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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Institution: | 1. Research Center for Theoretical Physics and Research
Center for Quantum Manipulation, Fudan University, Shanghai 200433, China
;2. National Lab of Infrared Physics, Shanghai Institute of
Technical 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 the
dynamical process of the charge transfer in the polymer chain
induced by an external electric field E during forming
the biexciton. The time dependence of the charge distribution in
the chain reveals that the charge transfer is backward: the
positive charge shifts in the opposite direction of the external
electric field. Such a backward charge transfer (BCT) produces an
opposite dipole, which makes the polarization negative. The effect
of electron interaction on the BCT is illustrated. |
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Keywords: | polymer chain exciton biexciton backward charge transfer |
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