An Indacenodithiophene-Quinoxaline Polymer Prepared by Direct Arylation Polymerization for Organic Photovoltaics

被引:68
作者
Chen, Shanshan [1 ]
Lee, Kyu Cheol [1 ]
Zhang, Zhi-Guo [2 ]
Kim, Dong Suk [3 ]
Li, Yongfang [2 ]
Yang, Changduk [1 ]
机构
[1] UNIST, Sch Energy & Chem Engn, Low Dimens Carbon Mat Ctr, Dept Energy Engn, Ulsan 689798, South Korea
[2] Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[3] Korea Inst Energy Res, KIER UNIST Adv Ctr Enery, Ulsan 689798, South Korea
基金
新加坡国家研究基金会;
关键词
OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; CONJUGATED POLYMERS; MOLECULAR-WEIGHT; EFFICIENCY; PERFORMANCE; DESIGN; AGGREGATION; DERIVATIVES; COPOLYMERS;
D O I
10.1021/acs.macromol.5b02324
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Seeking preparation of high-performance donor-acceptor (D-A) polymers based on bare thiophene units in a more environmentally friendly and faster way, we have carried out a direct arylation polymerization (DAP) of two starting beta-unprotected thiophene-containing monomers (indacenodithiophene (IDT) and thiophene-quinoxaline-thiophene (TQ)). Through modulating DAP time and heating method, the resulting IDT-TQpolymer shows a relatively well-defined structure with low content of structural defects, as demonstrated by high temperature H-1 NMR, MALDI-TOF-MS, and elemental analysis. Integrating this polymer into bulk-heterojunction solar cells with PC71BM can induce an enhanced OPV performance compared to the other structural analogues that retain a certain amount of unwanted structural defects. However, the film morphology and crystallinity are negligibly influenced by the degree of the structural defects. Through a combination of detailed electrical measurements using light intensity dependence and net photocurrent, we are able to correlate the different photovoltaic performances in structure-function relationships with the extent of the structural defects. Our study indicates that DAP is a promising asset for environmental production of many valuable thiophene-containing polymers for electroactive and photoactive applications.
引用
收藏
页码:527 / 536
页数:10
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