A two-dimensional quinoidal low bandgap copolymer(PTTBDT-TTS,1)was synthesized by the Stille coupling polymerization in the presence of Pd 2(dba)3and P(o-tol)3,using benzo[1,2-b:4,5-b′]dithiophene and thieno[3,2-b]thiophene as copolymerization units,sulfonyl-substituted thieno [3,4-b]thiophene as conjugation side group.The structure and properties were characterized by 1 H NMR,elemental analysis,GPC,UV-Vis,TGA and cyclic voltammetry.The results indicated that 1 exhibited good film-forming ability and thermal stability.1 demonstrated absorption ranging from 300 nm to 800 nm and the HOMO energy level was -5.45 eV.The inverted photovoltaic cell based on 1/PC61BM reached a high open circuit voltage of 0.95 V and a power conversion efficiency of 1.07%.%以噻并[3,2-b]噻吩为共轭侧基,苯并[1,2-b :4,5-b′]二噻吩和磺酰基取代的噻并[3,4-b]噻吩为共聚单元,在Pd2(dba)3-P(o-tol)3催化下,经Stille缩聚反应合成了二维窄带隙醌式共聚物(PTTBDT-TTS,1),其结构和性能经1H NMR,元素分析,凝胶渗透色谱(GPC),UV-Vis,TGA和循环伏安法表征.结果表明:1具有良好的成膜性和热稳定性;1在300~800 nm对太阳光有较强吸收,HOMO能级为-5.45 eV;倒置光伏器件(1/PC61BM)的开路电压为0.95 V,能量转换效率约为1.07%.
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