High-efficiency organic solar cells enabled by nonfullerene acceptors with varying alkyloxy substitution positions of the phenyl outer side chains

Abstract

Two isomeric molecules named m-BTP-OEH and p-BTP-OEH were developed by attaching a 2-ethylhexyloxyl substituent at the meta- or para-position of its phenyl side chains and a PCE promotion from 17.23% to 18.02% was achieved.