Abstract
Two novel indacenodithiophene (IDT) based narrow band-gap polymers (PIDT-BDTDPP and PIDT-TDPP) with pendant diketopyrrolopyrrole (DPP) units onto different main chains were designed and synthesized. The structures and properties of these main chain donor-side chain acceptor D-A copolymers were fully characterized. The PIDT-TDPP with pendant DPP units onto thiophene (T) units exhibited better light-harvesting properties and charge transport properties. While the PIDT-BDTDPP with pendant DPP units onto benzo[1,2-b:4,5-b′]dithiophene (BDT) units displayed lower the highest occupied molecular orbital energy levels (HOMO). By blending these polymers as light-harvesting electron donors with (6,6)-phenyl-C61-butyric acid methyl ester (PC61BM) electron acceptors in bulk heterojunction solar cells, it was found that the PIDT-TDPP-based PSCs shown better photovoltaic performance and a power conversion efficiency (PCE) of 3.62%, an open-circuit voltage (VOC) of 0.79 V, a short-circuit current (JSC) of 9.27 mA cm−2 and a fill factor (FF) of 49.7% were achieved. The PCE level is 1.88 times higher than that in the PIDT-BDTDPP-based PSCs.
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