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题名: Side-Chain Isomerization on an n-type Organic Semiconductor ITIC Acceptor Makes 11.77% High Efficiency Polymer Solar Cells
作者: Yang, Yankang1, 3; Zhang, Zhi-Guo1; Bin, Haijun1, 3; Chen, Shanshan2; Gao, Liang1, 3; Xue, Lingwei1; Yang, Changduk2; Li, Yongfang1, 3, 4
刊名: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
发表日期: 2016-11-16
卷: 138, 期:45, 页:15011-15018
收录类别: SCI
英文摘要: Low bandgap n-type organic semiconductor (n-OS) ITIC has attracted great attention for the application as an acceptor with medium bandgap p-type conjugated polymer as donor in nonfullerene polymer solar cells (PSCs) because of its attractive photovoltaic performance. Here we report a modification on the molecular structure of ITIC by side-chain isomerization with meta-alkylphenyl substitution, m-ITIC, to further improve its photovoltaic performance. In a comparison with its isomeric counterpart ITIC with para-alkyl-phenyl substitution, m-ITIC shows a higher film absorption coefficient, a larger crystalline coherence, and higher electron mobility. These inherent advantages of m-ITIC resulted in a higher power conversion efficiency (PCE) of 11.77% for the nonfullerene PSCs with m-ITIC as acceptor and a medium bandgap polymer J61 as donor, which is significantly improved over that (10.57%) of the corresponding devices with ITIC as acceptor. To the best of our knowledge, the PCE of 11.77% is one of the highest values reported in the literature to date for nonfullerene PSCs. More importantly, the m-ITIC-based device shows less thickness-dependent photovoltaic behavior than ITIC-based devices in the active-layer thickness range of 80-360 nm, which is beneficial for large area device fabrication. These results indicate that m-ITIC is a promising low bandgap n-OS for the application as an acceptor in PSCs, and the side-chain isomerization could be an easy and convenient way to further improve the photovoltaic performance of the donor and acceptor materials for high efficiency PSCs.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/36513
Appears in Collections:有机固体实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Ulsan Natl Inst Sci & Technol, Low Dimens Carbon Mat Ctr, Sch Energy & Chem Engn, Dept Energy Engn, Ulsan 689798, South Korea
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Soochow Univ, Coll Chem Chem Engn & Mat Sci, Lab Adv Optoelect Mat, Suzhou 215123, Jiangsu, Peoples R China
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