Asymmetric side-chain substitution enables a 3D network acceptor with hydrogen bond assisted crystal packing and enhanced electronic coupling for efficient organic solar cells

An asymmetric acceptor BTP-PhC6-C11 shows hydrogen bond assisted and tighter crystal packing and enhanced electronic coupling as compared with symmetric Y6 and BTP-PhC6, and organic solar cells based on PM1:BTP-PhC6-C11 realized a highest PCE of 18.33%.