オリゴフッロレン誘導体の半導体膜の微細構造の厚さによる依存性
Dean M DeLongchamp1, Mang Mang Ling, Youngsuk Jung
1Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. deand@nist.gov
Journal of the American Chemical Society
|December 21, 2006
まとめ
私たちは,有機半導体フィルムの微細構造を測定するために,近辺X線吸収微細構造 (NEXAFS) 光譜を用いた新しい方法を開発しました. この技術は,分子指向とフィルムの厚さが電子性能にどのように影響し,デバイスの効率を最適化するかを明らかにします.
科学分野:
- マテリアルサイエンス 材料科学
- オーガニック・エレクトロニクス
- スペクトル顕微鏡検査です.
背景:
- オーガニック半導体フィルムの微構造は,電子性能に重大な影響を及ぼします.
- 微細構造の開発を理解することは,有機電子機器を最適化するための鍵です.
研究 の 目的:
- 薄膜におけるマイクロ構造の厚さ依存を測定するための一般的な方法を示す.
- オリゴフルオレン誘導体 (DDFTTF) にこの方法を適用し,電子特性を持つ微構造を相関させる.
主な方法:
- 表面に敏感な近辺X線吸収微細構造 (NEXAFS) のスペクトロスコーピーを利用しました.
- 原子力顕微鏡 (AFM) を使って,テラスの高さを決定しました.
- ラミネーション技術を使用して,飽和孔の移動性を測定しました.
主要な成果:
- DDFTTFフィルムにおけるアロマティック・コアとアリファティック・エンド・チェーンの基板相対的方向性を独立に決定した.
- DDFTTFフィルム (6-150 nm) の2つの好ましい微構造を特定しました:大きなテラスでの垂直的指向と,より小さな領域での水平的指向.
- 微細構造の分布は,膜の厚さ,基板からの距離,および堆積時の基板温度に依存することを発見しました.
- より大きなpi軌道配列を持つ相関する局所マイクロ構造は,局所飽和孔の移動性を改善します.
結論:
- 開発されたNEXAFSメソッドは,有機薄膜におけるマイクロ構造の厚さ依存度を測定するための一般的なアプローチを提供します.
- DDFTTFフィルムは,堆積条件の影響を受け,電子性能に影響する独特の微細構造を示します.
- 制御された堆積を介してマイクロ構造を最適化することで,有機半導体における電荷輸送を向上させることができます.
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