Dynamical study on charge injection and transport in a metal/poly(p-phenylene vinylene)/metal structure

Dong Mei Li*, Hai Hong Li, Yuan Li, De Sheng Liu, Shi Jie Xie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

On the basis of the tight-binding Su-Schrieffer-Heeger model, the dynamical process of charge injection from metal electrode to a polymer in a metal/poly(p-phenylene vinylene) (PPV)/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 PPV. The formation of the wave packet sensitively depends on the applied voltage, the electric field, and the contact between PPV and the metal electrode. In the absence of external fields, the charge can be injected into PPV chain and form wave packet under the critical bias voltage. With the increase of the electric field, the charge carriers can be ejected from PPV to the right metal electrode. But when the electric field becomes high enough, the wave packet can not be formed because it moves too fast in PPV. It is also shown that the number of ejected charges is not an integral multiple of the elementary charge e.

Original languageEnglish (US)
Pages (from-to)5217-5225
Number of pages9
JournalWuli Xuebao/Acta Physica Sinica
Volume57
Issue number8
StatePublished - Aug 2008
Externally publishedYes

Keywords

  • Carriers transport
  • Metal/poly(p-phenylene vinylene)/metal structure
  • Wave packet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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