平面型给-受体共轭聚合物的合成及在体异质结聚合物太阳能电池中的应用

Planar Donor-acceptor Copolymers for Bulk Heterojunction Solar Cells

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-2,1,3-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)共混物作为活性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.

Two planar conjugated copolymers poly2,8-{5,11-diisooctylindolocarbazole}-4,7-di[2,5-thiophene]-5,6-dioctyloxy-2,1,3-benzothiadiazole（QP-2） and poly2,8-{5,11-dioctylindolocarbazole}-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 voltage（VOC） of 0.72 V,a short circuit current density（JSC） 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.