テトラセノテトラセノとペンタセノペンタセノに基づく優れた半導体:安定した閉殻からシングレット開殻へ
Tanguy Jousselin-Oba1, Masashi Mamada2, Jérôme Marrot1
1UMR CNRS 8180 , UVSQ, Institut Lavoisier de Versailles, Université Paris-Saclay , 45 Avenue des Etats-Unis , 78035 Versailles Cedex , France.
Journal of the American Chemical Society
|May 24, 2019
まとめ
新しい安定した有機半導体であるテトラセノテトラセノ (TT) とペンタセノペンタセノ (PP) は,有機フィールド効果トランジスタ (OFET) で高い電荷移動性を達成する. これらの材料は オープンシェルの特性を高め,先進的な電子アプリケーションの道を開きます.
科学分野:
- 材料科学
- オーガニック電子
- 半導体物理学
背景:
- 安定したオープンシェル有機材料の設計は 分子有機半導体の進歩に不可欠です
- 現在のオーガニック・フィールド・エフェクト・トランジスタ (OFET) は,通常10−3cm2V−1s−1ほどで,限られた電荷移動性を有する.
- π トポロジーを修正することは,新しい有機半導体特性を開発するための重要な戦略です.
研究 の 目的:
- テトラセノテトラセン (TT) とペンタセノペンタセン (PP) の新型半融合有機物質を合成し,特徴づけること.
- TTとPPの基本状態の性質,安定性,およびビラジカル特性について調査する.
- 有機フィールド効果トランジスタ (OFET) の活性層としてのTTとPPの性能を評価する.
主な方法:
- 環融合テトラセノテトラセノ (TT) とペンタセノペンタセノ (PP) の合成
- 安定状態の吸収,電子スピン共振,超伝導量子干渉装置,および可変温度NMRを用いた特徴付け.
- 電子構造を理解するための密度関数理論 (DFT) の計算.
- TG-BCとBG-TCのコンフィギュレーションの薄膜OFET装置の製造と試験
主要な成果:
- TTとPPは低帯域ギャップで合成された (それぞれ1.79 eVと1.42 eV).
- PPは,独特のπトポロジーに起因する0.64のビラジカル特性を有するシングレットオープンシェル構造を示している.
- 高孔移動性はOFETで達成された:PPでは1.4cm2V−1s−1,TTでは0.77cm2V−1s−1 (TG-BC構成).
- 二つの材料 (BG-TC構成) で,重要な穴と電子の移動性が観察されました.
結論:
- 合成されたTTとPPの材料は高い安定性と望ましいオープンシェル特性を示しています.
- OFETの性能は,特に穴の移動性において,既存の有機半導体を大幅に上回ります.
- これらの発見は,高性能な有機電子機器のための周辺融合型πシステムの可能性を強調しています.
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