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

作　　者：李冬梅 刘晓静 李元 李海宏 胡贵超 高馄 刘德胜 解士杰 

机构地区：[1]School of Physics, Shandong University [2]State Key Laboratory of Crystal Materials, Shandong University

出　　处：《Chinese Physics B》2008年第8期3067-3076,共10页中国物理B（英文版）

基　　金：Project supported by the State Key Program of National Natural Science of China (Grant Nos 10474056 and 10574082);the Natural Science Foundation of Shandong Province (Grant No Z2005A01)

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 × 10^4 V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than 3.0 × 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.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 × 10^4 V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than 3.0 × 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 

分 类 号：O469[理学—凝聚态物理]