Bulk heterojunction (BHJ) polymer solar cells (PSCs) offer a promising, low-cost, large-area, flexible, light-weight, clean, and quiet alternative energy source for a variety of indoor and outdoor applications.However, their power conversion efficiencies (PCEs) and operational lifetimes must be improved to enable large-scale commercialization and implementation. In order to achieve high PCEs, BHJ materials capable of generating high short circuit current (Jsc) and large open circuit voltage (Voc) are required.One approach to increase Jsc and Vocis to develop low-band-gap semiconducting polymers with deeper highest occupied molecular orbital (HOMO) energies.An alternative approach is to develop new electron acceptors with higher lowest unoccupied molecular orbital (LUMO) energies.The pathway to low-band-gap semiconducting polymers with deeper HOMOs is now well established, and BHJ PSCs fabricated using these novel semiconducting polymers have demonstrated high PCEs.On the other hand, the development of novel electron acceptor is lacking behind the pace of the progress of development of PSCs. Here we report PSCs processed from BHJ composite incorporated with novel �electron donor-fullerene� conjugated molecules rather than fullerene derivatives, which exhibits enhanced efficiency in a single-junction device under simulated full sunlight. These results demonstrate that �electron donor-fullerene� conjugated molecules are promising electron accepters for PSCs with high efficiency.

Novel �electron donor-fullerene� conjugated molecules for polymer solar cells with an inverted device structure

246th National Meeting (2013)

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