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Synthesis and photovoltaic performances of high efficiencies conjugated copolymers with side groups
LI Haohao 1,LUO Hao 2,CAO Zhencai 3,GU Zhaojie 3,SHEN Ping 4,ZHAO Bin 4,CHEN Huajie 2,YU Gui 2,TAN Songting 4 * #
1.College of Chemistry, Xiangtan University, HuNan XiangTan 411105
2.Institute of Chemistry, Chinese Academy of Sciences, 100190
3.College of Chemistry, Xiangtan University, 411105
4.Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China(No.Nos. 20094301120005, 20104301110003), National Nature Science Foundation of China (No.Nos. 50973092, 51003089)
Opened online:14 September 2012
Accepted by: none
Citation: LI Haohao,LUO Hao,CAO Zhencai.Synthesis and photovoltaic performances of high efficiencies conjugated copolymers with side groups[OL]. [14 September 2012] http://en.paper.edu.cn/en_releasepaper/content/4488319
 
 
Three new copolymers (PT-TPA, PT-DTBT and PT-DTBTTPA) of benzo[1,2-b:4,5-b]dithiophene (BDT) and thiophene with different conjugated side chains (di(p-tolyl)phenylamine (TPA), 4,7-dithien-5-yl-2,1,3-benzodiathiazole (DTBT) and DTBT-TPA) were synthesized via the Stille coupling polymerization. The TPA and the DTBT were introduced to improve the hole-transport ability and broaden the absorption spectrum. The effects of different conjugated side groups on thermal, optical, electrochemical, hole-transporting and photovoltaic properties of these copolymers were investigated. It was found that the copolymer PT-DTBTTPA containing TPA and DTBT in the side chain showed the highest hole mobility. The three copolymers exhibit deep HOMO energy levels, which were effectively tuned by changing the side groups. Photovoltaic cells were fabricated with the synthesized copolymers as electron donors and [6,6]-phenyl-C-butyric acid methyl ester (PCBM) as the electron acceptor. Bulk heterojunction polymer solar cells based on PT-DTBT and PT-DTBTTPA showed promising power conversion e?ciencies of 5.50% and 5.16%, respectively.
Keywords:side chains; synthesis; polymer solar cells; photovoltaic performances
 
 
 

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