JP2011029627A - 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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- JP2011029627A JP2011029627A JP2010148043A JP2010148043A JP2011029627A JP 2011029627 A JP2011029627 A JP 2011029627A JP 2010148043 A JP2010148043 A JP 2010148043A JP 2010148043 A JP2010148043 A JP 2010148043A JP 2011029627 A JP2011029627 A JP 2011029627A
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- oxide semiconductor
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- 239000013077 target material Substances 0.000 description 1
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Abstract
【解決手段】チャネル形成領域を含む半導体層、ソース領域及びドレイン領域を酸化物半導体層とする薄膜トランジスタを有する半導体装置の作製方法において、酸化物半導体層の純度を高め、不純物である水分などを低減する加熱処理(脱水化または脱水素化のための加熱処理)を行う。
【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乃至図3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26を用いて説明する。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27を用いて説明する。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4乃至図8を用いて説明する。
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。
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22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。
Claims (7)
- 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の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜上に第2の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜及び前記第2の酸化物半導体膜を加熱して脱水化、又は脱水素化させた後、
前記脱水化、又は脱水素化させた第1の酸化物半導体膜及び第2の酸化物半導体膜を選択的にエッチングして第1の酸化物半導体層及び第2の酸化物半導体層を形成し、
前記第1の酸化物半導体層及び前記第2の酸化物半導体層上に導電膜を形成し、
前記第1の酸化物半導体層、前記第2の酸化物半導体層、前記導電膜を選択的にエッチングして半導体層、ソース領域、ドレイン領域、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、前記半導体層、前記ソース領域、前記ドレイン領域、前記ソース電極層、及び前記ドレイン電極層上に前記半導体層の一部と接する酸化物絶縁膜を形成してキャリア濃度を低減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の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜上に第2の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜及び前記第2の酸化物半導体膜を不活性雰囲気下で加熱してキャリア濃度を増加させた後、
前記キャリア濃度を増加した第1の酸化物半導体膜及び第2の酸化物半導体膜を選択的にエッチングして第1の酸化物半導体層及び第2の酸化物半導体層を形成し、
前記第1の酸化物半導体層及び前記第2の酸化物半導体層上に導電膜を形成し、
前記第1の酸化物半導体層、前記第2の酸化物半導体層、前記導電膜を選択的にエッチングして半導体層、ソース領域、ドレイン領域、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、前記半導体層、前記ソース領域、前記ドレイン領域、前記ソース電極層、及び前記ドレイン電極層上に前記半導体層の一部と接する酸化物絶縁膜を形成してキャリア濃度を低減することを特徴とする半導体装置の作製方法。 - 請求項2において前記不活性雰囲気は窒素、または希ガスであることを特徴とする半導体装置の作製方法。
- 請求項2又は請求項3において、前記第1の酸化物半導体膜及び前記第2の酸化物半導体膜を不活性雰囲気下、かつ温度400度以上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2又は請求項3において、前記第1の酸化物半導体膜及び前記第2の酸化物半導体膜を不活性雰囲気下、かつ温度400度以上で加熱した後、室温以上100℃未満まで徐冷を行うことを特徴とする半導体装置の作製方法。
- 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の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜上に第2の酸化物半導体膜を形成し、
前記第1の酸化物半導体膜及び前記第2の酸化物半導体膜を減圧下で加熱してキャリア濃度を増加させた後、
前記キャリア濃度を増加した第1の酸化物半導体膜及び第2の酸化物半導体膜を選択的にエッチングして第1の酸化物半導体層及び第2の酸化物半導体層を形成し、
前記第1の酸化物半導体層及び前記第2の酸化物半導体層上に導電膜を形成し、
前記第1の酸化物半導体層、前記第2の酸化物半導体層、前記導電膜を選択的にエッチングして半導体層、ソース領域、ドレイン領域、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、前記半導体層、前記ソース領域、前記ドレイン領域、前記ソース電極層、及び前記ドレイン電極層上に前記半導体層の一部と接する酸化物絶縁膜を形成してキャリア濃度を低減することを特徴とする半導体装置の作製方法。 - 請求項2乃至6のいずれか一項において、前記キャリア濃度を増加した酸化物半導体層のキャリア濃度は、1×1018/cm3以上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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