Abstract
Optimization of polymeric/organic solar cells in both space (morphology) and energy (time) domains has been preliminarily examined, both experimentally and theoretically, in order to minimize the 'photon loss', the 'exciton loss' and the 'carrier loss'. In spatial domain optimization, for instance, thin films of the -donor-bridge-acceptor-bridge- (-DBAB-) type block copolymer exhibited much higher photoluminescence quenching and photoconductivity in comparison to corresponding donor/acceptor simple blend films under identical conditions. This enhancement of photoelectric conversion was attributed mainly to the improved bicontinuous morphologies in the -DBAB- block copolymer versus the donor/acceptor simple blend. In energy/time domain optimization, preliminary theoretical simulation reveals that, an optimum exciton-charge conversion can be achieved when the frontier orbital offset of donor/acceptor pair is close to the sum of exciton binding energy and the charge separation reorganization energy.
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