JP2011129895A - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP2011129895A JP2011129895A JP2010255472A JP2010255472A JP2011129895A JP 2011129895 A JP2011129895 A JP 2011129895A JP 2010255472 A JP2010255472 A JP 2010255472A JP 2010255472 A JP2010255472 A JP 2010255472A JP 2011129895 A JP2011129895 A JP 2011129895A
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- layer
- oxide semiconductor
- insulating layer
- oxygen
- thin film
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Abstract
【解決手段】酸化物半導体層に対して、窒素、または希ガス(アルゴン、ヘリウムなど)の不活性気体雰囲気下、或いは減圧下で脱水化、又は脱水素化処理のための加熱処理を行い、酸素、酸素及び窒素、又は大気(好ましくは露点−40℃以下、より好ましくは−50℃以下)雰囲気下で加酸化処理のための冷却工程を行うことで高純度化及びI型化した酸化物半導体層を形成する。該酸化物半導体層を含む薄膜トランジスタを有する半導体装置を作製する。
【選択図】図1
Description
半導体装置及び半導体装置の作製方法を図1及び図2を用いて説明する。
半導体装置及び半導体装置の作製方法を図8及び図9を用いて説明する。実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
本実施の形態では、チャネルストップ型の薄膜トランジスタの一例について図34(A)、図34(B)及び図34(C)を用いて説明する。また、図34(C)は薄膜トランジスタの上面図の一例であり、図中Z1―Z2の鎖線で切断した断面図が図34(B)に相当する。実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
薄膜トランジスタを含む半導体装置の作製工程について、図10乃至図13を用いて説明する。
本実施の形態では、半導体装置の作製方法の他の例を説明する。
本実施の形態では、半導体装置の作製方法の他の例を説明する。
本実施の形態では、実施の形態1と一部工程が異なる一例を示す。本実施の形態は、ソース電極層405a、ドレイン電極層405bの形成後に脱水化、又は脱水素化の加熱処理を行う例を図31に示す。なお、図1と同一の部分には同じ符号を用いて説明する。
半導体装置及び半導体装置の作製方法を、図32を用いて説明する。実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
半導体装置及び半導体装置の作製方法を、図33を用いて説明する。実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
半導体装置及び半導体装置の作製方法を、図35(A)及び図35(B)を用いて説明する。実施の形態3と同一部分または同様な機能を有する部分、及び工程は、実施の形態3と同様に行うことができ、繰り返しの説明は省略する。
本実施の形態では、実施の形態1と構造が一部異なる例を図36に示す。実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
本実施の形態では、断面から見て酸化物半導体層を窒化物絶縁層で囲む例を図23に示す。図23は、実施の形態1に示す薄膜トランジスタと酸化物絶縁層の上面形状及び端部の位置が異なる点、ゲート絶縁層の構成が異なる点以外は同じであるため、実施の形態1と同一部分または同様な機能を有する部分、及び工程は、実施の形態1と同様に行うことができ、繰り返しの説明は省略する。
本実施の形態では、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。
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、薄膜トランジスタを用いて、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。
半導体装置として電子ペーパーの例を示す。
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。
本明細書に開示する半導体装置は、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26、図27に示す。
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、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 (7)
- ゲート電極層及び該ゲート電極層を覆うゲート絶縁層を形成した後、前記ゲート電極層及び前記ゲート絶縁層を減圧状態に保持された処理室に導入し、
前記処理室内の残留水分を除去しつつ水素及び水分が除去されたスパッタガスを導入し、前記処理室内に装着された金属酸化物のターゲットを用いて前記ゲート絶縁層上に酸化物半導体層を形成し、
前記酸化物半導体層を窒素、又は希ガス雰囲気下での加熱処理により脱水化または脱水素化した後、酸素雰囲気下での冷却処理により酸素を供給し、
前記脱水化または脱水素化させ、かつ酸素を供給した酸化物半導体層上にソース電極層及びドレイン電極層を形成し、
前記ゲート絶縁層、前記酸化物半導体層、前記ソース電極層、及び前記ドレイン電極層上にスパッタリング法により絶縁層を形成することを
特徴とする半導体装置の作製方法。 - ゲート電極層及び該ゲート電極層を覆うゲート絶縁層を形成した後、前記ゲート電極層及び前記ゲート絶縁層を減圧状態に保持された処理室に導入し、
前記処理室内の残留水分を除去しつつ水素及び水分が除去されたスパッタガスを導入し、前記処理室内に装着された金属酸化物のターゲットを用いて前記ゲート絶縁層上に酸化物半導体層を形成し、
前記酸化物半導体層を窒素、又は希ガス雰囲気下での加熱処理により脱水化または脱水素化した後、酸素及び窒素、又は露点−40℃以下の大気雰囲気下での冷却処理により酸素を供給し、
前記脱水化または脱水素化させ、かつ酸素を供給した酸化物半導体層上にソース電極層及びドレイン電極層を形成し、
前記ゲート絶縁層、前記酸化物半導体層、前記ソース電極層、及び前記ドレイン電極層上にスパッタリング法により絶縁層を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1又は請求項2において、200℃乃至700℃の加熱処理により脱水化または脱水素化することを特徴とする半導体装置の作製方法。
- 請求項1乃至3のいずれか一項において、前記酸化物半導体層を形成する前記処理室は、クライオポンプを用いて排気することで残留水分を除去することを特徴とする半導体装置の作製方法。
- 請求項1乃至4のいずれか一項において、前記絶縁層を形成する処理室は、クライオポンプを用いて排気することで残留水分を除去することを特徴とする半導体装置の作製方法。
- 請求項1乃至5のいずれか一項において、前記絶縁層上に保護絶縁層を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1乃至6のいずれか一項において、前記金属酸化物のターゲットは、インジウム、ガリウム、又は亜鉛を含む金属酸化物であることを特徴とする半導体装置の作製方法。
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