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In order to investigate the effect of thiophene spacers in backbone between electron-rich thieno[3,2-b]thiophene (TT) and electron-deficient benzothiadiazole (BT) units on the photovoltaic properties, novel two-dimensional (2-D) polymers with appending conjugated dioctylthiophene units in the 3,6-positions of TT were designed and synthesized, in which one or two thiophene spacers were embedded between...
Two-dimensional low band-gap copolymers of P1 and P2 with a framework of (2,5-di(thiophen-2-yl)thieno[3,2-b]thiophene)-alt-(2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione) (DTTT-alt-DTPP) were synthesized, in which two 2,3-dioctylthiophene-5-yl groups were pended into the 3-positions of two thiophenyl rings close to the thieno[3,2-b]thiophene (TT) unit for P1 and...
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