Asymmetric ITIC Acceptor for Asymmetric Benzodithiophene Polymer Solar Cells

In this work, one novel asymmetric non-fullerene acceptor ITIC-3T was designed and synthesized. ITIC-3T molecule shows 1.58 eV E-g, with -3.95 eV LUMO level. Utilizing P3 (one asymmetric 2D conjugated benzodi-thiophene polymer) as donor material, bulk heterojunction solar cells were fabricated. The optimal device yields a PCE of 6.47% with a V-OC of 0.64 V, a FF of 55.5% and a high J(SC) of 18.18 mA cm(-2), which may be attributed to the complementary optical absorption of active blend (P3 and ITIC-3T). In general, this work demonstrates that asymmetric polymer donor and non-fullerene acceptor active layer blend is potential for fabricating efficient photovoltaic cells.