设计合成了一种中等带隙共轭聚合物，聚[ N-（2-己基癸基）-2，2′-二噻吩-3，3′-二甲酰亚胺-交替共聚-5，5-（2，5-双（3-癸氧基噻吩）-2-噻吩基）-噻吩）]（PBTI3T-O），其光谱吸收覆盖波长从400 nm到720 nm，具有较宽的吸收范围，同时易溶于氯苯溶剂，利于溶液加工。 PBTI3T-O与[6，6]-苯基-C71-丁酸异甲酯（ PC71 BM）复合薄膜的空穴迁移率为5.90×10－3 cm2／（ V· s ），该迁移率高于其它大部分聚合物电池给体材料。由于PBTI3T-O较高的空穴迁移率，基于 PBTI3T-O／PC71 BM 的器件在活性层厚度为237 nm 时，效率可以达到5.56％。即使活性层膜厚进一步增加到约300 nm时，器件的效率仍能够保持其最高器件效率的97％，可见其具有在大面积加工工艺中的应用潜力。
One of the important prerequisites of large-area production is that the power conversion efficiency of polymer solar cells is insensitive to the active layer thickness .A novel donor-acceptor copolymer , named poly [N-(2-hexyldecyl)-2,2′-bithiophene-3,3′-dicarboximide-alt-5,5-(2,5-bis(3-(decyloxy) thiophene-2-yl)-thiophene)](PBTI3T-O),with a moderate band gap has been designed and synthesized .PBTI3T-O shows a broad absorption range of 400 ~720 nm and good solubility in chlorobenzene ( CB ) .The hole mobility of PBTI3T-O and [6,6]-phenyl-C71-butyric acid methyl ester ( PC71 BM) blend is 5.90 ×10 -3 cm2/( V· s), which is higher than those of most other materials .The excellent charge transport property leads to a power conversion efficiency of 5.56% with a thick active layer of 237 nm.Furthermore, PBTI3T-O based device retains 97%of the highest efficiency with a thickness of ca.300 nm, indicating its potential application in large-area production .
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