1.5 - 7.5 nm オリゴフェニレンイミン分子ワイヤの2つの結合プラットフォームにおけるDCとAC輸送の比較:エウテクティック・ガイン対伝導探査機原子力顕微鏡の結合
C S Suchand Sangeeth1, Abel T Demissie2, Li Yuan1
1Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
Journal of the American Chemical Society
|May 13, 2016
まとめ
オリゴフェニレンイミン (OPI) 分子の電気輸送を測定し 4nmでトンネルからジャンプへのスイッチを見つけました この研究は,分子電子と介電特性に関する重要な洞察を明らかにします.
科学分野:
- 分子電子
- 凝縮物質物理学
- 材料科学
背景:
- 結合オリゴフェニレニミン (OPI) 分子は電子アプリケーションのために合成されます.
- ナノスケールデバイスの開発には,分子ワイヤの電荷輸送メカニズムを理解することが重要です.
研究 の 目的:
- 異なる長さのOPI分子膜のDCとAC輸送特性を調査する.
- OPI分子ワイヤの介電定数と電荷輸送レジム (トンネリング対ホッピング) を決定する.
主な方法:
- Au-S-OPI//GaOx/EGaInの交差点で利用されたDCとACの輸送測定.
- Au表面のイミン凝縮化学を用いてOPIフィルムを合成した.
- 分子傾斜の角度を決定するために,近辺X線吸収微細構造 (NEXAFS) のスペクトロスコーピーを採用した.
主要な成果:
- トンネリングからジャンプ輸送までのクロスオーバーを4 nmの分子長さで観測した.
- 0.245 ± 0.008 eVの活性化エネルギーを持つ4 nm以上のOPIワイヤの活性化輸送を決定する.
- 分子長 (β = 2.84 nm−1 トンネリング,β = 1.01 nm−1 ホッピング) に導電性の量化指数関数依存度および 4.3 ± 0.2 の介電定数.
結論:
- この研究は,OPI分子ワイヤの電荷輸送に関する包括的な理解を提供します.
- ディエレクトリック特性を含め,異なる輸送方式と数値化された主要な電子パラメータを特定した.
- 金属分子接触抵抗が絶対結合抵抗値に与える影響を強調した.
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