An A′–A–DA′D–A–A′-type acceptor enables organic solar cells with high VOC and low nonradiative voltage loss

A novel A′–A–DA′D–A–A′ typed acceptor was developed, where the benzotriazole unit was used as the A′ unit both on the central core and terminal groups, to reduce the voltage loss and to increase the open-circuit voltage in efficient organic solar cells.