JP2010093238A - 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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Abstract
【解決手段】ゲート絶縁層上に、ドレイン電極層またはソース電極層を形成した後、低抵抗な酸化物半導体層をソース領域またはドレイン領域として形成し、その上に半導体層として酸化物半導体膜を形成することを要旨とする。好ましくは、半導体層として酸素過剰酸化物半導体層を用い、ソース領域及びドレイン領域として酸素欠乏酸化物半導体層を用いる。
【選択図】図2
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7を用いて説明する。
本実施の形態では、実施の形態1の薄膜トランジスタにおいてソース領域及びドレイン領域をソース電極層及びドレイン電極層の上下に設ける例である。実施の形態1と異なる構造を有する薄膜トランジスタ及びその作製工程について、図9及び図10を用いて説明する。
本実施の形態では、本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。
本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、本発明の一形態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。
本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23、図24に示す。
本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 (10)
- 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ソース電極層及びドレイン電極層と、前記ソース電極層及び前記ドレイン電極層上にソース領域及びドレイン領域と、前記ゲート絶縁層、前記ソース電極層、前記ドレイン電極層、前記ソース領域及び前記ドレイン領域上に酸化物半導体層とを含む薄膜トランジスタを有し、
前記酸化物半導体層は前記ゲート絶縁層を介して前記ゲート電極層と重なり、前記酸化物半導体層の酸素濃度は前記ソース領域及び前記ドレイン領域の酸素濃度より高いことを特徴とする半導体装置。 - 請求項1において、前記酸化物半導体層、前記ソース領域及び前記ドレイン領域はインジウム、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第1のソース領域及び第1のドレイン領域と、前記第1のソース領域及び前記第1のドレイン領域上にソース電極層及びドレイン電極層と、前記ソース電極層及び前記ドレイン電極層上に第2のソース領域及び第2のドレイン領域と、前記ゲート絶縁層、前記第1のソース領域、前記第1のドレイン領域、前記ソース電極層、前記ドレイン電極層、前記第2のソース領域及び前記第2のドレイン領域上に酸化物半導体層とを含む薄膜トランジスタを有し、
前記酸化物半導体層は前記ゲート絶縁層を介して前記ゲート電極層と重なり、前記酸化物半導体層の酸素濃度は、前記第1のソース領域、前記第1のドレイン領域、前記第2のソース領域、及び前記第2のドレイン領域の酸素濃度より高いことを特徴とする半導体装置。 - 請求項3において、前記酸化物半導体層、前記第1のソース領域、前記第1のドレイン領域、前記第2のソース領域、及び前記第2のドレイン領域はインジウム、ガリウム、及び亜鉛を含む酸化物半導体層である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ソース電極層及びドレイン電極層を形成し、
前記ソース電極層及び前記ドレイン電極層上にソース領域又はドレイン領域を形成し、
前記ゲート絶縁層、前記ソース電極層、前記ドレイン電極層、前記ソース領域、及び前記ドレイン領域にプラズマ処理を行い、
前記ゲート電極層と重なり、かつ前記プラズマ処理されたゲート絶縁層、前記ソース電極層、前記ドレイン電極層、前記ソース領域、及び前記ドレイン領域上に大気に曝さずに酸化物半導体層を形成し、
前記酸化物半導体層の酸素濃度は前記ソース領域及び前記ドレイン領域の酸素濃度より高くすることを特徴とする半導体装置の作製方法。 - 請求項5において、前記酸化物半導体層、前記ソース領域及びドレイン領域を200℃以上600℃以下で加熱することを特徴とする半導体装置の作製方法。
- 請求項5又は請求項6において、前記ゲート絶縁層、前記ソース電極層、前記ドレイン電極層、前記ソース領域、前記ドレイン領域、及び前記酸化物半導体層はスパッタ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。
- 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第1のソース領域及び第1のドレイン領域に形成し、
前記第1のソース領域及び前記第1のドレイン領域上にソース電極層又はドレイン電極層を形成し、
前記ソース電極層及び前記ドレイン電極層上に第2のソース領域又は第2のドレイン領域を形成し、
前記ゲート絶縁層、前記第1のソース領域、前記第1のドレイン領域、前記ソース電極層、前記ドレイン電極層、前記第2のソース領域、及び前記第2のドレイン領域にプラズマ処理を行い、
前記ゲート電極層と重なり、かつ前記プラズマ処理された前記ゲート絶縁層、前記第1のソース領域、前記第1のドレイン領域、前記ソース電極層、前記ドレイン電極層、前記第2のソース領域、及び前記第2のドレイン領域上に大気に曝さずに酸化物半導体層を形成し、
前記酸化物半導体層の酸素濃度は前記第1のソース領域、前記第1のドレイン領域、前記第2のソース領域、及び前記第2のドレイン領域の酸素濃度より高くすることを特徴とする半導体装置の作製方法。 - 請求項8において、前記酸化物半導体層、前記第1のソース領域、前記第1のドレイン領域、前記第2のソース領域、及び前記第2のドレイン領域を200℃以上600℃以下で加熱することを特徴とする半導体装置の作製方法。
- 請求項8又は請求項9において、前記ゲート絶縁層、前記第1のソース領域、前記第1のドレイン領域、前記ソース電極層、前記ドレイン電極層、前記第2のソース領域、前記第2のドレイン領域、及び前記酸化物半導体層はスパッタ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。
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