Photoinduced partial charge transfer between conjugated polymer and fullerene in solutions

Hongzhen Lin; Yufeng Weng, Shuzaburo; Hongmin Huang; Qingguo He; Min Zheng; Fenglian Bai
April 2004
Applied Physics Letters;4/19/2004, Vol. 84 Issue 16, p2980
Academic Journal
Photoinduced charge transfer between a conjugated polymer and C60 and the related processes were investigated in dilute solutions. The substantial fluorescence quenching is correlated with the efficient exciton diffusion within the polymer chains, according to which a sphere-of-action mechanism is proposed. An emissive exciplex was found formed between the conjugated polymer and fullerene in a nonpolar solvent, indicating the occurrence of a photoinduced partial charge transfer process. The low-energy sites in the polymer are believed to play a crucial role in the partial charge transfer. The asymmetry of the exciplex provides a method for evaluating the tendency of photoinduced charge separation between the donor and the acceptor. This method allows screening candidates for photovoltaic applications. © 2004 American Institute of Physics.


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