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Title:
Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer
Author: Cai, Mian1,2; Bao, Xichang1; Liu, Yan Fang1; Li, Chenchen1,2; Wang, Xiao1; Lan, Zhenggang1; Yang, Renqiang1; Wan, Xiaobo1,2
Source: CHEMISTRY OF MATERIALS
Issued Date: 2017-11-14
Volume: 29, Issue:21, Pages:9162-9170
DOI: 10.1021/acs.chemmater.7b03025
Corresponding Author: Zhenggang Lan,Renqiang Yang and Xiaobo Wan
DOC Type: Article
English Abstract: 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.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Chemistry, Physical ; Materials Science, Multidisciplinary
WOS Subject Extended: Chemistry ; Materials Science
WOS Keyword Plus: POWER CONVERSION EFFICIENCY ; HETEROJUNCTION SOLAR-CELLS ; DONOR-ACCEPTOR POLYMERS ; BUILDING-BLOCK ; ELECTRONIC-PROPERTIES ; EXCEEDING 9-PERCENT ; COPOLYMERS ; DERIVATIVES ; ISOINDIGO ; DESIGN
Indexed Type: SCI
Funder: National Science Foundation of China(NSFC51573204 ; Youth Innovation Promotion Association CAS(2016194) ; 21402220 ; 21607164 ; 51573205)
Language: 英语
WOS ID: WOS:000415911600028
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/9826
Appears in Collections:先进有机功能材料团队_期刊论文

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description.institution: 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

Recommended Citation:
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.
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