The progress in all-polymer solar cells (all-PSCs) is often accompanied with morphology evolution of the light-harvesting layer. However, the regulation of the bulk-heterojunction (BHJ) morphology of the active layer often encounters obstacles, mainly because of the undesired miscibility of the polymer donor and acceptor. Here, we regulated the BHJ morphology of all-PSCs based on an electron-donating PBDB-T (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithio-phene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhex...
