JP6378908B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6378908B2 JP6378908B2 JP2014054781A JP2014054781A JP6378908B2 JP 6378908 B2 JP6378908 B2 JP 6378908B2 JP 2014054781 A JP2014054781 A JP 2014054781A JP 2014054781 A JP2014054781 A JP 2014054781A JP 6378908 B2 JP6378908 B2 JP 6378908B2
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- electrode
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Classifications
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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
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
-
- 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
- H01L29/7869—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
-
- 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
- H01L29/40—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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Description
本実施の形態では、本発明の一態様の半導体装置の構成例、及び半導体装置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、半導体装置の一例としてトランジスタを例に挙げて説明する。
図1に例示するトランジスタ100の構成例を示す。図1(A)は、トランジスタ100の上面概略図であり、図1(B)、図1(C)はそれぞれ図1(A)中に示す切断線A−B、切断線C−Dにおける断面概略図である。
トランジスタ100のチャネルが形成される半導体層102に適用可能な半導体としては、例えばシリコンやゲルマニウムなどの半導体材料、化合物半導体材料、有機半導体材料、または酸化物半導体材料などが挙げられる。
基板101の材質などに大きな制限はないが、少なくとも工程中の熱処理に耐えうる程度の耐熱性を有する材料を用いる。例えば、ガラス基板、セラミック基板、石英基板、サファイヤ基板、YSZ(イットリア安定化ジルコニア)基板等を、基板101として用いてもよい。また、シリコンや炭化シリコンなどの単結晶半導体基板、多結晶半導体基板、シリコンゲルマニウムなどの化合物半導体基板、SOI基板等を適用することも可能である。
ゲート電極105は、アルミニウム、クロム、銅、タンタル、チタン、モリブデン、タングステンから選ばれた金属、または上述した金属を成分とする合金か、上述した金属を組み合わせた合金等を用いて形成することができる。また、マンガン、ジルコニウムのいずれか一または複数から選択された金属を用いてもよい。また、ゲート電極105は、単層構造でも、二層以上の積層構造としてもよい。例えば、シリコンを含むアルミニウム膜の単層構造、アルミニウム膜上にチタン膜を積層する二層構造、窒化チタン膜上にチタン膜を積層する二層構造、窒化チタン膜上にタングステン膜を積層する二層構造、窒化タンタル膜または窒化タングステン膜上にタングステン膜を積層する二層構造、チタン膜と、そのチタン膜上にアルミニウム膜を積層し、さらにその上にチタン膜を形成する三層構造等がある。また、アルミニウムに、チタン、タンタル、タングステン、モリブデン、クロム、ネオジム、スカンジウムから選ばれた一または複数の金属を組み合わせた合金膜、もしくはこれらの窒化膜を用いてもよい。
絶縁層103は、ゲート絶縁層として機能する。
第1の電極104a及び第2の電極104bは、トランジスタ100のソース電極またはドレイン電極として機能する。
絶縁層106は、基板101に含有される不純物が拡散することを防ぐバリア層として機能する。
以下では、図1で例示したトランジスタ100の作製方法の一例について、図面を参照して説明する。図2乃至図4は、以下で例示する作製方法例での各工程における断面概略図である。
まず、基板101上の絶縁層106を形成する。
続いて、酸化物半導体膜を成膜し、フォトリソグラフィ法などの加工方法を用いて該酸化物半導体膜を島状に加工することで、島状の半導体層102を形成する(図2(A))。
続いて、絶縁層106及び半導体層102上に第1の導電膜115を成膜する(図2(B))。
続いて、絶縁層106、半導体層102、第1の導電層111a、及び第1の導電層111b上に第2の導電膜116を成膜する(図2(D))。
続いて、第2の導電膜116上に、有機塗布膜121を形成する。その後、有機塗布膜121上にレジスト膜122を形成する(図2(E))。
続いて、レジスト膜122を露光する。露光に用いる光は、例えばi線(波長365nm)、g線(波長436nm)、h線(波長405nm)、またはこれらを混合させた光を用い、フォトマスクを介してレジスト膜122に照射することができる。また、液浸露光技術により露光を行ってもよい。また、露光に用いる光として、極端紫外光(EUV:Extreme Ultra−violet)やX線を用いてもよい。また、露光に用いる光に換えて、電子ビームを用いることもできる。極端紫外光、X線または電子ビームを用いると、極めて微細な加工が可能となるため好ましい。なお、電子ビームなどのビームを走査することにより露光を行う場合には、フォトマスクは不要である。
続いて、レジスト膜122をマスクとして、有機塗布膜121及び第2の導電膜116のレジスト膜122に覆われていない部分をエッチングにより除去する(図3(B))。このとき、第2の導電膜116は、半導体層102と重なる領域で離間するように分断される。
続いて、異方性のドライエッチングにより、レジスト膜122、有機塗布膜121、及び第2の導電膜116を、上方から下方にかけて連続的にエッチングする(エッチバックする、ともいう)。このとき、第1の導電層111a及び第1の導電層111bの上面が露出するように、これらの上面に接する第2の導電膜116の一部を除去することにより、第2の導電層112a及び第2の導電層112bが形成される(図3(C))。
続いて、残存している有機塗布膜121を除去する(図3(D))。
続いて、半導体層102、第1の電極104a及び第2の電極104b上に、絶縁層103を形成する(図4(A))。絶縁層103は、第1の導電層111aの上面、第1の導電層111bの上面、第2の導電層112aの上面、第2の導電層112bの上面に接している。
続いて、絶縁層103上に導電膜を成膜し、フォトリソグラフィ法等の加工方法を用いて該導電膜の不要な部分をエッチングすることにより、ゲート電極105を形成する(図4(B))。
続いて、絶縁層103及びゲート電極105上に絶縁層107を形成し、続いて絶縁層107上に絶縁層108を形成する(図4(C))。
続いて、絶縁層108、絶縁層107及び絶縁層103の一部をエッチングし、それぞれ第1の電極104a及び第2の電極104bに達する開口を形成する。
以下では、上記構成例で例示したトランジスタ100と、構成の一部が異なるトランジスタの構成例について説明する。
図5(A)に、以下で例示するトランジスタ150の断面概略図を示す。トランジスタ150は、主に半導体層の構成が異なる点で、トランジスタ100と相違している。
図5(B)に、以下で例示するトランジスタ160の断面概略図を示す。トランジスタ160は、主に半導体層の構成が異なる点で、上記トランジスタ150と相違している。
図5(C)に、以下で例示するトランジスタ170の断面概略図を示す。トランジスタ170は、主に半導体層、ゲート絶縁層などの構成が異なる点で、上記トランジスタ150及びトランジスタ160と相違している。
本実施の形態では、本発明の一態様の半導体装置の半導体層に好適に用いることのできる酸化物半導体について説明する。
本実施の形態では、本発明の一態様の半導体装置を含む表示パネルの構成例について説明する。
図6(A)は、本発明の一態様の表示パネルの上面図であり、図6(B)は、本発明の一態様の表示パネルの画素に液晶素子を適用する場合に用いることができる画素回路を説明するための回路図である。また、図6(C)は、本発明の一態様の表示パネルの画素に有機EL素子を適用する場合に用いることができる画素回路を説明するための回路図である。
また、画素の回路構成の一例を図6(B)に示す。ここでは、VA型液晶表示パネルの画素に適用することができる画素回路を示す。
画素の回路構成の他の一例を図6(C)に示す。ここでは、有機EL素子を用いた表示パネルの画素構造を示す。
本実施の形態では、本発明の一態様の半導体装置を含む電子機器の構成例について説明する。
作製した試料の基板として、シリコンウェハを用いた。基板に対して熱酸化を行い、基板表面上に熱酸化膜を形成した。続いて、熱酸化膜上に厚さ約300nmの酸窒化シリコン膜をプラズマCVD法により形成した後、CMP(Chemical Mechanical Polishing)を用いて表面を平坦化した。
作製した試料について、走査透過電子顕微鏡(STEM:Scanning Transmission Electron Microscope)による断面観察を行った。
101 基板
102 半導体層
103 絶縁層
104a 電極
104b 電極
105 ゲート電極
106 絶縁層
107 絶縁層
108 絶縁層
109a 配線
109b 配線
111a 導電層
111b 導電層
112a 導電層
112b 導電層
115 導電膜
116 導電膜
121 有機塗布膜
122 レジスト膜
132 半導体層
132a 半導体層
132b 半導体層
132c 半導体層
150 トランジスタ
160 トランジスタ
170 トランジスタ
500 基板
501 画素部
502 走査線駆動回路
503 走査線駆動回路
504 信号線駆動回路
510 容量配線
512 ゲート配線
513 ゲート配線
514 ドレイン電極層
516 トランジスタ
517 トランジスタ
518 液晶素子
519 液晶素子
520 画素
521 スイッチング用トランジスタ
522 駆動用トランジスタ
523 容量素子
524 発光素子
525 信号線
526 走査線
527 電源線
528 共通電極
901 RF回路
902 アナログベースバンド回路
903 デジタルベースバンド回路
904 バッテリー
905 電源回路
906 アプリケーションプロセッサ
907 CPU
908 DSP
910 フラッシュメモリ
911 ディスプレイコントローラ
912 メモリ回路
913 ディスプレイ
914 表示部
915 ソースドライバ
916 ゲートドライバ
917 音声回路
918 キーボード
919 タッチセンサ
1001 本体
1002 筐体
1003a 表示部
1003b 表示部
1004 キーボードボタン
1021 本体
1022 固定部
1023 表示部
1024 操作ボタン
1025 外部メモリスロット
1030 筐体
1031 筐体
1032 表示パネル
1033 スピーカー
1034 マイクロフォン
1035 操作キー
1036 ポインティングデバイス
1037 カメラ用レンズ
1038 外部接続端子
1040 太陽電池セル
1041 外部メモリスロット
1050 テレビジョン装置
1051 筐体
1052 記憶媒体再生録画部
1053 表示部
1054 外部接続端子
1055 スタンド
1056 外部メモリ
Claims (3)
- 絶縁表面上に島状の第1の半導体層と、
前記第1の半導体層上に接して設けられ、前記第1の半導体層上で離間する第1の電極及び第2の電極と、
前記第1の半導体層上のゲート電極と、
前記第1の半導体層と前記ゲート電極との間のゲート絶縁層と、
前記第1の電極と前記ゲート絶縁層との間に位置する第1の領域と、前記第2の電極と前記ゲート絶縁層との間に位置する第2の領域と、前記第1の領域と前記第2の領域とに挟まれ且つ前記第1の半導体層に接する第3の領域とを有する第2の半導体層と、を有し、
前記第1の電極及び前記第2の電極は、それぞれ第1の導電層及び第2の導電層を有し、
前記第2の導電層は、前記第1の導電層の側面に接し、
前記第2の導電層の膜厚は、前記第1の導電層の膜厚よりも小さく、
前記第1の半導体層と前記第2の半導体層とは、それぞれ酸化物半導体を含む、
半導体装置。 - 絶縁表面上に島状の第1の半導体層と、
前記第1の半導体層上に接して設けられ、前記第1の半導体層上で離間する第1の電極及び第2の電極と、
前記第1の半導体層上のゲート電極と、
前記第1の半導体層と前記ゲート電極との間のゲート絶縁層と、
前記第1の電極と前記ゲート絶縁層との間に位置する第1の領域と、前記第2の電極と前記ゲート絶縁層との間に位置する第2の領域と、前記第1の領域と前記第2の領域とに挟まれ且つ前記第1の半導体層に接する第3の領域とを有する第2の半導体層と、を有し、
前記第1の電極及び前記第2の電極は、それぞれ第1の導電層及び第2の導電層を有し、
前記第2の導電層は、前記第1の導電層の側面に接し、
前記第2の導電層の膜厚は、前記第1の導電層の膜厚よりも小さく、
前記第1の半導体層と前記第2の半導体層とは、それぞれ酸化物半導体を含み、
前記ゲート電極の端部と、前記ゲート絶縁層の端部と、前記第2の半導体層の端部とは、一致している、
半導体装置。 - 請求項1又は請求項2において、
前記第2の導電層は、前記第1の導電層の周囲を囲うように設けられる、半導体装置。
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US10347769B2 (en) | 2019-07-09 |
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US20140284595A1 (en) | 2014-09-25 |
KR20140116814A (ko) | 2014-10-06 |
KR102166892B1 (ko) | 2020-10-16 |
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