Solution-processed bulk heterojunction solar cells based on a porphyrin small molecule with 7% power conversion efficiencyElectronic supplementary information (ESI) available. See DOI: 10.1039/c3ee43761b

A porphyrin small molecule with less bulky substituents at the porphyrin periphery has been synthesized as a donor material, which exhibits a power conversion efficiency of up to 7.23% under AM 1.5 G irradiation (100 mW cm −2 ) for the solution-processed bulk heterojunction solar cells with PC 61 BM as the acceptor material. Solution-processed BHJ solar cells based on a porphyrin small molecule as the donor material exhibit a PCE of up to 7.23%.