JP6285703B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6285703B2 JP6285703B2 JP2013248900A JP2013248900A JP6285703B2 JP 6285703 B2 JP6285703 B2 JP 6285703B2 JP 2013248900 A JP2013248900 A JP 2013248900A JP 2013248900 A JP2013248900 A JP 2013248900A JP 6285703 B2 JP6285703 B2 JP 6285703B2
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- layer
- oxide
- oxide semiconductor
- insulating layer
- transistor
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- 229920002647 polyamide Polymers 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 238000001552 radio frequency sputter deposition Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Images
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. 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
- H01L29/7869—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
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/24—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only semiconductor materials not provided for in groups H01L29/16, H01L29/18, H01L29/20, H01L29/22
- H01L29/247—Amorphous materials
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41733—Source or drain electrodes for field effect devices for thin film transistors with insulated gate
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- 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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- 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
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- 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
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- 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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- H01L29/76—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
- H01L29/78636—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 with supplementary region or layer for improving the flatness of the device
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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
- 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
- H01L29/78696—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel
Description
本実施の形態では、本発明の一態様の半導体装置に含有される積層構造について、図11を用いて説明する。
酸化物積層404のバンド構造を説明する。バンド構造の解析は、第1の酸化物層404a及び第2の酸化物層404cに相当する層としてエネルギーギャップが3.15eVであるIn−Ga−Zn酸化物、酸化物半導体層404bに相当する層としてエネルギーギャップが2.8eVであるIn−Ga−Zn酸化物を用い、酸化物積層404に相当する積層を作製して行っている。なお、便宜的に当該積層を酸化物積層、当該積層を構成するそれぞれの層を第1の酸化物層、酸化物半導体層、第2の酸化物層と称して説明する。
多層構造を構成する各酸化物層は、少なくともインジウム(In)を含み、スパッタリング法好ましくはDCスパッタリング法で成膜することのできるスパッタリングターゲットを用いて成膜する。スパッタリングターゲットにインジウムを含ませることで導電性が高まるため、DCスパッタリング法で成膜することを容易なものとする。
CAAC−OS膜は、例えば、多結晶である酸化物半導体スパッタリング用ターゲットを用い、スパッタリング法によって成膜する。当該スパッタリング用ターゲットにイオンが衝突すると、スパッタリング用ターゲットに含まれる結晶領域がa−b面から劈開し、a−b面に平行な面を有する平板状またはペレット状のスパッタリング粒子として剥離することがある。この場合、当該平板状のスパッタリング粒子が、結晶状態を維持したまま基板に到達することで、CAAC−OS膜を成膜することができる。
本実施の形態では、実施の形態1で例示した積層構造を含む半導体装置、及び半導体装置の作製方法の例を、図面を参照して説明する。本実施の形態では、半導体装置の一例として、酸化物半導体層を有するトップゲート型のトランジスタを示す。
図1にトランジスタ100の構成例を示す。図1(A)は、トランジスタ100の上面から見た概略図であり、図1(B)は、図1(A)中の切断線A−Bにおける断面概略図であり、図1(C)は、図1(A)中の切断線C−Dにおける断面概略図である。
基板101は、単なる支持基板に限らず、他のトランジスタなどのデバイスが形成された基板であってもよい。この場合、トランジスタ100のゲート電極、ソース電極、又はドレイン電極の少なくとも一つは、上記他のデバイスと電気的に接続されていてもよい。
絶縁層103は、基板101からの不純物の拡散を防止する役割を有するほか、酸化物積層104に酸素を供給する役割を担うため、酸素を含む絶縁層を用いるものとする。また、上述のように基板101が他のデバイスが形成された基板である場合、絶縁層103は層間絶縁層としての機能も有する。その場合は、表面が平坦になるようにCMP(Chemical Mechanical Polishing)法等で平坦化処理を行うことが好ましい。
酸化物積層104の上方に接して設けられたゲート絶縁層105からも酸化物積層104へ酸素が供給されうる。
トランジスタ100において、電極層108及び電極層109上に設けられる絶縁層112として、ゲート絶縁層105よりも酸素に対する透過性が低い(酸素に対するバリア性を有する、ともいえる)絶縁層を用いる。例えば、ゲート絶縁層105、または絶縁層107よりも酸素に対する透過性が低い絶縁層を用いる。絶縁層112の一部はゲート絶縁層105や酸化物積層104を覆うため、このような酸素に対する透過性が低い材料を用いることで、酸化物積層104からの酸素の脱離を抑制することができる。その結果として、チャネル形成領域の酸素欠損を抑制することができる。例えば絶縁層112として、窒化シリコンまたは窒化酸化シリコン、酸化アルミニウム等を用いることができる。
酸化物積層104は、少なくともチャネルを形成する酸化物半導体層104bと、酸化物半導体層104bと絶縁層103との間に設けられた第1の酸化物層104aと、酸化物半導体層104bとゲート絶縁層105との間に設けられた第2の酸化物層104cとを含んで構成される。
酸化物層106は、少なくとも酸化物半導体層104bの側面に接して設けられる。好ましくは、酸化物層106は第1の酸化物層104aの側面、及び酸化物半導体層104bの側面に接して設ける。
トランジスタ100において、ソース電極又はドレイン電極として機能する電極層108は、電極層108a、電極層108b、及び電極層108cを含んで構成される。電極層108aは、絶縁層107、酸化物層106、及び酸化物半導体層104bの上面に接して設けられる。また電極層108b及び電極層108cの積層体は、電極層108aのチャネル側の端部を越えて酸化物半導体層104bの上面に接して設けられる。
電極層109は、電極層109aと電極層109bとが積層された構成を有する。なお、電極層109は、3以上の導電層の積層体としてもよい。
トランジスタ100を形成する工程において、工程を増やすことなく容量素子を形成することもできる。
以下では、上記で例示したトランジスタの作製方法の一例について、図面を参照して説明する。
以下では、上記で例示したトランジスタの作製方法の例とは一部が異なる例について説明する。特に本変形例で例示する作製方法例では、上記トランジスタの作製方法例における絶縁層107の形成工程までの工程について説明する。
以下では、上記とは一部が異なるトランジスタの作製方法例について説明する。特に本変形例で例示する作製方法例では、変形例1と同様に、上記トランジスタの作製方法例における絶縁層107の形成工程までの工程について説明する。
本実施の形態では、上記実施の形態で説明したトランジスタを用いた、本発明の一態様である半導体装置について図面を用いて説明する。
図15(A)に本実施の形態で説明する半導体装置400の回路図を示す。半導体装置400は、上記実施の形態で説明したトランジスタ100と、容量素子150と、トランジスタ401とを有する。
本発明の一態様である半導体装置は、上記実施の形態で説明したトランジスタ100を用いていればよく、トランジスタ100の下層はトランジスタ401に限られるものではない。そこで、以下に、本発明の一態様である半導体装置であって、半導体装置400とは構造が一部異なる半導体装置について説明する。
以下に、本発明の一態様である半導体装置であって、半導体装置400及び半導体装置450とは構造が一部異なる半導体装置について説明する。
上記実施の形態で説明した半導体装置は、さまざまな電子機器に搭載されるマイクロコンピュータに適用することができる。
101 基板
102 低抵抗領域
103 絶縁層
104 酸化物積層
104a 酸化物層
104b 酸化物半導体層
104c 酸化物層
105 ゲート絶縁層
106 酸化物層
107 絶縁層
108 電極層
108a 電極層
108b 電極層
108c 電極層
108d 電極層
109 電極層
109a 電極層
109b 電極層
111 絶縁層
112 絶縁層
150 容量素子
154 酸化物層
155 絶縁層
158b 電極層
158c 電極層
159a 電極層
159b 電極層
161 レジストマスク
166 酸化物層
171 バリア層
400 半導体装置
401 トランジスタ
402 絶縁層
403 基板
404 酸化物積層
404a 酸化物層
404b 酸化物半導体層
404c 酸化物層
405 チャネル形成領域
407 不純物領域
409 高濃度不純物領域
410 ゲート絶縁層
411 ゲート絶縁層
413 ゲート電極層
415 サイドウォール絶縁層
416 電極層
417 素子分離絶縁層
419 絶縁層
421 層間絶縁層
423 配線層
425 層間絶縁層
427 配線層
429 層間絶縁層
431 電極層
433 絶縁層
435 絶縁層
437 層間絶縁層
439 電極層
441 配線層
447 電極層
450 半導体装置
451 トランジスタ
452 CMOS回路
453 nウェル
454 チャネル形成領域
456 不純物領域
458 高濃度不純物領域
460 ゲート絶縁層
462 ゲート電極層
464 サイドウォール絶縁層
466 電極層
480 半導体装置
481 トランジスタ
482 チャネル形成領域
483 不純物領域
484 ゲート絶縁層
485 ゲート電極層
486 絶縁層
487 ゲート電極層
488 サイドウォール絶縁層
489 電極層
500 マイクロコンピュータ
501 直流電源
502 バスライン
503 パワーゲートコントローラ
504 パワーゲート
505 CPU
506 揮発性記憶部
507 不揮発性記憶部
508 インターフェース
509 検出部
511 光センサ
512 アンプ
513 ADコンバータ
530 発光素子
1141 スイッチング素子
1142 メモリセル
1143 メモリセル群
1189 ROMインターフェース
1190 基板
1191 ALU
1192 ALUコントローラ
1193 インストラクションデコーダ
1194 インタラプトコントローラ
1195 タイミングコントローラ
1196 レジスタ
1197 レジスタコントローラ
1198 バスインターフェース
1199 ROM
8100 警報装置
8101 マイクロコンピュータ
8200 室内機
8201 筐体
8202 送風口
8203 CPU
8204 室外機
8300 電気冷凍冷蔵庫
8301 筐体
8302 冷蔵室用扉
8303 冷凍室用扉
8304 CPU
9700 電気自動車
9701 二次電池
9702 制御回路
9703 駆動装置
9704 処理装置
Claims (4)
- 絶縁表面上に設けられた島状の酸化物半導体層と、
前記酸化物半導体層の側面を囲う絶縁層と、
前記酸化物半導体層の上面、及び前記絶縁層の上面と接するソース電極層及びドレイン電極層と、
前記酸化物半導体層と重ねて設けられたゲート電極層と、
前記酸化物半導体層と前記ゲート電極層との間に設けられたゲート絶縁層と、を有し、
前記ソース電極層、前記ドレイン電極層は、前記酸化物半導体層の上面よりも上側に設けられ、
前記絶縁層の上面は、平坦化処理が施されており、
前記ソース電極層は、第1のソース電極層と第2のソース電極層とが順に積層され、
前記ドレイン電極層は、第1のドレイン電極層と第2のドレイン電極層とが順に積層され、
前記第1のソース電極層及び前記第1のドレイン電極層は、前記酸化物半導体層の上面、及び前記絶縁層の上面と接して設けられ、
前記第2のソース電極層及び前記第2のドレイン電極層は、前記酸化物半導体層の上面と接して設けられる半導体装置。 - 請求項1において
前記酸化物半導体層と前記絶縁層との間に酸化物層を有し、
前記酸化物層は、前記酸化物半導体層の側面に接して設けられる半導体装置。 - 請求項1または請求項2において、
前記酸化物半導体層の下面に接して設けられる第1の酸化物層を有し、
前記絶縁層は、前記第1の酸化物層の側面を囲って設けられる半導体装置。 - 請求項1乃至請求項3のいずれか一において、
前記酸化物半導体層の上面、前記ソース電極層の上面、及び前記ドレイン電極層の上面に接する、第2の酸化物層を有する半導体装置。
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US20160163872A1 (en) | 2016-06-09 |
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US9570625B2 (en) | 2017-02-14 |
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