Synthesis of two-dimensional π-conjugated polymers pendent with benzothiadiazole and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole moieties for polymer solar cells  

作　　者：Wei Li Qingduan Li Shengjian Liu Chunhui Duan Lei Ying Fei Huang Yong Cao 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices,South China University of Technology

出　　处：《Science China Chemistry》2015年第2期257-266,共10页中国科学（化学英文版）

基　　金：financially supported by the National Basic Research Program of China(2014CB643501);the National Natural Science Foundation of China(21125419 and 51361165301);the Guangdong Natural Science Foundation(S2012030006232);the Research Fund for the Doctoral Program of Higher Education of China(20120172140001)

摘　　要：Four new 2D donor–acceptor conjugated polymers were designed and synthesized.These new polymers comprised fluorenealt-triphenylamine or carbazole-alt-triphenylamine as the backbones,and pendants with 2,1,3-benzothiadiazole(BT)or naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole(NT)in a triphenylamine unit as the side groups.By changing the acceptor BT for a stronger electron-withdrawing unit of NT moiety in the side chain,the energy levels,absorption spectra,band gaps,and charge-transport abilities of the resultant polymers could be effectively tuned.Bulk heterojunction solar cells with these polymers as the electron donors and(6,6)-phenyl-C71-butyric acid methyl ester as the electron acceptor exhibited high open-circuit voltage(more than 0.8 e V).The power conversion efficiency can be improved from 1.37%to 3.52%by replacing the BT with an NT moiety,which indicates that introducing NT as the side-chain building block can be an effective strategy to construct efficient 2D conjugated polymers for PSCs.Four new 2D donor-acceptor conjugated polymers were designed and synthesized. These new polymers comprised fluorenealt-triphenylamine or carbazole-alt-triphenylamine as the backbones, and pendants with 2,1,3-benzothiadiazole （BT） or naph- tho[1,2-c：5,6-c]bis[1,2,5]thiadiazole （NT） in a triphenylamine unit as the side groups. By changing the acceptor BT for a stronger electron-withdrawing unit of NT moiety in the side chain, the energy levels, absorption spectra, band gaps, and charge-transport abilities of the resultant polymers could be effectively tuned. Bulk heterojunction solar cells with these polymers as the electron donors and （6,6）-phenyl-C71-butyric acid methyl ester as the electron acceptor exhibited high open-circuit voltage （more than 0.8 eV）. The power conversion efficiency can be improved from 1.37% to 3.52% by replacing the BT with an NT moiety, which indicates that introducing NT as the side-chain building block can be an effective strategy to construct efficient 2D conjugated polymers for PSCs.

关 键 词：two-dimensional conjugated polymer BENZOTHIADIAZOLE naphthobisthiadiazole bulkheterojunction polymer solar cell 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O633.5[理学—高分子化学]