Photovoltaic performances of two alternating polymers having meta-octyloxy-phenyl modified dithieno[3,2-f:2′,3′-h]quinoxaline unit

Terpolymer Containing a meta-Octyloxy-phenyl-Modified Dithieno[3,2-f:2′,3′-h]quinoxaline Unit Enabling Efficient Organic Solar Cells

“…Recently, to explore promising alternating polymers with new structures, meta-octyloxy-phenyl-modified dithieno[3,2-f:2′,3′h]quinoxaline-based D−A polymers were synthesized in our group. 40 The adopted meta-octyloxy-phenyl-modified dithieno-[3,2-f:2′,3′-h]quinoxaline structure in polymers not only offered deepened HOMO energy levels to achieve better V OC in devices but also had the advantage of multiple substitution sites for further structural modification, suggesting that this segment should have the potential as the proper electron-deficient segment to construct proper D−A polymer donors for OSCs. Encouraged by the promising results of the alkoxy phenylmodified dithieno[3,2-f:2′,3′-h]quinoxaline-based copolymers, in this manuscript, we prepared a series of PM6-based terpolymers having a meta-octyloxy-phenyl-modified dithieno-[3,2-f:2′,3′-h]quinoxaline (C12T-TQ) unit as the third component.…”

“…6 All other chemicals were purchased as reagent grade from Aladdin, J & K, and Alfa Aesar Chemical Co., and used without further purification unless otherwise noted. The 6,9dibromo-2,3-bis((3-octyloxy)phenyl)dithieno[3,2-f:2′,3′-h]quinoxaline (TQ-Br) 40 and the (4-(2-butyloctyl)thiophen-2-yl)trimethylstannane (compound 1) were synthesized according to the literature. The synthetic routes and chemical structures of the polymers are shown in Scheme 1.…”

“…Recently, to explore promising alternating polymers with new structures, meta -octyloxy-phenyl-modified dithieno­[3,2- f :2′,3′- h ]­quinoxaline-based D–A polymers were synthesized in our group . The adopted meta -octyloxy-phenyl-modified dithieno­[3,2- f :2′,3′- h ]­quinoxaline structure in polymers not only offered deepened HOMO energy levels to achieve better V OC in devices but also had the advantage of multiple substitution sites for further structural modification, suggesting that this segment should have the potential as the proper electron-deficient segment to construct proper D–A polymer donors for OSCs.…”