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6,7-Dialkoxy-2,3-diphenylquinoxaline based narrow band gap conjugated polymers, poly[2,7-(9-octyl-9H-carbazole)-alt-5,5-(5,8-di-2-thinenyl-(6,7-dialkoxy-2,3-diphenylquinoxaline))] (PCDTQ) and poly[2,7-(9,9-dioctylfluorene)-alt-5,5-(5,8-di-2-thinenyl-(6,7-dialkoxy-2,3-diphenylquinoxaline))] (PFDTQ), have been synthesized by Suzuki polycondensation. Their optical, electrochemical, transport and photovoltaic properties have been investigated in detail. Hole mobilities of PCDTQ and PFDTQ films spin coated from 1,2-dichlorobenzene (DCB) solutions are 1.0 × 10-4 and 4.1 × 10-4 cm2V-1s-1, respectively. Polymer solar cells were fabricated with the as-synthesized polymers as the donor and PC61BM and PC71BM as the acceptor. Devices based on PCDTQ:PC71BM (1:3) and PFDTQ:PC71BM (1:3) fabricated from DCB solutions demonstrated a power conversion efficiency (PCE) of 2.5% with a Voc of 0.95 V and a PCE of 2.5% with a Voc of 0.98 V, respectively, indicating they are promising donor materials.
6,7-Dialkoxy-2,3-diphenylquinoxaline based narrow band gap conjugated polymers, poly [2,7- (9-octyl-9H- carbazole) -alt-5,5- (5,8-di-2- thinenyl - (6,7-dialkoxy-2,3-diphenylquinoxaline)] (PCDTQ) and poly [2,7- (9,9- dioctylfluorene) -alt-5,5- (5,8- di- 2 -thinenyl - (6,7-dialkoxy-2,3-diphenylquinoxaline)] (PFDTQ), have been synthesized by Suzuki polycondensation. Their optical, electrochemical, transport and photovoltaic properties have been investigated in detail. Hole mobilities of PCDTQ and PFDTQ films spin coated from 1,2-dichlorobenzene (DCB) solutions are 1.0 × 10-4 and 4.1 × 10-4 cm2V-1s-1, respectively. Polymer solar cells were fabricated with the as-synthesized polymers as the donor and PC61BM and PC71BM as (PCE) of 2.5% with a Voc of 0.95 V and a PCE of 2.5% with a Voc of 0.95 V and PCDTQ: PC71BM (1: 3) fabricated from DCB solutions demonstrated power conversion efficiency with a Voc of 0.98 V, respectively, indicating they are promising donor materials.