含磺酰基的二维醌式窄带隙共聚物的制备与性能

Preparation and Properties of Two-dimensional Quinoidal Low Bandgap Copolymer Containing Sulfonyl Group

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 e V;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%。

A two-dimensional quinoidal low bandgap copolymer( PTTBDT-TTS,1) was synthesized by the Stille coupling polymerization in the presence of Pd2( dba)3 and 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 by1 H NMR,elemental analysis,GPC,UV-Vis,TGA and cyclic voltammetry. The results indicated that1 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 e V. The inverted photovoltaic cell based on1/PC61 BM reached a high open circuit voltage of 0. 95 V and a power conversion efficiency of 1. 07%.