一种高迁移率聚合物太阳能电池材料的合成及其器件表征

doi:10.11944/j.issn.1000-0518.2016.12.160343

摘要/Abstract

摘要：

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(PC₇₁BM)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/PC₇₁BM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。

关键词: 聚合物太阳能电池, D-A型共聚物, 活性层, 厚膜

Abstract:

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(PC₇₁BM) 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.

Key words: polymer solar cells, donor-acceptor copolymer, active layer, thick film

杨大磊, 李泽林, 赵晓礼, 孙昭艳, 杨小牛. 一种高迁移率聚合物太阳能电池材料的合成及其器件表征[J]. 应用化学, 2016, 33(12): 1375-1382.

YANG Dalei, LI Zelin, ZHAO Xiaoli, SUN Zhaoyan, YANG Xiaoniu. Synthesis and Characterization of a High Hole Mobility Material for Polymer Solar Cells[J]. Chinese Journal of Applied Chemistry, 2016, 33(12): 1375-1382.

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