JP6305503B2 - アクティブ層、薄膜トランジスタアレイ基板及び表示装置 - Google Patents
アクティブ層、薄膜トランジスタアレイ基板及び表示装置 Download PDFInfo
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- JP6305503B2 JP6305503B2 JP2016243583A JP2016243583A JP6305503B2 JP 6305503 B2 JP6305503 B2 JP 6305503B2 JP 2016243583 A JP2016243583 A JP 2016243583A JP 2016243583 A JP2016243583 A JP 2016243583A JP 6305503 B2 JP6305503 B2 JP 6305503B2
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Description
前記基板上のゲート電極と、
前記ゲート電極上のゲート絶縁膜と、
前記ゲート絶縁膜上に位置し、半導体物質及び複数の炭素同素体で構成されたアクティブ層と、
前記アクティブ層に各々接触するソース電極及びドレイン電極と、
を備える薄膜トランジスタアレイ基板である。
前記薄膜トランジスタアレイ基板上の有機絶縁膜と、
前記有機絶縁膜上の画素電極と、
を備える表示装置である。
なお、明細書全体にわたって同じ参照符号は、実質的に同じ構成要素を意味する。以下の説明において、本発明と関連した公知技術あるいは構成に対する具体的な説明が本発明の要旨を不要に濁すと判断される場合、その詳細な説明を省略する。また、以下の説明において使用される構成要素の名称は、明細書作成の容易さを考慮して選択されたものに過ぎず、実際、製品の部品名称とは相違することがあり得る。
本発明は、炭素同素体と半導体物質とを含む薄膜トランジスタを開示し、具体的に、炭素同素体と半導体物質とを含むアクティブ層が形成された薄膜トランジスタを開示する。薄膜トランジスタは、表示装置のスイッチング素子または駆動素子として使用される。
本発明において開示する炭素同素体は、互いに共有結合された炭素原子の多環芳香族分子を表す。共有結合された炭素原子は、繰り返し単位として6個の構成要素からなる環を形成でき、また、5個の構成要素からなる環及び7個の構成要素からなる環のうちの1つ以上を含むこともできる。炭素同素体は、単一層であり得るし、または炭素同素体の他の層上に積層された複数の炭素同素体層を備えることもできる。炭素同素体は、1次元または2次元構造を有する。炭素同素体は、約100nmの最大厚みを有し、具体的に、約10nm〜約90nm、より具体的には、約20nm〜約80nmの厚みを有する。
本発明の半導体物質は、セラミック半導体または有機半導体物質であって、溶液でコーティングが可能な材料を使用することができる。
セラミック半導体は、セラミックの電気的な性質を用いたものであって、セラミックは、電子があるイオンや原子に束縛されているため、自由に動くことができず、電気をほとんど通さないが、外部から電界が加えられれば、これに反応して束縛された電子が再配列を起こして状態が変わりながら電子が動くようになる。セラミック半導体は、シリコン(Si)、ゲルマニウム(Ge)、セレニウム(Se)、アルミニウム(Al)、チタン(Ti)、ジルコニウム(Zr)などの金属元素が酸素(O)、炭素(C)、窒素(N)などと結合して作られた酸化物、炭化物、窒化物からなる。代表的なセラミック半導体では、チタン酸バリウム(BaTiO3)を挙げることができる。
図1及び図2は、本発明の炭素同素体−半導体組成物を製造する工程を示した図である。
本発明は、炭素同素体と半導体物質とを混合して炭素同素体−半導体組成物を製造できる。より詳細には、図1に示すように、炭素同素体フレークと半導体物質とを用意する。炭素同素体フレークと半導体物質とは粉末形態で用意することができる。炭素同素体フレークと半導体物質とを溶媒に入れて混合して炭素同素体−半導体組成物を製造する。前述したこととは異なり、図2に示すように、本発明の炭素同素体−半導体組成物は、半導体物質が含まれた半導体溶液に炭素同素体が分散された炭素同素体分散液を混合して製造されることができる。
図3は、本発明の実施形態に係る薄膜トランジスタアレイ基板を示した断面図であり、図4は、本発明の実施形態に係るアクティブ層を示した平面図であり、図5は、本発明の実施形態に係る薄膜トランジスタの電子及び正孔の移動を示した模式図であり、図6は、本発明の実施形態に係る表示装置を示した断面図である。
本発明において開示する薄膜トランジスタアレイ基板は、アクティブ層下部にゲート電極が位置するボトムゲート型(bottom−gate type)薄膜トランジスタを例として説明する。しかし、本発明は、これに限定されず、アクティブ層上部にゲート電極が位置するトップゲート型(top−gate type)薄膜トランジスタも適用可能である。
図6に示すように、ソース電極135a及びドレイン電極135bの上に有機絶縁膜140が位置する。有機絶縁膜140は、下部の段差を平坦化するものであって、フォトアクリル(photo acryl)、ポリイミド(polyimide)、ベンゾシクロブテン系樹脂(benzocyclobutene resin)、アクリレート系樹脂(acrylate)などの有機物からなることができる。有機絶縁膜140は、ドレイン電極135bを露出するビアホ―ル145を備える。図示していないが、ソース電極135a及びドレイン電極135bの上にシリコン酸化物(SiOx)、シリコン窒化物(SiNx)、またはこれらの多層からなるパッシベーション膜が位置することもできる。
図8は、本発明のアクティブ層のAFM分析イメージであり、図9は、図8のA領域を測定したXPSグラフであり、図10は、図8のB領域を測定したXPSグラフである。
図8に示すように、アクティブ層のAFM(Atomic Force Microscope)分析イメージをみると、炭素同素体が互いに結合して多くのドメインを形成していることが観察される。特に、位相(phase)差を介して炭素同素体が形成されている位置と炭素同素体が形成されていない位置とに対する差を確認できる。
この結果により、本発明の炭素同素体−半導体組成物によって製造されたアクティブ層は、炭素同素体がドメインをなしていることが確認できた。
<実施例>
前述した図2に示されたように、ボトムゲート型薄膜トランジスタに炭素同素体と半導体とを含むアクティブ層を形成して薄膜トランジスタを製造した。ここで、半導体物質は、IGZOで形成した。
<比較例>
アクティブ層を純粋IGZOのみで形成したこと以外は、前述した実施例と同様にして薄膜トランジスタを製造した。
前述した実施例と比較例とによって製造された薄膜トランジスタの電流−電圧カーブを測定して図11に示し、しきい電圧とオン電流とを下記の表1に示した。
この結果により、IGZOのみからなるアクティブ層を含む薄膜トランジスタに比べて、IGZOの半導体と炭素同素体とからなるアクティブ層を含む薄膜トランジスタのしきい電圧とオン電流特性とが優れていることを確認できた。
Claims (12)
- 半導体物質及び複数の炭素同素体を含み、
前記半導体物質は、セラミック半導体またはIGZOであり、
前記炭素同素体は、還元グラフェンオキサイド(rGO)、非酸化グラフェン、またはグラフェンナノリボンのうちのいずれか1つまたはこれらの混合物であり、
前記炭素同素体は、前記半導体物質100重量%に対して0.05〜1重量%で含まれるアクティブ層。 - 前記炭素同素体は、前記半導体物質内に分散されており、複数のドメインをなす請求項1に記載のアクティブ層。
- 前記ドメインは、前記複数の炭素同素体の炭素間化学的結合によって1つのドメインをなす請求項2に記載のアクティブ層。
- 前記炭素同素体は、1次元または2次元構造を有する請求項1〜3のいずれか一項に記載のアクティブ層。
- 基板と、
前記基板上のゲート電極と、
前記ゲート電極上のゲート絶縁膜と、
前記ゲート絶縁膜上に位置し、半導体物質及び複数の炭素同素体で構成されたアクティブ層と、
前記アクティブ層に各々接触するソース電極及びドレイン電極と、
を備え、
前記半導体物質は、セラミック半導体またはIGZOであり、
前記炭素同素体は、還元グラフェンオキサイド(rGO)、非酸化グラフェン、またはグラフェンナノリボンのうちのいずれか1つまたはこれらの混合物であり、
前記炭素同素体は、前記半導体物質100重量%に対して0.05〜1重量%で含まれる薄膜トランジスタアレイ基板。 - 前記炭素同素体は、前記半導体物質内に分散されており、複数のドメインをなす請求項5に記載の薄膜トランジスタアレイ基板。
- 前記複数のドメインは、前記アクティブ層のチャネルに位置する請求項6に記載の薄膜トランジスタアレイ基板。
- 前記ドメインは、前記複数の炭素同素体の炭素間化学的結合によって1つのドメインをなす請求項6に記載の薄膜トランジスタアレイ基板。
- 前記炭素同素体は、1次元または2次元構造を有する請求項5〜8のいずれか一項に記載の薄膜トランジスタアレイ基板。
- 請求項5〜9のいずれか一項による薄膜トランジスタアレイ基板と、
前記薄膜トランジスタアレイ基板上の有機絶縁膜と、
前記有機絶縁膜上の画素電極と、
を備える表示装置。 - 前記画素電極と電気的に連結された有機発光ダイオードと、
前記有機発光ダイオード上の封止層と、
前記封止層上のカバーウィンドウと、
をさらに備える請求項10に記載の表示装置。 - 前記画素電極と同一平面上または下部で離間して位置する共通電極と、
前記共通電極上の液晶層と、
をさらに備える請求項10または11に記載の表示装置。
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