二次元半導体共電有機フレームワークにおける帯域輸送による優れた電荷移動性
Shuai Fu1, Enquan Jin1,2, Hiroki Hanayama3
1Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany.
Journal of the American Chemical Society
|April 14, 2022
まとめ
高伝導性の二次元共電性有機フレームワーク (2D COF) は,電子機器にとって有望である. 新しい TPB-TFB COF 薄膜は,有孔な材料で高効率な電荷運搬を可能にする,記録的な電荷運搬能力を示しています.
科学分野:
- 材料科学
- オーガニック電子
- ナノテクノロジー
背景:
- 二次元共性有機フレームワーク (2D COF) は,電子,触媒,センシング,エネルギー貯蔵における潜在能力を有する結晶性多孔ポリマーである.
- 高伝導性2DCOFの開発は,限られたπ結合と粒子の境界での電荷局所化により困難である.
- 2D COFの結晶フレームワーク内の電荷輸送メカニズムはよく理解されていません.
研究 の 目的:
- 半導体2DCOF薄膜の電荷輸送特性について調査する.
- オーガニック・エレクトロニクスと触媒の応用における TPB-TFB COF の可能性を調査する.
- 効率的な電荷輸送のための高結晶の多孔性材料の設計に関する洞察を得ること.
主な方法:
- 1,3,5-トリス・4-アミノフェニル・ベンゼン (TPB) と1,3,5-トリフォーミル・ベンゼン (TFB) を用いた2DCOF薄膜の合成
- 時間と周波数の解像度を持つテラヘルツスペクトロスコーピーは,電荷キャリアのダイナミクスを探査します.
- 光伝導性と電荷载体移動性の測定
主要な成果:
- テラヘルツスペクトロシピは,TPB-TFB COFの薄膜に固有のドリュード型帯域輸送を明らかにした.
- TPB-TFB COF薄膜は,室温で70 fsを超える電荷分散時間を持つ高い光伝導性を示した.
- 165 ± 10 cm2 V−1 s−1 の記録的な電荷载体移動性が達成され,既存の導電性COFを上回った.
結論:
- TPB-TFBのCOF薄膜は,高効率で長距離の電荷輸送を証明し,結晶の無機物質に似ている.
- TPB-TFBのCOFは,次世代の有機電子と触媒の強力な候補として位置づけられています.
- この研究は,電子特性を合わせた高度な多孔性の材料の合理的な設計のための基礎を提供します.
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