All-polymer solar cells based on a blend of poly3-(10-n-octyl-3-phenothiazine-vinylene)thiophene-co-2,5-thiophene and poly1,4-dioctyloxyl-p-2,5-dicyanophenylenevinylene

We report all-polymer solar cells (PSCs) based on a polymer blend of poly3-(10-n-octyl-3-phenothiazine-vinylene)thiophene-co-2,5-thiophene as donor and poly1,4-dioctyloxyl-p-2,5-dicyanophenylenevinylene as acceptor. Strong photoluminescence quenching is observed in the polymer blend indicating the photoinduced charge transfer occurs between the two polymers. The power conversion efficiency of the PSC was improved from 0.41% to 0.8% after 120 °C postannealing, under the illumination of AM 1.5, 100 mW/cm2. We attribute the improved efficiency to better morphological features of the photoactive layer after thermal annealing.