Abstract
It is widely acknowledged the significant impact of narrow-bandgap non-fullerene acceptors (NFAs) in the field of organic electronics. However, most NFAs suffer from stability issues, attributed to their strong intra-molecular charge transfer interaction (ICT) effect and large conjugated plane. The exo-cyclic double bond between the end group and donor core is particularly susceptible. Herein, 4-IF4F and 6-IF4F were designed and synthesized with diverse configurations of π-bridge units to study the effect of non-covalent interaction on the photo-stability. Although the device based on 4-IF4F shows a slight low photovoltaic performance compared with 6-IF4F, the photostability of 4-IF4F is much better, attributed to its non-covalent interaction between the fluorine atom of the π-bridge and the hydrogen atom of the exocyclic double bond. Briefly, this work systematically investigated the incorporation of FTT units in NFAs and their photovoltaic performance, further demonstrating that it is a promising strategy by using non-covalent interaction to improve the stablility of narrow-bandgap NFAs.
Published Version
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