Citation: Zhen Lu, Cui-hong Li, Chun Du, Xue Gong, Zhi-shan Bo. 6,7-DIALKOXY-2,3-DIPHENYLQUINOXALINE BASED CONJUGATED POLYMERS FOR SOLAR CELLS WITH HIGH OPEN-CIRCUIT VOLTAGE[J]. Chinese Journal of Polymer Science, ;2013, 31(6): 901-911. doi: 10.1007/s10118-013-1275-y
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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.
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Keywords:
- Quinoxaline,
- Polymer solar cells,
- Photovoltaic performance,
- Carbazole,
- Fluorene
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