高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (2): 298-305.doi: 10.7503/cjcu20180629

• 物理化学 • 上一篇    下一篇

二茂铁自组装分子结中电荷隧穿与跳跃传输的机理研究

韩宾, 于曦(), 胡文平()   

  1. 天津大学理学院, 天津市分子光电科学重点实验室, 天津 300072
  • 收稿日期:2018-09-11 出版日期:2019-02-10 发布日期:2018-12-19
  • 作者简介:

    联系人简介: 于 曦, 男, 博士, 研究员, 博士生导师, 主要从事分子尺度电子学研究. E-mail: xi.yu@tju.edu.cn; 胡文平, 男, 博士, 教授, 博士生导师, 主要从事有机光电材料及有机场效应晶体管研究. E-mail: huwp@tju.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 21773169, 51633006, 51733004)资助

Study on the Mechanism of Charge Tunneling and Hopping Transport in Ferrocene Self-Assembled Molecular Junctions

HAN Bin, YU Xi*(), HU Wenping*()   

  1. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, School of Science, Tianjin University, Tianjin 300072, China
  • Received:2018-09-11 Online:2019-02-10 Published:2018-12-19
  • Contact: YU Xi,HU Wenping E-mail:xi.yu@tju.edu.cn;huwp@tju.edu.cn
  • Supported by:
    † Supported by the National Natural Science of Foundation of China(Nos.21773169, 51633006, 51733004)

摘要:

采用硫醇自组装单层膜结合悬浮纳米线技术制备了分子结器件, 对比研究了非电活性的1-十一烷基硫醇(C11)和电活性的二茂铁己硫醇(FHT)分子结的电荷传输特性. 结合两种传输机理, 提出一种新的模型拟合了分子结的电流-电压特性, 发现了氧化还原活性中心二茂铁(Ferrocene, Fc)可以使电荷传输机理由隧穿变成隧穿与跳跃共存. 结合变温实验验证了这一机理, 并对这种混合机理出现的原因进行了分析.

关键词: 分子电子学, 分子结, 电荷传输, 隧穿与跳跃机理

Abstract:

The charge transport properties of non-electroactive 1-undecanethiol(C11) and electroactive 6-(ferrocenyl) hexanethiol(FHT) molecular junctions using thiol self-assembled monolayer combined with suspended nanowires technology were compared and studied. Combining the two transmission mechanisms, a new model was proposed to fit the current-voltage characteristics of the molecular junction. It is found that the FHT of redox active center molecule can change the charge transport from tunneling to tunneling-hopping coexistence mechanism. This mechanism was verified in combination with variable temperature experiment, and the possible reasons for this mixing process was explained.

Key words: Molecular electronics, Molecular junction, Charge transport, Tunneling and hopping mechanism

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