PHPIT, a new kind of intramolecular donor–acceptor side-chain-tethered hexylphenanthrenyl-imidazole polythiophene is synthesized. The more-balanced electron and hole mobilities and the enhanced visible- and internal-light absorptions in the devices consisting of annealed PHPIT/PCBM blends both contribute to a much higher short-circuit current density, which in turn led to a power conversion efficiency as high as 4.1%.
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Chang et al. (2009) studied this question.
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