JP2011086921A - 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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- JP2011086921A JP2011086921A JP2010205011A JP2010205011A JP2011086921A JP 2011086921 A JP2011086921 A JP 2011086921A JP 2010205011 A JP2010205011 A JP 2010205011A JP 2010205011 A JP2010205011 A JP 2010205011A JP 2011086921 A JP2011086921 A JP 2011086921A
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Abstract
【解決手段】半導体装置において、ゲート電極層(ゲート配線層)と、ソース電極層又はドレイン電極層と電気的に接続する配線層とは、薄膜トランジスタの酸化物半導体層を覆う絶縁層及びゲート絶縁層を間に介して交差する構造とする。ゲート電極層、ゲート絶縁層、及びソース電極層又はドレイン電極層の積層構造によって形成される寄生容量を低減することができ、半導体装置の低消費電力化を実現できる。
【選択図】図1
Description
半導体装置及び半導体装置の作製方法の一形態を図1、図2、及び図6を用いて説明する。
本実施の形態では、実施の形態1とは異なる構造の薄膜トランジスタを有する半導体装置の一例として以下に説明する。
本実施の形態では、薄膜トランジスタを有する半導体装置の作製工程の一部が実施の形態1と異なる他の例を図5に示す。図5は、図1及び図2と工程が一部異なる点以外は同じであるため、同じ箇所には同じ符号を用い、同じ箇所の詳細な説明は省略する。本実施の形態では、フォトリソグラフィ工程において、多階調マスクによって形成したマスク層を用いる。
本実施の形態では、実施の形態1において、ゲート電極層に透光性を有する導電材料を用いる例を図7に示す。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。また、図7は、図1及び図2と工程が一部異なる点以外は同じであるため、同じ箇所には同じ符号を用い、同じ箇所の詳細な説明は省略する。
本実施の形態では、薄膜トランジスタの作製工程の一部が実施の形態1と異なる例を図8に示す。図8は、図1及び図2と工程が一部異なる点以外は同じであるため、同じ箇所には同じ符号を用い、同じ箇所の詳細な説明は省略する。
本実施の形態では、実施の形態1において、酸化物半導体層とソース電極層又はドレイン電極層との間に、ソース領域及びドレイン領域として酸化物導電層を設ける例を図9に示す。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。また、図9は、図1及び図2と工程が一部異なる点以外は同じであるため、同じ箇所には同じ符号を用い、同じ箇所の詳細な説明は省略する。
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膜で囲む例を図10に示す。図10は、酸化物絶縁層の上面形状及び端部の位置が図1と異なる点、ゲート絶縁層の構成が異なる点以外は同じであるため、同じ箇所には同じ符号を用い、同じ箇所の詳細な説明は省略する。
本実施の形態では、実施の形態1乃至7に示した半導体装置において、薄膜トランジスタと、エレクトロルミネッセンスを利用する発光素子とを用い、アクティブマトリクス型の発光表示装置を作製する一例を示す。
本実施の形態では、発光表示パネル(発光パネルともいう)の外観及び断面について、図13を用いて説明する。図13は、第1の基板上に形成された薄膜トランジスタ及び発光素子を、第2の基板との間にシール材によって封止した、パネルの平面図であり、図13(B)は、図13(A)のH−Iにおける断面図に相当する。
半導体装置の一形態に相当する液晶表示パネルの外観及び断面について、図14を用いて説明する。図14は、薄膜トランジスタ4010、4011、及び液晶素子4013を、第1の基板4001と第2の基板4006との間にシール材4005によって封止した、パネルの平面図であり、図14(B)は、図14(A)または図14(C)のM−Nにおける断面図に相当する。
本実施の形態では、本発明の一実施の形態である半導体装置として電子ペーパーの例を示す。
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。
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23に示す。
Claims (14)
- 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酸化物半導体層と、
前記酸化物半導体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、前記酸化物半導体層と接する酸化物絶縁層と、
前記酸化物絶縁層上に前記ソース電極層又は前記ドレイン電極層と電気的に接続する配線層とを有し、
前記酸化物絶縁層には前記ソース電極層又は前記ドレイン電極層に達する開口が設けられ、
前記配線層は、前記開口において前記ソース電極層又は前記ドレイン電極層と接し、
前記ゲート電極層と前記配線層とは前記ゲート絶縁層及び前記酸化物半導体層を介して一部重なることを特徴とする半導体装置。 - 請求項1において、前記配線層の抵抗は、前記ソース電極層及び前記ドレイン電極層の抵抗より低い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、前記ソース電極層及び前記ドレイン電極層の膜厚は、前記配線層より薄い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、前記配線層はアルミニウム、又は銅を含むことを特徴とする半導体装置。
- 請求項1において、前記配線層は、第1の配線層及び第2の配線層の積層構造であり、
前記第1の配線層は前記ソース電極層又は前記ドレイン電極層と接していることを特徴とする半導体装置。 - 請求項5において、前記第1の配線層の抵抗は、前記ソース電極層及び前記ドレイン電極層の抵抗より低いことを特徴とする半導体装置。
- 請求項5又は請求項6において、前記ソース電極層及び前記ドレイン電極層の膜厚は、前記第1の配線層及び前記第2の配線層の膜厚より薄いことを特徴とする半導体装置。
- 請求項5乃至7のいずれか一項において、前記第1の配線層はアルミニウム膜、前記第2の配線層はチタン膜であることを特徴とする半導体装置。
- 請求項1乃至8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膜を含むことを特徴とする半導体装置。
- 請求項1乃至9のいずれか一項において、前記酸化物絶縁層は、酸化珪素膜、または、酸化アルミニウム膜であることを特徴とする半導体装置。
- 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酸化物半導体層を形成し、
前記酸化物半導体層を脱水化または脱水素化した後、大気に触れることなく、前記酸化物半導体層への水や水素の再混入を防ぎ、
前記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、前記酸化物半導体層の一部と接する酸化物絶縁層を形成し、
前記酸化物絶縁層に前記ソース電極層又は前記ドレイン電極層に達する開口を形成し、
前記開口に前記ソース電極層又は前記ドレイン電極層と接し、かつ前記ゲート電極層と前記ゲート絶縁層及び前記酸化物絶縁層を介して一部重なる配線層を形成し、
前記配線層は前記ソース電極層及び前記ドレイン電極層より膜厚が薄く、かつ抵抗が低いことを特徴とする半導体装置の作製方法。 - 請求項11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用い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11又は請求項12において、前記配線層はアルミニウム、又は銅を用い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11乃至13のいずれか一項において、前記酸化物絶縁層として、スパッタ法を用いて酸化珪素膜、または、酸化アルミニウム膜を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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