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)
a School of Physics, Shandong University, Jinan 250100, China; b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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.
Received: 04 September 2007
Revised: 31 March 2008
Accepted manuscript online:
Fund: 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).
Cite this article:
Li Dong-Mei(李冬梅), Liu Xiao-Jing(刘晓静), Li Yuan(李元), Li Hai-Hong(李海宏), Hu Gui-chao(胡贵超), Gao Kun(高琨), Liu De-Sheng(刘德胜), and Xie Shi-Jie(解士杰) Dynamical study on charge injection and transport in a metal/polythiophene/metal structure 2008 Chin. Phys. B 17 3067
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