Semitransparent polymer solar cells with 9.06% efficiency and 27.1% average visible transmittance obtained by employing a smart strategy

A PCE of 9.48% and AVT of 23.7% are achieved from semitransparent PSCs with PTB7-Th : IEICO-4F (1.2 : 1.5, wt/wt) as the active layer. The AVT of semitransparent PSCs is increased to 27.1% with PTB7-Th : IEICO-4F (0.8 : 1.5, wt/wt) as the active layer with a PCE of 9.06%, corresponding to over 14.3% AVT improvement and less than 4.5% PCE loss.