The effect of donor-acceptor rod-coil diblock-copolymer as compatibilizer on the P3HT:PCBM polymer solar cells

Abstract

We find a substantial improvement in device performance by introducing 10% of diblock- copolymer P3HT-b-P(St89BAz11)-C60(P3HT=poly(3-hexylthiophene), St = styrene, BAz = benzyl azide) is introduced into the P3HT:PCBM blend system. The morphology of active layer is observed by an atomic force microscopy and the performance of solar cell devices are measured, resulting in ca. 15% improved efficiency relative to the P3HT:PCBM solar cell fabricated without the “P3HT-b-P(St89BAz11)-C60”. In addition, the diblock-copolymer additives employed as a compatibilizer to stabilize device the morphology of active layer against thermal phase segregation, which may also indicate a feasible strategy to improve the stability of the device.