Abstract
Herein, two new 5,6-alt-benzothiadiazole-based Poly(o-arylene–vinylene) (POAV) type of D–π–A-conjugated copolymers, namely P1 and P2, have been synthesized using Horner–Wittig reaction and characterized by UV–Vis, 1H NMR, 13C NMR, and CV. With a deeper HOMO level of ≈ 5.95 eV, these two polymers have been used as donor with [6, 6]-phenyl C61-butyric acid methyl ester, PC61BM as an acceptor to fabricate solar cells with a device structure ITO/PEDOT:PSS/P1orP2-PCBM/Al or Ca:Al. Without annealing or use of additives, maximum V oc of 0.68, fill factor of 30.2%, quantum efficiency of 22%, and maximum power conversion efficiency (PCE) of 0.76% have been achieved with P2. Morphology of blended active layer, P1/P2 with PC61BM and PC71BM, has been investigated using AFM images.
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