ハロゲン化されたペリレンビシミド半導体に基づく高性能,空気安定性,nチャンネル有機薄膜トランジスタ
Rüdiger Schmidt1, Joon Hak Oh, Ya-Sen Sun
1Universität Würzburg, Institut für Organische Chemie, Center for Complex Material Systems, Am Hubland, Germany.
Journal of the American Chemical Society
|April 10, 2009
まとめ
新しいペリレンビシミド (PBI) 有機半導体は,有機薄膜トランジスタ (OTFT) で優れた性能を示しています. これらのPBI材料は,空気中でも高い電子移動性と電流調節性を示し,実用的なアプリケーションを可能にします.
科学分野:
- オーガニック・エレクトロニクス
- マテリアルサイエンス 材料科学
- 半導体物理学の物理
背景:
- ペリレンビシミド (PBI) 染料は,多用途の有機半導体である.
- 調節分子構造は電子特性や固体包装に影響する.
- 有機薄膜トランジスタ (OTFT) は,電子アプリケーションでは高性能なnチャネル材料を必要とします.
研究 の 目的:
- 様々なハロゲンおよびフッ素イミド置換剤を用いた新しいPBI誘導体を合成し,特徴づけること.
- これらの置換剤がLUMOレベルと固体包装に与える影響を調査する.
- OTFTにおけるnチャンネル半導体としてのこれらのPBIsの性能を評価する.
主な方法:
- ハロゲン化ペリレンコアとフッ素化イミド基を含む14のPBI誘導体の合成.
- LUMOレベル決定のためのサイクル電圧計.
- 固体状態の包装分析のための単結晶X線 difraktion. 固体状態の包装分析のための単結晶X線 difraktion.
- トップコンタクト/ボトムゲートOTFTの製造は,真空堆積によるものです.
- 窒素と空気における電気的特徴.
- 薄膜構造分析のための牧草インシデンスX線 difraktion (GIXD) と原子力顕微鏡 (AFM).
主要な成果:
- フラットコアと最大2つのフッ素置換剤を持つPBIsは,特にOTS-S基板と空気 (移動性>0.5cm2/Vs,I (オン) /I (オフ) >106) で,優れたnチャンネルトランジスタ性能を示しました.
- PBIデリバティブ1a (PTCDI-C4F7) は,窒素と空気の両方で1cm2/Vs以上の移動性と106のオン-オフ比を達成しました.
- 歪んだ,テトラハロゲン化PBIsは,より好ましくない包装とより低いOTFTパフォーマンスを示し,テトラ塩素化デリバティブ (2d) の1つだけが良好なパフォーマンスを示しました.
結論:
- PBIの分子設計,特にコア平面性と置換剤のタイプは,固体包装とOTFTの性能に大きな影響を与えます.
- 最適化されたPBIデリバティブは,高い電子移動性と優れた空気安定性を示し,実用的なnチャネル半導体アプリケーションに適しています.
- この研究は,高度な有機電子機器のためのPBI構造の潜在力を強調しています.
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