JP2010056542A - 半導体装置及び半導体装置の作製方法 - Google Patents
半導体装置及び半導体装置の作製方法 Download PDFInfo
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- JP2010056542A JP2010056542A JP2009176611A JP2009176611A JP2010056542A JP 2010056542 A JP2010056542 A JP 2010056542A JP 2009176611 A JP2009176611 A JP 2009176611A JP 2009176611 A JP2009176611 A JP 2009176611A JP 2010056542 A JP2010056542 A JP 2010056542A
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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Abstract
【解決手段】半導体層としてIn、Ga、及びZnを含む酸化物半導体膜を用い、半導体層とソース電極層及びドレイン電極層との間にバッファ層が設けられた逆スタガ型(ボトムゲート構造)の薄膜トランジスタを含むことを要旨とする。ソース電極層及びドレイン電極層と半導体層との間に、半導体層よりもキャリア濃度の高いバッファ層を意図的に設けることによってオーミック性のコンタクトを形成する。
【選択図】図1
Description
本実施の形態では、薄膜トランジスタ及びその作製工程について、図1乃至図4を用いて説明する。
本実施の形態は、マルチゲート構造の薄膜トランジスタの例である。従って、他は実施の形態1と同様に行うことができ、実施の形態1と同一部分又は同様な機能を有する部分、及び工程の繰り返しの説明は省略する。
本実施の形態は、薄膜トランジスタにおいてバッファ層を積層する例である。従って、他は実施の形態1又は実施の形態2と同様に行うことができ、実施の形態1又は実施の形態2と同一部分又は同様な機能を有する部分、及び工程の繰り返しの説明は省略する。
本実施の形態は、実施の形態1において、薄膜トランジスタの形状及び作製方法が一部異なる例である。従って、他は実施の形態1と同様に行うことができ、実施の形態1と同一部分又は同様な機能を有する部分、及び工程の繰り返しの説明は省略する。
本実施の形態では、本明細書で開示する発明の半導体装置の一例である表示装置において、同一基板上に少なくとも駆動回路の一部と、画素部に配置する薄膜トランジスタを作製する例について以下に説明する。
ここでは、少なくともゲート絶縁層と酸化物半導体層の積層を大気に触れることなく、連続成膜を行う逆スタガ型の薄膜トランジスタの作製例を以下に示す。ここでは、連続成膜を行う工程までの工程を示し、その後の工程は、実施の形態1乃至実施の形態4のいずれか一に従って薄膜トランジスタを作製すればよい。
本明細書で開示する発明の薄膜トランジスタを作製し、該薄膜トランジスタを画素部、さらには駆動回路に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、本明細書で開示する発明の薄膜トランジスタを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。
本実施の形態では、本明細書で開示する発明の半導体装置として電子ペーパーの例を示す。
本実施の形態では、本明細書で開示する発明の半導体装置として発光表示装置の例を示す。表示装置の有する表示素子としては、ここではエレクトロルミネッセンスを利用する発光素子を用いて示す。エレクトロルミネッセンスを利用する発光素子は、発光材料が有機化合物であるか、無機化合物であるかによって区別され、一般的に、前者は有機EL素子、後者は無機EL素子と呼ばれている。
次に、半導体装置の一形態である表示パネルの構成について、以下に示す。本実施の形態では、表示素子として液晶素子を有する液晶表示装置の一形態である液晶表示パネル(液晶パネルともいう)、表示素子として発光素子を有する半導体装置の一形態である発光表示パネル(発光パネルともいう)について説明する。
本明細書で開示する発明の半導体装置は、電子ペーパーとして適用することができる。電子ペーパーは、情報を表示するものであればあらゆる分野の電子機器に用いることが可能である。例えば、電子ペーパーを用いて、電子書籍(電子ブック)、ポスター、電車などの乗り物の車内広告、クレジットカード等の各種カードにおける表示等に適用することができる。電子機器の一例を図28、図29に示す。
本明細書で開示する発明に係る半導体装置は、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、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。
Claims (13)
- ゲート電極層と、前記ゲート電極層上にゲート絶縁層と、前記ゲート絶縁層上に半導体層と、前記半導体層上にn型の導電型を有するバッファ層と、前記バッファ層上にソース電極層及びドレイン電極層とを含む薄膜トランジスタを有し、
前記半導体層及び前記バッファ層はインジウム、ガリウム、及び亜鉛を含む酸化物半導体層であり、
前記バッファ層のキャリア濃度は、前記半導体層のキャリア濃度より高く、
前記半導体層と前記ソース電極層及び前記ドレイン電極層とは前記バッファ層を介して電気的に接続することを特徴とする半導体装置。 - ゲート電極層と、前記ゲート電極層上にゲート絶縁層と、前記ゲート絶縁層上に半導体層と、前記半導体層上にn型の導電型を有するバッファ層と、前記バッファ層上にソース電極層及びドレイン電極層とを含む薄膜トランジスタを有し、
前記半導体層及び前記バッファ層はインジウム、ガリウム、及び亜鉛を含む酸化物半導体層であり、
前記半導体層は前記ソース電極層と前記ドレイン電極層との間に膜厚の薄い領域を含み、
前記バッファ層のキャリア濃度は、前記半導体層のキャリア濃度より高く、
前記半導体層と前記ソース電極層及び前記ドレイン電極層とは前記バッファ層を介して電気的に接続することを特徴とする半導体装置。 - 請求項1又は請求項2において、前記バッファ層はn型を付与する不純物元素を含むことを特徴とする半導体装置。
- 請求項1乃至3のいずれか一項において、前記半導体層のキャリア濃度は1×1017atoms/cm3未満であり、前記バッファ層のキャリア濃度は1×1018atoms/cm3以上であることを特徴とする半導体装置。
- 請求項1乃至4のいずれか一項において、前記半導体層と前記バッファ層との間にキャリア濃度が前記半導体層より高く、前記バッファ層より低い第2のバッファ層を有することを特徴とする半導体装置。
- 請求項1乃至4のいずれか一項において、前記ソース電極層及び前記ドレイン電極層はチタンを含むことを特徴とする半導体装置。
- 基板上にゲート電極層を形成し、
前記ゲート電極層上にゲート絶縁層を形成し、
前記ゲート絶縁層上に半導体層を形成し、
前記半導体層上にn型の導電型を有するバッファ層を形成し、
前記バッファ層上にソース電極層及びドレイン電極層を形成し、
前記半導体層及び前記バッファ層はインジウム、ガリウム、及び亜鉛を含む酸化物半導体層を用いて形成し、
前記バッファ層のキャリア濃度は、前記半導体層のキャリア濃度より高く、
前記半導体層と前記ソース電極層及び前記ドレイン電極層とは前記バッファ層を介して電気的に接続することを特徴とする半導体装置の作製方法。 - 基板上にゲート電極層を形成し、
前記ゲート電極層上にゲート絶縁層を形成し、
前記ゲート絶縁層上に半導体層を形成し、
前記半導体層上にn型の導電型を有するバッファ層を形成し、
前記バッファ層上にソース電極層及びドレイン電極層を形成し、
前記半導体層及び前記バッファ層はインジウム、ガリウム、及び亜鉛を含む酸化物半導体層を用いて形成し、
前記バッファ層のキャリア濃度は、前記半導体層のキャリア濃度より高く、
前記半導体層と前記ソース電極層及び前記ドレイン電極層とは前記バッファ層を介して電気的に接続し、
前記ゲート絶縁層、前記半導体層、前記バッファ層、前記ソース電極層、及び前記ドレイン電極層は大気に曝さずに連続的に形成することを特徴とする半導体装置の作製方法。 - 請求項7又は請求項8において、前記ゲート絶縁層、前記半導体層、前記バッファ層、前記ソース電極層、及び前記ドレイン電極層はスパッタリング法によって形成することを特徴とする半導体装置の作製方法。
- 請求項9において、前記ゲート絶縁層、及び前記半導体層は酸素雰囲気下で形成することを特徴とする半導体装置の作製方法。
- 請求項9又は請求項10において、バッファ層は希ガス雰囲気下で形成することを特徴とする半導体装置の作製方法。
- 請求項7乃至11のいずれか一項において、前記半導体層のキャリア濃度は1×1017atoms/cm3未満とし、前記バッファ層のキャリア濃度は1×1018atoms/cm3以上とすることを特徴とする半導体装置の作製方法。
- 請求項7乃至12のいずれか一項において、前記バッファ層にマグネシウム、アルミニウム、又はチタンを含んで形成することを特徴とする半導体装置の作製方法。
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