Abstract
The design, synthesis, characterization and photovoltaic properties of a small molecule (CDTCN) based on a heteroheptacene unit are presented. The incorporation of strong electron withdrawing 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile groups results in a decrease in the electron affinity of the heteroheptacene-based semiconductor and renders its decent electron transportation property. Organic solar cells using CDTCN as the acceptor material and a wide bandgap polymer (PBDB-T) as the donor material gave a high power conversion efficiency of 6.23% with a high open-circuit voltage of 0.96 V, a short-circuit current density of 11.26 mA cm−2 and a fill factor of 57.58%. The results demonstrate that the heteroheptacene is a promising electron donating core for constructing new non-fullerene acceptors with good performance.
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