中国物理B ›› 2008, Vol. 17 ›› Issue (8): 3067-3076.doi: 10.1088/1674-1056/17/8/050

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Dynamical study on charge injection and transport in a metal/polythiophene/metal structure

李冬梅1, 刘晓静1, 李 元1, 李海宏1, 胡贵超1, 高 琨1, 刘德胜1, 解士杰2   

  1. (1)School of Physics, Shandong University, Jinan 250100, China; (2)School of Physics, Shandong University, Jinan 250100, China;State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • 收稿日期:2007-09-04 修回日期:2008-03-31 出版日期:2008-08-20 发布日期:2008-08-20
  • 基金资助:
    Project supported by the State Key Program of National Natural Science of China (Grant Nos 10474056 and 10574082) and the Natural Science Foundation of Shandong Province (Grant No Z2005A01).

Dynamical study on charge injection and transport in a metal/polythiophene/metal structure

Li Dong-Mei(李冬梅)a), Liu Xiao-Jing(刘晓静)a), Li Yuan(李元)a), Li Hai-Hong(李海宏)a), Hu Gui-chao(胡贵超)a), Gao Kun(高琨)a), Liu De-Sheng(刘德胜)a)†, and Xie Shi-Jie(解士杰)a)b)   

  1. a School of Physics, Shandong University, Jinan 250100, China; b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2007-09-04 Revised:2008-03-31 Online:2008-08-20 Published:2008-08-20
  • Supported by:
    Project supported by the State Key Program of National Natural Science of China (Grant Nos 10474056 and 10574082) and the Natural Science Foundation of Shandong Province (Grant No Z2005A01).

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摘要： The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene (PT)/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interaction in PT. We demonstrate that the dynamical formation of the wave packet sensitively depends on the strength of applied voltage, the electric field, and the contact between PT and electrode. At a strength of the electric field more than $3.0\times 10^{4}$\,V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than $3.0\times 10^{5}$\,V/cm, the wave packet cannot form while it moves rapidly to the right PT/metal interface. It is shown that the ejected quantity of charge is noninteger.

关键词: metal/polythiophene/metal structure, electron-phonon interactions, carriers transport, wave packet

Abstract: The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene (PT)/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interaction in PT. We demonstrate that the dynamical formation of the wave packet sensitively depends on the strength of applied voltage, the electric field, and the contact between PT and electrode. At a strength of the electric field more than $3.0\times 10^{4}$ V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than $3.0\times 10^{5}$ V/cm, the wave packet cannot form while it moves rapidly to the right PT/metal interface. It is shown that the ejected quantity of charge is noninteger.

Key words: metal/polythiophene/metal structure, electron-phonon interactions, carriers transport, wave packet

中图分类号:  (Metal-insulator-metal structures)

  • 73.40.Rw
71.38.-k (Polarons and electron-phonon interactions)