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Despite the recent rapid development of organic solar cells (OSCs), the low dielectric constant (ϵr =3-4) of organic semiconducting materials limits their performance lower than inorganic and perovskite solar cells. In this work, we introduce oligethylene glycol) (OEG) side chains into the dicyanodistyrylbenzene-based non-fullerene acceptors (NIDCS) to increase its ϵr up to 5.4. In particular, a NIDCS acceptor bearing two triethylene glycol chains (NIDCS-EO3) shows VOC as high as 1.12 V in an OSC device with a polymer donor PTB7, whi
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