采用Stilling偶合反应合成了噻吩-苯-噻吩和2，5-二（三甲基锡）基噻并[3，2-b]噻吩窄带隙交替共轭聚合物PTPT-bT（Eg＝2．03eV）。所得聚合物具有良好的热稳定性、溶解性及成膜性能。共聚物在四氢呋喃中和固体薄膜中的光致发光发射峰分别为566 nm和583nm。最高占有分子轨道（HOMO）和最低未占有分子轨道（LUMO）值分别为-5．29eV和-3．01eV。在模拟太阳光照AM1．5（89mW· cm-2）下，基于PTPT-bT：PC70 BM（1：4）共混膜的光伏器件的光电转换效率（PCE）为2．99％，开路电压（Voc）为0.80V，短路电流（Jsc）为6．97mA/cm2，填充因子为0．48。%The alternating narrow band -gap conjugated polymer PTPT -bT (Eg =2.03eV) is synthesized, which derived from thiophene -phenylene-thiophene and 2, 5-bis (trimethylstannyl) thieno[3,2-b] thionphene by Stilling coupling reaction .In THF solution and solid thin film , PL emission peaks of the copolymer are around 566nm and 583nm respectively.The values of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) are -5.29eV and -3.01eV respectively.Under AM 1.5 simulator (89mW· cm-2), the photovotaic devices based on PTPT -bT:PC70 BM(1:2) blend ITO/PEDOT:PSS/PTPT-bT:PC70 BM/Ba/Al show power conversion efficiency (PCE) of 2.99%, an open circuit voltage(Voc) of 0.80 V, a short circuit cur-rent (Isc) of 6.97mA/cm2 and a fill factor (FF) of 48%.
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