Backward Charge Transfer in Conjugated Polymers |
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| Authors: | CHENG Meng-Xing LI Guang-Qi Thomas F. George SUN Xin |
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| Affiliation: | 1. Research Center for Theoretical Physics and ResearchCenter for Quantum Manipulation, Fudan University, Shanghai 200433, China;2. National Lab of Infrared Physics, Shanghai Institute ofTechnical Physics, Shanghai 200083, China;3. Office of the Chancellor/Departments of Chemistry& Biochemistry and Physics & Astronomy, University of Missouri-St. Louis, St. Louis, Missouri 63121, USA |
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| Abstract: | ![]()
It has been known that the static polarizability of a polymer chain with a biexciton is negative.In order to understand this peculiar fact, this paper studies thedynamical process of the charge transfer in the polymer chaininduced by an external electric field E during formingthe biexciton. The time dependence of the charge distribution inthe chain reveals that the charge transfer is backward: thepositive charge shifts in the opposite direction of the externalelectric field. Such a backward charge transfer (BCT) produces anopposite dipole, which makes the polarization negative. The effectof electron interaction on the BCT is illustrated. |
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| Keywords: | polymer chain exciton biexciton backward charge transfer |
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