Journal of Industrial and Engineering Chemistry, Vol.34, 66-75, February, 2016
Effect of side chain position and conformation of quinacridone-quinoxaline based conjugated polymers on photovoltaic properties
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Poly[quinacridone-alt-dithienylquinoxaline](PQCDTQx)s series with alkoxy chains at different anchoring positions (meta- or para-) in quinoxaline were synthesized via Suzuki coupling reaction. The ICT effects were stronger at the meta than para. Meta-polymers had enhanced ∏-∏ stacking of the polymer main chains and showed a lower HOMO energy level than those of the para, from -5.26 to -5.16 eV, because of the greater electron-withdrawing effects of the alkoxy groups. As a result, the photovoltaic device comprising a PQCDTQx-mEH/PC71BM (1:4) blend system exhibited performance, with a PCE, JSC, VOC, and FF of 2.1%, 4.8 mA/cm2, 0.73 V, and 59.3%, respectively.
Keywords:Quinacridone;Quinoxaline;Side-chain;Suzuki coupling reaction;Bulk heterojunction polymer solar cells
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