Abstract
Seeking preparation of high-performance donor–acceptor (D–A) polymers based on bare thiophene units in a more environmentally friendly and faster way, we have carried out a direct arylation polymerization (DAP) of two starting β-unprotected thiophene-containing monomers (indacenodithiophene (IDT) and thiophene–quinoxaline–thiophene (TQ)). Through modulating DAP time and heating method, the resulting IDT–TQ polymer shows a relatively well-defined structure with low content of structural defects, as demonstrated by high temperature 1H NMR, MALDI-TOF-MS, and elemental analysis. Integrating this polymer into bulk-heterojunction solar cells with PC71BM can induce an enhanced OPV performance compared to the other structural analogues that retain a certain amount of unwanted structural defects. However, the film morphology and crystallinity are negligibly influenced by the degree of the structural defects. Through a combination of detailed electrical measurements using light intensity dependence and net photocur...
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