Synthesis and Characterization of New Non-Fullerene Accepter with Extended Conjugation for Organic Solar Cells
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ITIC non-fullerene acceptors (NFAs) and their derivatives with acceptor-donor-acceptor (A-D-A) architecture have drawn particular interest owing to broad light absorption, regulable energy levels, stable morphological, and low-cost synthesis potential. We design and characterize 9-heterocyclic ring non-fullerene acceptors (NFAs) with the extended backbone of indacenodithiophene by cyclopenta [2,1-b:3,4-b’] dithiophene (CPDT). Because of the electronegative nature of the end-group, the corresponding acceptors showed deeper LUMO energy levels and red-shifted ultraviolet absorption. The organic photovoltaic cells using novel NFAs with the halogen end groups fluorine or chlorine demonstrate better charge collection and faster exciton dissociation than photovoltaic cells using NFAs with methyl or lacking a substituent. Photovoltaic devices constructed from m-Me-ITIC with various end groups deliver power conversion efficiencies of 3.6–11.8%.