionally provided with, the superfine grid 82 of negative electricity are located on 4 corresponding position of n+ doped region and connect with n+ doped region 4 Touching, positive-electrode fine grid 81 and the superfine grid 82 of negative electricity are parallel to each other and are arranged alternately, and the both ends of positive-electrode fine grid 81 and negative electricity are superfine The both ends of grid 82 are misaligned, and wherein one end of positive-electrode fine grid 81 has jag 811 relative to one end of the superfine grid 82 of negative electricity, The other end of positive-electrode fine grid 81 has relative to the other end of the superfine grid 82 of negative electricity shortens end 812, and the one of the superfine grid 82 of negative electricity It holds one end relative to positive-electrode fine grid 81 to have and shortens end 822, the other end of the superfine grid 82 of negative electricity is relative to positive-electrode fine grid 81 other end have jag 821, when adjacent two back contact solars baby battery piece is connected in series, using conductive tape 9 by its In a back contact solar baby battery piece the superfine grid 82 of negative electricity jag 821 and adjacent back contacts day sun energy baby battery piece The jags 811 of positive-electrode fine grid 81 connect, the electric current of positive-electrode fine grid 81 and the superfine grid 82 of negative electricity is along positive-electrode fine grid 81 and the superfine grid 82 of negative electricity direction export.
The wherein jag of the side of conductive tape 9 and the wherein superfine grid 82 of negative electricity of a back contact solar baby battery piece 821 are in contact and (connect), the positive-electrode fine grid 81 of the other side of conductive tape 9 and adjacent back contact solar baby battery piece Jag 811 is in contact and (connects).
The shape of conductive tape 9 is strip, and width is 0.2~6mm.
Conductive tape is the conductive particle of binder package, and binder is epoxide resin conductive adhesive, and conductive particle is silver.
When adjacent two back contact solars baby battery piece is connected in series, wherein the positive electrode of a back contact solar baby battery piece Between between the shortening end 822 of the superfine grid 82 of negative electricity for shortening end 812 and adjacent back contact solar baby battery piece of thin grid 81 Away from for 0.4~6mm.
The shortening end of conductive tape 9 and the wherein positive-electrode fine grid 81 of a back contact solar baby battery piece in the present embodiment The insulation of 812 and p+ doped region 3 is not in contact, and conductive tape 9 and the negative electricity of adjacent back contact solar baby battery piece are superfine The shortening end 822 of grid 82 and n+ doped region 4, which also insulate, not to be in contact.
Be accomplished by the following way and above-mentioned do not contact in the present embodiment: conductive tape 9 and a wherein back contact solar are small The corresponding position that the silicon substrate of 812 side of shortening end of the positive-electrode fine grid 81 of cell piece is in contact is equipped with p+ doped region, p On+doped region at 9 opposite position of conductive tape or welding be equipped with passivation layer, use thicker (200~2000nm) Passivating film 6 realizes the insulation of conductive tape Yu the region p+ n+, conductive tape 9 and adjacent back contact solar baby battery piece The corresponding positions that are in contact of silicon substrate of 822 side of shortening end of the superfine grid 82 of negative electricity be equipped with n+ doped region, n+ doping On region with also be provided with passivation insulation at 9 opposite position of conducting resinl, passivation insulation, that is, backside passivation film 6 realizes that p+ mixes The insulation in miscellaneous region and n+ doped region.
The width of positive-electrode fine grid 81 and the superfine grid 82 of negative electricity is 20~300 μm.
The quantity of back contact solar baby battery piece is 2, as shown in Figs. 1-3.
The thin grid at the settable multiple back contact solar baby battery piece back sides of the present embodiment back contact solar cell on piece Structure forms the back contact solar baby battery piece of above structure, will wherein press a back contact solar baby battery piece after cutting According to original structural arrangement, adjacent back contact solar baby battery piece rotates 180 °, as shown in Fig. 2, a wherein back contact solar The jag of the positive-electrode fine grid 81 of the jag of the superfine grid of the negative electricity of baby battery piece and adjacent back contact solar baby battery piece It is connected using conductive tape, forms series winding cell piece, as illustrated in figures 4-5.
The n-type silicon matrix of back contact solar cell piece is first handled through surface wool manufacturing using preceding, then utilizes diffusion, laser The p+ doping that the technical combinations such as punching, ion implanting & annealing, exposure mask, etching are arranged alternately with each other in the production of silicon substrate back surface Region and n+ doped region, and the n+FSF of low surface dopant concentration is made in silicon substrate body front surface.
Antireflective overlayer passivation film passivation n+FSF, such as Al are also deposited in front surface of the present invention2O3/ SiNx, SiO2/ SiNx, SiO2/Al2O3/SiNxDeng further preferred SiO2/ SiNx is as front passivating film, film thickness 60-200nm.
Backside deposition increases your passivation layer of reflective stacks passivating film and carries out subregion passivation or blunt simultaneously to n+, P+ doped region Change, overlayer passivation film can choose Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/SiON etc., further preferred SiO2/ Al2O3For/SiNx as backside passivation film, film thickness is preferably 45-600nm.
After the completion of the preparation of every a string of batteries, module encapsulation techniques and the general components system such as subsequent confluence, lamination, lamination It is no different as mode.
The above-mentioned full back contact solar cell component of no main grid the preparation method is as follows:
(1) N-shaped single crystal silicon substrate 1 is selected, resistivity is 1~30 Ω cm, with a thickness of 50~300 μm, the silicon substrate It is first handled through surface wool manufacturing using preceding, then utilizes the technology groups such as diffusion, laser boring, ion implanting & annealing, exposure mask, etching It closes and makes the p+ doped region 3 and n+ doped region 4 being arranged alternately with each other in silicon substrate back surface, made in silicon substrate body front surface The n+FSF 2 of low surface dopant concentration.
(2) front surface deposition antireflective overlayer passivation film 5 is passivated n+FSF, such as Al2O3/ SiNx, SiO2/ SiNx, SiO2/ Al2O3/ SiNx etc., selects SiO here2/ SiNx is as front passivating film, and film thickness is 60~200nm, and it is folded that rear surface deposition increases reflection Layer passivating film 6 is carried out subregion passivation to n+ doped region, P+ doped region or is passivated simultaneously, and overlayer passivation film can choose Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/ SiON etc., selects SiO here2/Al2O3/ SiNx as backside passivation film, Film thickness is 45~600nm.
(3) positive electrode contact point is made on p+ doped region 3, and negative electrode contact point is made on n+ doped region 4, is connect Contact can republish in such a way that printing silver paste directly burns backside passivation film or using first laser opening or electricity The mode of plating metal contacts dot shape without limitation, single contact point face to form the Ohmic contact of contact point and silicon substrate Product is 100 μm2~30000 μm2
(4) it anneals or is sintered so that contact point and silicon substrate form good Ohmic contact and solidify thin grid line, Electric current is exported in n+ doped region and p+ doped region surface printing thin grid line connection electrode contact point, the width of thin grid line is 20~300 μm, the thin grid of battery plus-negative plate are interdigitated arrangement.
(5) above-mentioned back contact solar cell piece is cut, forms the back contact solar of above structure after cutting Baby battery piece, one end of the positive-electrode fine grid of back contact solar baby battery piece has relative to one end of the superfine grid of negative electricity to be protruded The length at end, jag is 0.2~3mm, and the other end of the positive-electrode fine grid of back contact solar baby battery piece is relative to negative electricity The other end of superfine grid, which has, shortens end.
(6) after battery completes, electricity can be realized in the jag that conductive tape is connected to the thin grid line of cell piece Series connection between the piece junior unit of pond, specific mode are that the side of conductive tape or welding is connected to the positive electricity of certain piece cell piece Superfine grid line, the other side are connected to the superfine grid line of negative electricity of adjacent a piece of cell piece.
(7) after the completion of every a string of batteries preparation, module encapsulation techniques and the general components such as subsequent confluence, lamination, lamination Production method is similar.
Embodiment 2
Unlike the first embodiment:
As shown in fig. 6-7, using welding by the jag of the wherein superfine grid of negative electricity of a back contact solar baby battery piece It connects with the jag of the positive-electrode fine grid of adjacent back contacts day sun energy baby battery piece, positive-electrode fine grid and the superfine grid of negative electricity Electric current is exported along the direction of positive-electrode fine grid and the superfine grid of negative electricity.
Welding connects with the silicon substrate of the shortening end side of the wherein positive-electrode fine grid of a back contact solar baby battery piece The corresponding position of touching is equipped with n+ doped region, the shortening of welding and the superfine grid of negative electricity of adjacent back contact solar baby battery piece The corresponding position that the silicon substrate of end side is in contact is equipped with p+ doped region.
Accordingly even when being sent out using the general backside passivation film of insulation performance without worry welding and following doped region The problem of raw electric leakage, the thickness of backside passivation film can lower significantly, without making back particularly with superior insulation effect Face passivating film.
Although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention, such as is led The material of electric adhesive tape or welding can also be the other materials that Summary is enumerated, and herein be only to enumerate, and be not construed as limiting, The graphic structure of thin grid can also carry out exchange adjustment, such as the position of p+ doped region and n+ doped region can be exchanged, Back contact solar cell piece, can also be cut by the position of adjustment the positive-electrode fine grid and the superfine grid of negative electricity of adaptability simultaneously 2 or more, preferably 2~20, back contact solar cell on piece p+ doped region, p+ doped region, positive-electrode fine grid and Baby battery piece after cutting can be combined by the structure of the superfine grid of negative electricity, any to be familiar with those skilled in the art, In made change and retouching without departing from the spirit and scope of the invention, it is within the scope of protection of the invention.

Claims (10)

1. a kind of full back contact solar cell component of no main grid, it is characterized in that: including multiple back contact solars being connected in series Baby battery piece, the back contact solar baby battery piece are cut by back contact solar cell piece, the back contacts sun Can baby battery piece include n-type silicon matrix, the back side of the n-type silicon matrix, which is equipped with, to be parallel to each other and alternately arranged p+ doped region Domain and n+ doped region, the p+ doped region and n+ doped region are equipped with passivation layer, and the passivation layer is equipped with positive electrode Thin grid, the positive-electrode fine grid are located on the p+ doped region corresponding position and are in contact with the p+ doped region, described Be additionally provided with the superfine grid of negative electricity on passivation layer, the superfine grid of negative electricity be located on the n+ doped region corresponding position and with the n+ Doped region is in contact, and the positive-electrode fine grid and the superfine grid of the negative electricity are parallel to each other and are arranged alternately, the positive-electrode fine The both ends of grid and the both ends of the superfine grid of the negative electricity are misaligned, wherein one end of the positive-electrode fine grid is relative to the superfine grid of negative electricity One end there is jag, the other ends of the positive-electrode fine grid has relative to the other end of the superfine grid of negative electricity shortens end, institute The one end for stating the superfine grid of negative electricity has relative to one end of the positive-electrode fine grid shortens end, the other end of the superfine grid of negative electricity There is the other end relative to the positive-electrode fine grid jag to adopt when adjacent two back contact solars baby battery piece is connected in series With conductive tape or welding by the wherein jag of the thin grid of a back contact solar baby battery piece and the adjacent back contacts sun The jag series connection of the opposite polarity thin grid of energy baby battery piece, the electric current edge of the positive-electrode fine grid and the superfine grid of the negative electricity The direction export of the positive-electrode fine grid and the superfine grid of the negative electricity.
2. the full back contact solar cell component of no main grid according to claim 1, it is characterized in that: the conductive tape or The side of welding is in contact with the jag of the wherein thin grid of a back contact solar baby battery piece, the conductive tape or welding The other side be in contact with the jag of the opposite polarity thin grid of adjacent back contact solar baby battery piece.
3. the full back contact solar cell component of no main grid according to claim 2, it is characterized in that: the conductive tape and The shape of welding is strip, and width is 0.2~6mm.
4. the full back contact solar cell component of no main grid according to claim 3, it is characterized in that: adjacent two back contacts are too When positive energy baby battery piece is connected in series, wherein the shortening end of the thin grid of a back contact solar baby battery piece and the adjacent back contacts sun The spacing of the opposite polarity thin grid of energy baby battery piece shortened between end is 0.4~6mm.
5. the full back contact solar cell component of no main grid according to claim 1-4, it is characterized in that: described lead Electric adhesive tape or welding and wherein the shortening end of the positive-electrode fine grid of a back contact solar baby battery piece and the p+ doped region The shortening end of the superfine grid of negative electricity of insulation, the conductive tape or welding and adjacent back contact solar baby battery piece and the n+ Doped region also insulate.
6. the full back contact solar cell component of no main grid according to claim 5, it is characterized in that: the conductive tape or Welding is in contact corresponding with the silicon substrate of the shortening end side of the wherein positive-electrode fine grid of a back contact solar baby battery piece P+ doped region is equipped at position, on the p+ doped region with passivation is equipped at the conductive tape or welding opposite position The shortening end side of the superfine grid of negative electricity of insulating layer, the conductive tape or welding and adjacent back contact solar baby battery piece The corresponding position that silicon substrate is in contact is equipped with n+ doped region, opposite with the conducting resinl or welding on the n+ doped region It answers and also is provided with passivation insulation at position.
7. the full back contact solar cell component of no main grid according to claim 5, it is characterized in that: the conductive tape or Welding is in contact corresponding with the silicon substrate of the shortening end side of the wherein positive-electrode fine grid of a back contact solar baby battery piece N+ doped region, the superfine grid of negative electricity of the conductive tape or welding and adjacent back contact solar baby battery piece are equipped at position The corresponding position that is in contact of silicon substrate of shortening end side be equipped with p+ doped region.
8. the full back contact solar cell component of no main grid according to claim 1-4, it is characterized in that: described lead Electric adhesive tape is the conductive particle of binder package, and the binder is epoxide resin conductive adhesive, phenolic resin conducting resinl, polyurethane Conducting resinl, thermoplastic resins conductive glue or polyimides conducting resinl, the conductive particle are silver, gold, copper or alloying metal particle; The welding is the copper bar for welding coating package, and the material of the welding coating is tin, leypewter, sn-bi alloy or tin-lead silver Alloy.
9. the full back contact solar cell component of no main grid according to claim 1-4, it is characterized in that: it is described just The width of the thin grid of electrode and the superfine grid of the negative electricity is 20~300 μm.
10. the full back contact solar cell component of no main grid according to claim 1-4, it is characterized in that: described Back contact solar cell piece is cut into 2~20 back contact solar baby battery pieces.
CN201610877970.9A 2016-09-30 2016-09-30 Main-grid-free full back contact solar cell module Active CN106409929B (en)

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