JP6785563B2 - 非線形素子、アレイ基板、およびアレイ基板の製造方法 - Google Patents
非線形素子、アレイ基板、およびアレイ基板の製造方法 Download PDFInfo
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- JP6785563B2 JP6785563B2 JP2016029561A JP2016029561A JP6785563B2 JP 6785563 B2 JP6785563 B2 JP 6785563B2 JP 2016029561 A JP2016029561 A JP 2016029561A JP 2016029561 A JP2016029561 A JP 2016029561A JP 6785563 B2 JP6785563 B2 JP 6785563B2
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- oxide semiconductor
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- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
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Description
まず、本発明の前提となる技術(前提技術)について説明する。
まず、ソース配線に接続される非線形素子(双方向ダイオード)の構成について説明する。
まず、ソース配線に接続される非線形素子(双方向ダイオード)の構成について説明する。
本発明による実施の形態3では、実施の形態2における非線形素子(双方向ダイオード)を、FFS方式を採用したアレイ基板(以下、FFS用アレイ基板という)に適用する場合について説明する。実施の形態2における双方向ダイオードは、FFS用アレイ基板との整合性が良く、第2のバック電極25および第3のバック電極26を、FFS用アレイ基板における液晶駆動電極(画素電極またはコモン電極)と同層かつ同一材料で形成することが可能である。従って、有機絶縁膜上に液晶駆動電極を配置した高開口率化が可能なFFS用アレイ基板において、工程数を増やすことなく、バック電極を用いた保護回路を形成することができる。
上述の通り、酸化物半導体膜は、TFTのソース電極およびドレイン電極に用いられる一般的な金属膜(Cr、Ti、Mo、Ta、Al、Cu、またはこれらの合金)のエッチング加工に用いられる酸系溶液によってエッチングダメージを受ける。従って、酸化物半導体膜6,31上にソース電極7およびドレイン電極10をエッチングによって形成した場合は、ソース電極7とドレイン電極10との間における酸化物半導体膜6,31(チャネル)の表面で酸素欠損が増加し、その結果キャリア濃度が急激に上昇する。従って、キャリア濃度の増加を抑制するために、酸素を含んだ雰囲気中でアニールを行う。しかし、キャリア濃度の増加は、酸化物半導体膜6,31と接触する金属の種類またはエッチング時の溶液の温度によって変化しやすく、酸化処理が不足するとTFTのオフ動作不良、および非線形素子では抵抗が減少することによるリークが問題となる。また、酸化が過剰になると、TFTではキャリア濃度が下がってオン電流および移動度が低下してしまう。本発明の実施の形態4では、このような問題を解決しており、以下に説明する。
Claims (18)
- 基板上に形成された遮光体と、
前記遮光体を覆うように形成された第1絶縁膜と、
前記第1絶縁膜上であって前記遮光体と平面視で重なるように形成された第1酸化物半導体膜と、
前記第1酸化物半導体膜上において互いが離間する離間部分を有して形成された第1ソース電極および第1ドレイン電極と、
前記第1酸化物半導体膜、前記第1ソース電極、および前記第1ドレイン電極を覆うように形成された第2絶縁膜と、
前記第2絶縁膜上に形成され、コンタクトホールを介してソース配線に接続された第1バック電極と、
を備え、
前記第1バック電極は、前記第1ソース電極と、前記第1酸化物半導体膜上における前記離間部分の一部とに対して平面視で重なり、かつ前記離間部分における前記一部以外の他の部分に対して平面視で重ならないように形成され、
前記第2絶縁膜上に形成された第2バック電極と、
前記第2バック電極および前記第2絶縁膜の表面を覆うように形成された第3絶縁膜と、
をさらに備え、
前記第1バック電極は、前記第3絶縁膜上に形成され、
前記第2バック電極は、共通電位配線に接続され、かつ前記第1ドレイン電極と、前記第1酸化物半導体膜上における前記離間部分の一部とに対して平面視で重なるように形成されることを特徴とする、非線形素子。 - 前記第1バック電極および前記第2バック電極は、前記第1酸化物半導体膜上において前記第3絶縁膜を介して平面視で重なるように形成されることを特徴とする、請求項1に記載の非線形素子。
- 前記第2絶縁膜は、無機絶縁膜と、当該無機絶縁膜上に形成された有機絶縁膜との積層膜であることを特徴とする、請求項1または2に記載の非線形素子。
- 前記第1酸化物半導体膜は、前記離間部分の少なくとも一部が前記第1バック電極に平面視で覆われないことを特徴とする、請求項1から3のいずれか1項に記載の非線形素子。
- FFS(Fringe Field Switching)方式を採用したアレイ基板であって、
請求項1から4のいずれか1項に記載の非線形素子を備えることを特徴とする、アレイ基板。 - FFS(Fringe Field Switching)方式を採用したアレイ基板であって、
請求項1に記載の非線形素子を有し、
前記第1バック電極と同一材料により形成された櫛歯電極と、
前記第2バック電極と同一材料により形成されたコモン電極と、
を備える、アレイ基板。 - 請求項6に記載のアレイ基板の製造方法であって、
前記第1バック電極および前記櫛歯電極は同時に形成され、前記第2バック電極および前記コモン電極は同時に形成されることを特徴とする、アレイ基板の製造方法。 - TFT(Thin Film Transistor)をさらに備え、
前記TFTは、
前記第1絶縁膜上に形成された第2酸化物半導体膜と、
前記第2酸化物半導体膜上において互いが離間するように形成された第2ソース電極および第2ドレイン電極と、
前記第2ソース電極、前記第2酸化物半導体膜、および前記第2ドレイン電極に渡って形成された第3酸化物半導体膜とを有し、
前記非線形素子は、前記第1酸化物半導体膜に代えて、前記第1ソース電極、前記第1酸化物半導体膜、および前記第1ドレイン電極に渡って形成された前記第3酸化物半導体膜を備えることを特徴とする、請求項6に記載のアレイ基板。 - 前記第2酸化物半導体膜は、前記第3酸化物半導体膜よりも低酸素濃度であることを特徴とする、請求項8に記載のアレイ基板。
- 基板上に互いが離間するように形成されたゲート配線および遮光体と、
前記ゲート配線および前記遮光体を覆うように形成された第1絶縁膜と、
前記第1絶縁膜上であって前記遮光体と平面視で重なるように形成された第1酸化物半導体膜と、
前記第1酸化物半導体膜上において互いに離間する離間部分を有して形成された第1ソース電極および第1ドレイン電極と、
前記第1酸化物半導体膜、前記第1ソース電極、および前記第1ドレイン電極を覆うように形成された第2絶縁膜と、
前記第2絶縁膜上に形成され、コンタクトホールを介して前記ゲート配線および前記第1ソース電極に接続された第1バック電極と、
を備え、
前記第1バック電極は、前記第1ソース電極と、前記第1酸化物半導体膜上における前記離間部分の一部とに対して平面視で重なり、かつ前記離間部分における前記一部以外の他の部分に対して平面視で重ならないように形成され、
前記第2絶縁膜上に形成された第2バック電極と、
前記第2バック電極および前記第2絶縁膜の表面を覆うように形成された第3絶縁膜と、
をさらに備え、
前記第1バック電極は、前記第3絶縁膜上に形成され、
前記第2バック電極は、共通電位配線に接続され、かつ前記第1ドレイン電極と、前記第1酸化物半導体膜上における前記離間部分の一部とに対して平面視で重なるように形成されることを特徴とする、非線形素子。 - 前記第1バック電極および前記第2バック電極は、前記第1酸化物半導体膜上において前記第3絶縁膜を介して平面視で重なるように形成されることを特徴とする、請求項10に記載の非線形素子。
- 前記第2絶縁膜は、無機絶縁膜と、当該無機絶縁膜上に形成された有機絶縁膜との積層膜であることを特徴とする、請求項10または11に記載の非線形素子。
- 前記第1酸化物半導体膜は、前記離間部分の少なくとも一部が前記第1バック電極に平面視で覆われないことを特徴とする、請求項10から12のいずれか1項に記載の非線形素子。
- FFS(Fringe Field Switching)方式を採用したアレイ基板であって、
請求項10から13のいずれか1項に記載の非線形素子を備えることを特徴とする、アレイ基板。 - FFS(Fringe Field Switching)方式を採用したアレイ基板であって、
請求項10に記載の非線形素子を有し、
前記第1バック電極と同一材料により形成された櫛歯電極と、
前記第2バック電極と同一材料により形成されたコモン電極と、
を備える、アレイ基板。 - 請求項15に記載のアレイ基板の製造方法であって、
前記第1バック電極および前記櫛歯電極は同時に形成され、前記第2バック電極および前記コモン電極は同時に形成されることを特徴とする、アレイ基板の製造方法。 - TFT(Thin Film Transistor)をさらに備え、
前記TFTは、
前記第1絶縁膜上に形成された第2酸化物半導体膜と、
前記第2酸化物半導体膜上において互いが離間するように形成された第2ソース電極および第2ドレイン電極と、
前記第2ソース電極、前記第2酸化物半導体膜、および前記第2ドレイン電極に渡って形成された第3酸化物半導体膜とを有し、
前記非線形素子は、前記第1酸化物半導体膜に代えて、前記第1ソース電極、前記第1酸化物半導体膜、および前記第1ドレイン電極に渡って形成された前記第3酸化物半導体膜を備えることを特徴とする、請求項15に記載のアレイ基板。 - 前記第2酸化物半導体膜は、前記第3酸化物半導体膜よりも低酸素濃度であることを特徴とする、請求項17に記載のアレイ基板。
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