Improving solubility and photovoltaic properties of the star-shaped molecules by synergistic effect of central tris(2-methoxyphenyl)amine and branched fluorine substituent

被引：2
|
作者：
Zhu, Mengbing [1 ]
Wang, Qiong [2 ]
Duan, Linrui [2 ]
Xia, Hao [1 ]
Zhang, Yingshuang [1 ]
Tong, Fei [1 ]
Peng, Wenhong [1 ]
Tan, Hua [1 ,2 ]
Zhu, Weiguo [1 ,2 ]
机构：
[1] Changzhou Univ, Jiangsu Engn Lab Light Elect Heat Energy Converti, Jiangsu Collaborat Innovat Ctr Photovolta Sci & E, Sch Mat Sci & Engn,Jiangsu Key Labs Environm Frie, Changzhou 213164, Jiangsu, Peoples R China
[2] Xiangtan Univ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Minist Educ, Xiangtan 411105, Peoples R China
来源：
DYES AND PIGMENTS | 2021年 / 186卷
基金：
中国国家自然科学基金;
关键词：
Star-shaped molecules; Small molecular donors; Solubility; Hole mobility; Organic solar cells; ORGANIC SOLAR-CELLS; PERFORMANCE; TRIPHENYLAMINE; CORE; DONOR; ACCEPTOR; OLIGOTHIOPHENES; SEMICONDUCTORS; EFFICIENCY; SYSTEMS;
D O I：
10.1016/j.dyepig.2020.109009
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Three star-shaped small molecular donors of TOBTC, TOBTC-1F and TOBTC-2F were developed, which adopt tris (2-methoxyphenyl)amine (TPA-OMe) as electron-donating core, as well as nonfluoro-, monofluoro- and difluoro-substituted benzo-thiadiazole as electron-withdrawing branch, respectively. The improved solubility and hole mobility were obtained in comparison to their analogs using TPA as core. More interestingly, the TOBTC-2F: PC71BM blend exhibited highest hole mobility (mu(h)) of 8.5 x 10(-4) cm(2)V(-1)s(-1) and its solution-processed organic solar cell displayed the best photovoltaic properties with a power conversion efficiency of 4.5% at an area of 10 mm(2) without any additive and annealing treatment. Here, the mu(h) value is 10 times higher than that of its TPA based analog:PC71BM blend. It indicates that the synergistic effect of the TPA-OMe unit in core and fluorine substituents in benzo-thiadiazole is available to improve solubility, mobility and photovoltaic properties of the star-shaped small molecular donors.
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页数：8
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