A non-fullerene all small molecule solar cell constructed with a diketopyrrolopyrrole-based acceptor having a power conversion efficiency higher than 9% and an energy loss of 0.54 eV

作者：Privado Maria; de la Cruz Pilar; Biswas Subhayan; Singhal Rahul; Sharma Ganesh D^*; Langa Fernando^*

来源：Journal of Materials Chemistry A, 2018, 6(25): 11714-11724.

DOI：10.1039/c8ta02633e

The synthesis of a new symmetrical A-D-pi-A-D-pi-A non-fullerene small molecule acceptor MPU3 is reported. MPU3 consists of a diketopyrrolopyrrole (DPP) central acceptor core coupled to terminal dicyanorhodanine acceptors via a thiophene donor and an ethynyl linker. The optical and electrochemical properties of this compound were investigated. MPU3 showed strong absorption in the 600-850 nm range with an optical bandgap of 1.52 eV and the material was used as an acceptor for the fabrication of solution-processed bulk heterojunction organic solar cells using an A-D-pi-A-D-pi-A small molecule donor (SMD) consisting of a 5,10-dihydroindolo[ 3,2-b]indole (DINI) central donor core and benzothiadiazole (BT) acceptor units. This donor has a complementary absorption profile to MPU3. The organic solar cell based on an optimized an SMD: MPU3 active layer afforded overall power conversion efficiencies as high as 9.05%, which is higher than that obtained with an organic solar cell using PC71BM as the acceptor (5.80%) fabricated under identical conditions. Interestingly, the energy loss in the organic solar cell based on SMD: MPU3 is very low, 0.54 eV, when compared to its SMD: PC71BM counterpart (1.02 eV). Low energy loss is an essential feature to achieve high PCE values in organic solar cells.

• 出版日期2018-7-7