Two planar conjugated copolymers poly2,8-|5 ,11-diisooctylindolo[3 ,2-b] carbazole| -4-,7-di[2,5-thiophene]-5,6-dioctyloxy-2,1 ,3-benzothiadiazole( QP-2) and poly2,8-j 5 , 11-dioctylindolo[3 ,2-b] earbaz-olej -4,7-di[2,5-thiophene]-5 ,6-dioctyloxy-2, 1 ,3-benzothiadiazole( QP-3 ) with main chain donor-acceptor alternating structures were synthesized and their photophysical and photovoltaic properties were investigated. Photovoltaic cells based on polymer QP-3 gave a power conversion efficiency (PCE) of 2. 59% , an open circuit voltagc( Voc) of 0. 72 V, a short circuit current density (/sc ) of 9. 24 mA/cm2, and a fill factor(FF) of 0. 38. The results show that the polymer without branched alkyl side group performs better and they have better crystallinity in solid film.%设计合成了主链为聚2,8-{5,11-二烷基吲哚[3,2-b]咔唑}-4,7-二[2,5-噻吩]-5,6-二.烷氧基-2,l,3-苯并噻二唑,具有不同侧链的2种平面型给-受体共轭聚合物(QP-2和QP-3),研究了其热学、光物理和光伏性质.用聚合物-PC71BM([6,6]-苯基C71丁酸甲酯)共混物作为活件层构筑了本体异质结聚合物太阳能电池.其中以QP-3为给体、以PC71BM为受体的光伏电池能量转换效率最高达到2.59％,开路电压为0.72 V,短路电流为9.24 mA/cm2,填充因子为0.38.XRD结果表明,平面型共轭聚合物具有较好的结晶性,原子力显微镜( AFM)显示平面型共轭聚合物易于发生微观相分离.
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