Small molecule donors based on benzodithiophene and diketopyrrolopyrrole compatible with both fullerene and non-fullerene acceptors†
Herein, two small molecule donors, BDTTT-DPP and BDTTVT-DPP, compatible with both fullerene and non-fullerene acceptors were developed. Both molecules exhibited medium bandgaps with complementary absorption to and appropriate energy level offsets with typical acceptors like PC61BM and IDIC. The optimized devices showed the best power conversion efficiency (PCE) of 5.53% for fullerene organic solar cells and 5.48% for non-fullerene organic solar cells. Moreover, ternary devices containing blends of the small molecule donors, IDIC and PC61BM produced PCEs of 6.53% for BDTTT-DPP cells and 6.55% for BDTTVT-DPP cells, even higher than the binary ones.
- This article is part of the themed collection: 2018 Journal of Materials Chemistry C HOT Papers