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Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer
Cai, Mian1,2; Bao, Xichang1; Liu, Yan Fang1; Li, Chenchen1,2; Wang, Xiao1; Lan, Zhenggang1; Yang, Renqiang1; Wan, Xiaobo1,2; Zhenggang Lan,Renqiang Yang and Xiaobo Wan
2017-11-14
发表期刊CHEMISTRY OF MATERIALS
卷号29期号:21页码:9162-9170
摘要Fluorination density and regioregularity are known factors that have high impact on the performance of organic solar cells; however, due to the limited available fluorination positions, the influence of backbone fluorination positions (such as ortho, para, and meta) has not been well studied. Here we disclose that the fluorination position on a conjugated polymer backbone may have completely opposite effects on its performance. Specifically, compared to the nonfluorinated control, Devices fabricated with the conjugated polymer based on para-fluorinated dibenzo[c,h][2,6]-naphthyridine-5,11-(6H,12H)-dione (DBND) block exhibit improved power conversion efficiencies (PCEs) up to 6.55%, while devices fabricated with the conjugated polymer based on ortho-fluorinated DBND block exhibit much worse PCEs as low as 1.44%, although both polymers have similar HOMO/LUMO levels, bandgaps, and backbone torsion angles. It is found that different fluorination positions result in different dipole moments, intermolecular binding energies, and syn/anti conformer ratios, which eventually lead to the distinct phase-separation behaviors of the corresponding solar cells.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1021/acs.chemmater.7b03025
关键词[WOS]POWER CONVERSION EFFICIENCY ; HETEROJUNCTION SOLAR-CELLS ; DONOR-ACCEPTOR POLYMERS ; BUILDING-BLOCK ; ELECTRONIC-PROPERTIES ; EXCEEDING 9-PERCENT ; COPOLYMERS ; DERIVATIVES ; ISOINDIGO ; DESIGN
收录类别SCI
语种英语
WOS研究方向Chemistry ; Materials Science
项目资助者National Science Foundation of China(NSFC51573204 ; Youth Innovation Promotion Association CAS(2016194) ; 21402220 ; 21607164 ; 51573205)
WOS类目Chemistry, Physical ; Materials Science, Multidisciplinary
WOS记录号WOS:000415911600028
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文献类型期刊论文
条目标识符http://ir.qibebt.ac.cn/handle/337004/9826
专题先进有机功能材料研究组
通讯作者Zhenggang Lan,Renqiang Yang and Xiaobo Wan
作者单位1.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, 189 Songling Rd, Qingdao 266101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Cai, Mian,Bao, Xichang,Liu, Yan Fang,et al. Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer[J]. CHEMISTRY OF MATERIALS,2017,29(21):9162-9170.
APA Cai, Mian.,Bao, Xichang.,Liu, Yan Fang.,Li, Chenchen.,Wang, Xiao.,...&Zhenggang Lan,Renqiang Yang and Xiaobo Wan.(2017).Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer.CHEMISTRY OF MATERIALS,29(21),9162-9170.
MLA Cai, Mian,et al."Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer".CHEMISTRY OF MATERIALS 29.21(2017):9162-9170.
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