Comparison of Linear- and Star-Shaped Fused-Ring Electron Acceptors

被引：45

作者：

Cai, Guilong ^{[1
,2
]}

Wang, Wei ^{[2
]}

Zhou, Jiadong ^{[3
]}

Xiao, Yiqun ^{[4
]}

Liu, Kuan ^{[2
]}

Xie, Zengqi ^{[3
]}

Lu, Xinhui ^{[4
]}

Lian, Jiarong ^{[1
]}

Zeng, Pengju ^{[1
]}

Wang, Yiping ^{[1
]}

Zhan, Xiaowei ^{[2
]}

机构：

[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China

[2] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Key Lab Polymer Chem & Phys,Minist Educ, Beijing 100871, Peoples R China

[3] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

[4] Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China

来源：

ACS MATERIALS LETTERS | 2019年 / 1卷 / 03期

关键词：

ORGANIC SOLAR-CELLS; NON-FULLERENE ACCEPTOR; POLYMER; EFFICIENT; CORE; LAYER;

D O I：

10.1021/acsmaterialslett.9b00253

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A star-shaped nonfullerene electron acceptor, FBTIC, and a linear-shaped nonfullerene acceptor, FBDIC, with the same electron-deficient end groups and p-hexylphenyl side chains but different fused-ring electron-rich cores (benzotrithiophene and benzodithiophene) are designed, synthesized, and compared. Terminal groups 2FIC in FBTIC form intermolecular pi-pi stacking, leading to the complex 3D conjugated framework, while 2FIC units in FBDIC form double hydrogen bonding. Relative to that of FBDIC, FBTIC shows an 81 nm blue-shifted absorption, a 0.21 eV larger optical bandgap, a 0.13 eV lower highest occupied molecular orbital, a 0.1 eV higher lowest unoccupied molecular orbital, and double electron mobility. Paired with the donor PM6, the optimized PM6/FBDIC-based organic photovoltaic cells show an efficiency of 12.3%, while the cells based on PM6/FBTIC exhibit an efficiency of 10.1% with a fill factor of 75.4%, much better than those of the reported star-shaped fused-ring electron acceptors.

引用

页码：367 / 374

页数：15

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