A Small Molecule Composed of Dithienopyran and Diketopyrrolopyrrole as Versatile Electron Donor Compatible with Both Fullerene and Nonfullerene Electron Acceptors for High Performance Organic Solar Cells

A new conjugated small molecule composed of dithienopyran and diketopyrrolopyrrole (DTP-DPP) was synthesized. Since DTP-DPP has advantageous optoelectronic properties for photovoltaic applications such as intense and broad light absorption, proper frontier energy levels, high crystallinity, and high hole mobility, the devices fabricated from the blend with PC71BM and P(NDI2OD-T2) exhibit high power conversion efficiencies of 6.88% and 4.82%, respectively. This work demonstrates that DTP-DPP is a versatile electron donor compatible with both fullerene and nonfullerene acceptors for high performance SM-OSCs.