Fabrication of benzothiadiazole–benzodithiophene-based random copolymers for efficient thick-film polymer solar cells <i>via</i> a solvent vapor annealing approach

Abstract

We constructed a series of D–A₁–D–A₂ random polymers with broad light absorption and high carrier mobility. A PCE of over 4.52% was observed at a BHJ thickness of 270 nm, and over 5.60% at thicknesses of 100–170 nm.