JP2011233880A - 半導体装置およびその作製方法 - Google Patents
半導体装置およびその作製方法 Download PDFInfo
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- JP2011233880A JP2011233880A JP2011085116A JP2011085116A JP2011233880A JP 2011233880 A JP2011233880 A JP 2011233880A JP 2011085116 A JP2011085116 A JP 2011085116A JP 2011085116 A JP2011085116 A JP 2011085116A JP 2011233880 A JP2011233880 A JP 2011233880A
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Classifications
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- H—ELECTRICITY
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Abstract
【解決手段】酸化物半導体層を有するトランジスタにおいて、ゲート絶縁層を酸化ガリウム膜として、酸化物半導体層と接する構成とする。また、酸化物半導体層の上下を挟むように酸化ガリウム膜を配置することによって信頼性の向上を実現する。また、ゲート絶縁層は、酸化ガリウム膜と酸化ハフニウム膜の積層構造としてもよい。
【選択図】図1
Description
本実施の形態では、本明細書に開示する半導体装置に適用できるトランジスタの例を示す。本明細書に開示する半導体装置に適用できるトランジスタの構造は特に限定されず、例えばゲート電極が、ゲート絶縁層を介して、酸化物半導体層の上側に配置されるトップゲート構造、又はゲート電極が、ゲート絶縁層を介して、酸化物半導体層の下側に配置されるボトムゲート構造のスタガ型及びプレーナ型などを用いることができる。また、トランジスタはチャネル形成領域が一つ形成されるシングルゲート構造でも、二つ形成されるダブルゲート構造もしくは三つ形成されるトリプルゲート構造であっても良い。また、チャネル領域の上下にゲート絶縁層を介して配置された2つのゲート電極を有する、デュアルゲート型でもよい。
図3(A)乃至図3(E)を用いて、図1(C)に示すトランジスタ440の作製工程の一例について説明する。
本実施の形態では、実施の形態2と一部工程が異なるトランジスタの作製例について図4を用いて以下に説明する。実施の形態2のトランジスタとは、酸化物半導体層の下方に設けられる絶縁膜が積層である点、ソース電極およびドレイン電極上に酸化物半導体層が形成される点が主に異なっている。
実施の形態1または実施の形態3で例示したトランジスタを用いて表示機能を有する半導体装置(表示装置ともいう)を作製することができる。また、トランジスタを含む駆動回路の一部または全体を、画素部と同じ基板上に一体形成し、システムオンパネルを形成することができる。
本明細書に開示する半導体装置は、さまざまな電子機器(遊技機も含む)に適用することができる。電子機器としては、例えば、テレビジョン装置(テレビ、またはテレビジョン受信機ともいう)、コンピュータ用などのモニタ、デジタルカメラ、デジタルビデオカメラ等のカメラ、デジタルフォトフレーム、携帯電話機(携帯電話、携帯電話装置ともいう)、携帯型ゲーム機、携帯情報端末、音響再生装置、パチンコ機などの大型ゲーム機などが挙げられる。上記実施の形態で説明した液晶表示装置を具備する電子機器の例について説明する。
202 絶縁膜
204 金属酸化物膜
206 酸化物半導体層
208a ソース電極
208b ドレイン電極
212 ゲート絶縁層
214 ゲート電極
220 トランジスタ
400 基板
401 ゲート電極
402 ゲート絶縁層
403 酸化物半導体層
405a ソース電極
405b ドレイン電極
407 絶縁膜
409 保護絶縁層
410 トランジスタ
420 トランジスタ
430 トランジスタ
436a 配線層
436b 配線層
437 絶縁膜
440 トランジスタ
507a 第1のゲート絶縁層
507b 第2のゲート絶縁層
508 第2のゲート電極
516 第1の絶縁膜
526 第2の絶縁膜
530 酸化物半導体膜
Claims (6)
- ゲート電極と、
金属酸化物膜からなるゲート絶縁層と、
前記ゲート絶縁層と接し、前記ゲート電極と重なる酸化物半導体層と、
前記酸化物半導体層と接するソース電極及びドレイン電極とを有し、
前記金属酸化物膜は酸化ガリウム膜であることを特徴とする半導体装置。 - ゲート電極と、
第1の金属酸化物膜からなるゲート絶縁層と、
前記ゲート絶縁層と接し、前記ゲート電極と重なる酸化物半導体層と、
前記酸化物半導体層と接する第2の金属酸化物膜と、
前記酸化物半導体層と接するソース電極及びドレイン電極とを有し、
前記第1の金属酸化物膜は酸化ガリウム膜であることを特徴とする半導体装置。 - 請求項2において、前記第2の金属酸化物膜は酸化ガリウム膜であることを特徴とする半導体装置。
- 基板上に第1のゲート電極と、
前記第1のゲート電極上に第1の金属酸化物膜からなる第1のゲート絶縁層と、
前記第1のゲート絶縁層上に前記第1のゲート電極と重なる酸化物半導体層と、
前記酸化物半導体層上に接するソース電極及びドレイン電極と、
前記酸化物半導体層、前記ソース電極、及び前記ドレイン電極上に第2の金属酸化物膜からなる第2のゲート絶縁層と、
前記第2のゲート絶縁層上に第2のゲート電極とを有し、
前記第1の金属酸化物膜及び前記第2の金属酸化物膜は酸化ガリウム膜であることを特徴とする半導体装置。 - 基板上に第1の金属酸化物膜と、
前記第1の金属酸化物膜上にソース電極及びドレイン電極と、
前記第1の金属酸化物膜、前記ソース電極、及び前記ドレイン電極上に酸化物半導体層と、
前記酸化物半導体層上に第2の金属酸化物膜からなるゲート絶縁層と、
前記ゲート絶縁層を介して前記酸化物半導体層と重なるゲート電極とを有し、
前記第1の金属酸化物膜及び前記第2の金属酸化物膜は酸化ガリウム膜であることを特徴とする半導体装置。 - 請求項1乃至5のいずれか一において、前記酸化物半導体層は、少なくともガリウムを含むことを特徴とする半導体装置。
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Also Published As
Publication number | Publication date |
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JP6273330B2 (ja) | 2018-01-31 |
US8653514B2 (en) | 2014-02-18 |
US9496416B2 (en) | 2016-11-15 |
JP5992663B2 (ja) | 2016-09-14 |
US20110248261A1 (en) | 2011-10-13 |
US9076877B2 (en) | 2015-07-07 |
JP2017011286A (ja) | 2017-01-12 |
US20140151695A1 (en) | 2014-06-05 |
US20150311352A1 (en) | 2015-10-29 |
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