Injection and transport of electric charge in a metal/copolymer structure

doi:10.1088/1674-1056/20/11/117203

中国物理B ›› 2011, Vol. 20 ›› Issue (11): 117203-117203.doi: 10.1088/1674-1056/20/11/117203

Injection and transport of electric charge in a metal/copolymer structure

李冬梅¹, 袁晓娟¹, 马嘉赛¹, 刘德胜²

(1)School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; (2)School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; Department of Physics, Jining University, Qufu 273155, China

收稿日期:2011-01-28 修回日期:2011-06-24 出版日期:2011-11-15 发布日期:2011-11-15
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2009CB929204), the National Natural Science Foundation of China (Grant No. 11074146), the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2010AM037 and ZR2010AM026), and the Independent Innovation Foundation of Shandong University, China (Grant No. 2009TS097).

Injection and transport of electric charge in a metal/copolymer structure

Li Dong-Mei(李冬梅)^a)†, Yuan Xiao-Juan(袁晓娟)^a), Ma Jia-Sai(马嘉赛)^a), and Liu De-Sheng(刘德胜)^a)b)

^a School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; ^b Department of Physics, Jining University, Qufu 273155, China

Received:2011-01-28 Revised:2011-06-24 Online:2011-11-15 Published:2011-11-15
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2009CB929204), the National Natural Science Foundation of China (Grant No. 11074146), the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2010AM037 and ZR2010AM026), and the Independent Innovation Foundation of Shandong University, China (Grant No. 2009TS097).

摘要/Abstract

摘要： The dynamical processes of the electric charge injection and transport from a metal electrode to the copolymer are investigated by using a nonadiabatic dynamic approach. The simulations are performed within the framework of an extended version of the one-dimensional Su-Schrieffer-Heeger (SSH) tight-binding model. It is found that the electric charge can be injected into the copolymer by increasing the applied voltage. For different structures of the copolymer, the critical voltage biases are different and the motion of the injected electric charge in the copolymer varies obviously. For the copolymer with a barrier-well-barrier configuration, the injected electric charge forms a wave packet due to the strong electron-lattice interaction in the barrier, then comes into the well and will be confined in it under a weak electric field. Under a medium electric field, the electric charge can go across the interface of two homopolymers and enter into the other potential barrier. For the copolymer with a well-barrier-well configuration, only under strong enough electric field can the electric charge transfer from the potential well into the barrier and ultimately reach a dynamic balance.

关键词: injection and transport, electron-lattice interactions, potential barrier, potential well

Abstract: The dynamical processes of the electric charge injection and transport from a metal electrode to the copolymer are investigated by using a nonadiabatic dynamic approach. The simulations are performed within the framework of an extended version of the one-dimensional Su-Schrieffer-Heeger (SSH) tight-binding model. It is found that the electric charge can be injected into the copolymer by increasing the applied voltage. For different structures of the copolymer, the critical voltage biases are different and the motion of the injected electric charge in the copolymer varies obviously. For the copolymer with a barrier-well-barrier configuration, the injected electric charge forms a wave packet due to the strong electron-lattice interaction in the barrier, then comes into the well and will be confined in it under a weak electric field. Under a medium electric field, the electric charge can go across the interface of two homopolymers and enter into the other potential barrier. For the copolymer with a well-barrier-well configuration, only under strong enough electric field can the electric charge transfer from the potential well into the barrier and ultimately reach a dynamic balance.

Key words: injection and transport, electron-lattice interactions, potential barrier, potential well

中图分类号: (Polymers; organic compounds (including organic semiconductors))

72.80.Le

73.40.Gk (Tunneling) 71.35.Ee (Electron-hole drops and electron-hole plasma)

李冬梅, 袁晓娟, 马嘉赛, 刘德胜. Injection and transport of electric charge in a metal/copolymer structure[J]. 中国物理B, 2011, 20(11): 117203-117203.

Li Dong-Mei(李冬梅), Yuan Xiao-Juan(袁晓娟), Ma Jia-Sai(马嘉赛), and Liu De-Sheng(刘德胜) . Injection and transport of electric charge in a metal/copolymer structure[J]. Chin. Phys. B, 2011, 20(11): 117203-117203.

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Injection and transport of electric charge in a metal/copolymer structure

Injection and transport of electric charge in a metal/copolymer structure

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