JP6559444B2 - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP6559444B2 JP6559444B2 JP2015048963A JP2015048963A JP6559444B2 JP 6559444 B2 JP6559444 B2 JP 6559444B2 JP 2015048963 A JP2015048963 A JP 2015048963A JP 2015048963 A JP2015048963 A JP 2015048963A JP 6559444 B2 JP6559444 B2 JP 6559444B2
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- transistor
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Classifications
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66969—Multistep manufacturing processes of devices having semiconductor bodies not comprising group 14 or group 13/15 materials
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- H—ELECTRICITY
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02321—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer
- H01L21/02323—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of oxygen
- H01L21/02326—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of oxygen into a nitride layer, e.g. changing SiN to SiON
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- H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
- H01L21/0234—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour treatment by exposure to a plasma
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/4908—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET for thin film semiconductor, e.g. gate of TFT
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/4966—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET the conductor material next to the insulator being a composite material, e.g. organic material, TiN, MoSi2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
- H01L29/78621—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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- H01L29/772—Field effect transistors
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Thin Film Transistor (AREA)
- Electrodes Of Semiconductors (AREA)
Description
本実施の形態では、半導体装置および半導体装置の作製方法の一形態を、図1乃至図4を用いて説明する。
図1(A)乃至図1(D)に、半導体装置に含まれるトランジスタの一例として、トップゲート・セルフアライン構造のトランジスタの断面図を示す。
次に、図1(A)に示すトランジスタの作製方法について、図3および図4を用いて説明する。
本実施の形態では、実施の形態1に示す半導体装置の構造及び作製方法と異なる形態を、図5乃至図9を用いて説明する。
半導体装置が有するトランジスタの構造について、図5(A)乃至(D)を用いて説明する。
半導体装置が有するトランジスタの構造について、図6(A)乃至(D)を用いて説明する。
次に、図5(A)に示すトランジスタの作製方法について、図7および図8を用いて説明する。
次に、図6(A)に示すトランジスタの作製方法について、図7及び図9を用いて説明する。
本実施の形態では、実施の形態1及び実施の形態2に示す半導体装置の構造及び作製方法と異なる一形態を、図3、図7、図10乃至図13を用いて説明する。
半導体装置が有するトランジスタの構造について、図10(A)乃至(D)を用いて説明する。
半導体装置が有するトランジスタの構造について、図11(A)乃至(D)を用いて説明する。
半導体装置が有するトランジスタの構造について、図12(A)乃至(D)を用いて説明する。
次に、図10(A)に示すトランジスタの作製方法について、図3および図13を用いて説明する。
次に、図11(A)に示すトランジスタの作製方法について、図7(A)乃至(D)および図8(A)(B)を用いて説明する。
次に、図12(A)に示すトランジスタの作製方法について、図7(A)乃至(D)および図9(A)を用いて説明する。
実施の形態1乃至実施の形態3において、絶縁膜53に過剰な酸素を添加する方法を、図14を用いて説明する。
本実施の形態では、実施の形態1乃至実施の形態4に適用可能な構成を有するトランジスタおよびトランジスタの作製方法の一形態を、図15乃至図18を用いて説明する。ここでは、実施の形態1を用いて説明する。
図15に、半導体装置に含まれるトランジスタの一例として、トップゲート・セルフアライン構造のトランジスタの断面図を示す。本実施の形態に示すトランジスタは、実施の形態1に示すトランジスタと比較して、ゲート絶縁膜が積層構造である点が異なる。
次に、図15(A)に示すトランジスタの作製方法について、図16および図17を用いて説明する。
絶縁膜57および緩衝膜60の形成方法の変形例を説明する。
本実施の形態では、酸化物半導体膜55に含まれる第2の領域55b、55cが、酸素欠損及び水素を有することで、抵抗率が低減することについて説明する。具体的には、酸化物半導体膜55に含まれる第2の領域55b、55cに形成されるVoHについて説明する。なお、ここでは、酸素欠損Vo中に水素原子Hがある状態をVoHと表記する。
酸化物半導体膜(以下、IGZOと示す。)が結晶の場合、室温では、Hは、優先的にab面に沿って拡散する。また、450℃の加熱処理の際には、Hは、ab面およびc軸方向それぞれに拡散する。そこで、ここでは、IGZOに酸素欠損Voが存在する場合、Hは酸素欠損Vo中に入りやすいか否かについて説明する。
IGZO中において酸素欠損VoとHが存在する場合、<(1). VoHの形成しやすさおよび安定性>で示した、NEB法を用いた計算より、酸素欠損VoとHはVoHを形成しやすく、さらにVoHは安定であると考えられる。そこで、VoHがキャリアトラップに関与するかを調べるため、VoHの遷移レベルの算出を行った。
ここで、酸化物導電体で形成される膜(以下、酸化物導電体膜という。)における、抵抗率の温度依存性について、図25を用いて説明する。
実施の形態1乃至実施の形態6に適用可能なゲート電極の構成について、図26を用いて説明する。
本実施の形態では、先に示す実施の形態に適用可能な酸化物半導体膜の構造について、図27を用いて説明する。なお、ここでは、実施の形態1に示すトランジスタを用いて説明するが、適宜先に示す実施の形態に示すトランジスタに本実施の形態を適用することが可能である。
次に、本実施の形態に示すトランジスタの代表例として、図28(A)に示すトランジスタの任意断面におけるバンド構造について説明する。なお、図28(A)に示す破線で囲まれた領域71aの拡大図を図28(B)に示し、破線で囲まれた領域71bの拡大図を図28(C)に示し、破線で囲まれた領域71cの拡大図を図28(D)に示す。即ち、図28(A)に示すトランジスタは、第1の領域55a、第2の領域55b、55cを有する酸化物半導体膜55を有する。また、図28(B)に示すように、第1の領域55aは、第1の領域55_2aおよび第1の領域55_3aが、絶縁膜53および絶縁膜57の間に設けられる。また、図28(C)に示すように、第2の領域55bは、第2の領域55_2bおよび第2の領域55_3bが、絶縁膜53および水素を有する絶縁膜65の間に設けられる。また、図28(D)に示すように、第2の領域55cは、第2の領域55_2cおよび第2の領域55_3cが、絶縁膜53および水素を有する絶縁膜65の間に設けられる。
本実施の形態では、先に示す実施の形態に適用可能なトランジスタの構造について、図29を用いて説明する。なお、ここでは、実施の形態1に示すトランジスタを用いて説明するが、適宜先に示す実施の形態に示すトランジスタに本実施の形態を適用することが可能である。図29(A)は、トランジスタのチャネル長方向における断面図であり、図29(B)は、トランジスタのチャネル幅方向における断面図である。
本実施の形態では、先に示す実施の形態に適用可能な酸化物半導体の詳細について、以下説明する。
以下では、酸化物半導体の構造について説明する。
まずは、CAAC−OSについて説明する。
次に、nc−OSについて説明する。
a−like OSは、nc−OSと非晶質酸化物半導体との間の構造を有する酸化物半導体である。
本実施の形態では、本発明の一態様の入出力装置の構成について、図35および図36を参照しながら説明する。なお、入出力装置はタッチパネルということもできる。
本実施の形態で説明する入出力装置500は、可視光を透過する窓部14を具備し且つマトリクス状に配設される複数の検知ユニット10U、行方向(図中に矢印Rで示す)に配置される複数の検知ユニット10Uと電気的に接続する走査線G1、列方向(図中に矢印Cで示す)に配置される複数の検知ユニット10Uと電気的に接続する信号線DLならびに、検知ユニット10U、走査線G1および信号線DLを支持する可撓性の基材16を備える可撓性の入力装置100と、窓部14に重なり且つマトリクス状に配設される複数の画素502および画素502を支持する可撓性の第2の基材510を備える表示部501と、を有する(図35(A)乃至図35(C)参照)。
入出力装置500は、入力装置100と、表示部501と、を備える(図35(A)参照)。
入力装置100は複数の検知ユニット10Uおよび検知ユニットを支持する可撓性の基材16を備える。例えば、40行15列のマトリクス状に複数の検知ユニット10Uを可撓性の基材16に配設する。
窓部14は可視光を透過する。
検知素子Cは、第1の電極11、第2の電極12および第1の電極11と第2の電極12の間に絶縁膜13を有する(図36(A)参照)。
検知回路19は例えばトランジスタM1乃至トランジスタM3を含む。また、検知回路19は電源電位および信号を供給する配線を含む。例えば、信号線DL、配線VPI、配線CS、走査線G1、配線RES、配線VRESなどを含む。なお、検知回路19の具体的な構成は実施の形態12で詳細に説明する。
有機材料、無機材料または有機材料と無機材料の複合材料を可撓性の基材16に用いることができる。
可撓性の保護基材17または/および保護膜17pを備えることができる。可撓性の保護基材17または保護膜17pは傷の発生を防いで入力装置100を保護する。
表示部501は、マトリクス状に配置された複数の画素502を備える(図35(C)参照)。
可撓性を有する材料を基材510に用いることができる。例えば、基材16に用いることができる材料を基材510に適用することができる。
封止材560は基材16と基材510を貼り合わせる。封止材560は空気より大きい屈折率を備える。また、封止材560側に光を取り出す場合は、封止材560は封止材560と接する層との屈折率段差を低減することができる。
副画素502Rは発光モジュール580Rを備える。
画素回路に含まれるトランジスタ502tを覆う絶縁膜521を備える。絶縁膜521は画素回路に起因する凹凸を平坦化するための膜として用いることができる。また、不純物の拡散を抑制できる層を含む積層膜を、絶縁膜521に適用することができる。これにより、不純物の拡散によるトランジスタ502t等の信頼性の低下を抑制できる。
走査線駆動回路503g(1)は、トランジスタ503tおよび容量503cを含む。なお、画素回路と同一の工程で同一基板上に形成することができるトランジスタを駆動回路に用いることができる。
検知ユニット10Uが供給する検知信号DATAを変換してフレキシブル基板FPC1に供給することができるさまざまな回路を、変換器CONVに用いることができる(図35(A)および図36(A)参照)。
表示部501は、反射防止膜567pを画素に重なる位置に備える。反射防止膜567pとして、例えば円偏光板を用いることができる。
様々なトランジスタを表示部501に適用できる。
本実施の形態では、本発明の一態様の入出力装置の検知ユニットに用いることができる検知回路の構成および駆動方法について、図37を参照しながら説明する。
検知回路19の駆動方法について説明する。
第1のステップにおいて、第3のトランジスタを導通状態にした後に非導通状態にするリセット信号をゲートに供給し、検知素子Cの第1の電極の電位を所定の電位にする(図37(B−1)期間T1参照)。
第2のステップにおいて、第2のトランジスタM2を導通状態にする選択信号をゲートに供給し、第1のトランジスタの第2の電極を信号線DLに電気的に接続する。
第3のステップにおいて、制御信号を検知素子の第2の電極に供給し、制御信号および検知素子Cの容量に基づいて変化する電位を第1のトランジスタM1のゲートに供給する。
第4のステップにおいて、第1のトランジスタM1のゲートの電位の変化がもたらす信号を信号線DLに供給する。
第5のステップにおいて、第2のトランジスタを非導通状態にする選択信号をゲートに供給する。
本実施の形態では、本発明の一態様の半導体装置を用いることができる電子機器について、図38を用いて説明を行う。
11 電極
12 電極
13 絶縁膜
14 窓部
16 基材
16a バリア膜
16b 基材
16c 樹脂膜
17 保護基材
17p 保護膜
19 検知回路
51 基板
53 絶縁膜
53a 絶縁膜
54 酸化物半導体膜
55 酸化物半導体膜
55_1 酸化物半導体膜
55_2 酸化物半導体膜
55_2a 領域
55_2b 領域
55_2c 領域
55_3 酸化物半導体膜
55_3a 領域
55_3b 領域
55_3c 領域
55a 領域
55b 領域
55c 領域
55d 領域
55e 領域
56 絶縁膜
57 絶縁膜
58 緩衝膜
58a 緩衝膜
59 緩衝膜
60 緩衝膜
60a 緩衝膜
61 導電膜
61a 導電膜
61b 導電膜
62 酸素
63 不純物元素
64 絶縁膜
65 絶縁膜
67 絶縁膜
68 導電膜
69 導電膜
71 領域
71a 領域
71b 領域
71c 領域
73 ゲート電極
77 導電膜
79 絶縁膜
81 緩衝膜
82 酸素
83 緩衝膜
100 入力装置
500 入出力装置
501 表示部
502 画素
502B 副画素
502G 副画素
502R 副画素
502t トランジスタ
503c 容量
503g 走査線駆動回路
503t トランジスタ
510 基材
510a バリア膜
510b 基材
510c 樹脂膜
511 配線
519 端子
521 絶縁膜
528 隔壁
550R 発光素子
560 封止材
567p 反射防止膜
580R 発光モジュール
600 筐体
601 表示部
602 表示部
603 スピーカ
604 LEDランプ
605 操作キー
606 接続端子
607 センサ
608 マイクロフォン
609 スイッチ
610 携帯情報端末
612 表示部
613 ヒンジ
615 筐体
620 赤外線ポート
621 記録媒体読込部
627 充電器
5100 ペレット
5120 基板
5161 領域
Claims (1)
- 酸化物半導体膜上に絶縁膜を形成し、
前記絶縁膜上に緩衝膜を形成し、
前記緩衝膜及び前記絶縁膜に酸素を添加し、
前記酸素が添加された緩衝膜上に導電膜を形成し、
前記酸素が添加された絶縁膜及び前記酸素が添加された緩衝膜をエッチングして、前記酸化物半導体膜の一部を露出させ、
前記エッチングされた緩衝膜は、断面視において、L長方向の長さが前記導電膜より小さく、
前記導電膜をマスクとして、前記酸化物半導体膜に不純物元素を添加し、
前記酸化物半導体膜と重なる絶縁膜を形成する、半導体装置の作製方法。
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US11094804B2 (en) | 2021-08-17 |
US20150263141A1 (en) | 2015-09-17 |
JP2019186573A (ja) | 2019-10-24 |
JP6530546B2 (ja) | 2019-06-12 |
US10361290B2 (en) | 2019-07-23 |
US20190326420A1 (en) | 2019-10-24 |
US20240213356A1 (en) | 2024-06-27 |
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JP2018201051A (ja) | 2018-12-20 |
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US20220013657A1 (en) | 2022-01-13 |
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