Efficient Polymer Solar Cells Based on a Low Bandgap Semi‐crystalline DPP Polymer‐PCBM Blends

Abstract

Solar cell performance and morphology characterization of a diketopyrrolopyrrole-based low bandgap polymer is reported. The polymer adopts an H-type aggregation and solvent mixture processing gives a better morphology. The morphology evolution is characterized by combined GIXD and GISAXS experiments and a four step morphology development mechanism is proposed.