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Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer

Cited 10 time in Web of Science Cited 9 time in Scopus
Authors
Lee, Jin Yong; Jo, Jea Woong; Jo, Won Ho
Issue Date
2015
Publisher
Elsevier
Citation
Organic Electronics, vol.20, pp. 125-131
Keywords
Polymer solar cellDiketopyrrolopyrroleConjugated polymerFluorination
Abstract
Low bandgap conjugated copolymers composed of thiophene-capped diketopyrrolopyrrole
and benzene with/without fluorination were synthesized to investigate the effect of fluorine
substitution on their photovoltaic properties. With increasing the number of substituted
fluorine atom on benzene, both HOMO and LUMO energy levels of the copolymer are
lowered and its crystallinity is increased. The fibril size of copolymer:PC71BM blend
becomes smaller as the number of substituted fluorine increases. As a result, the copolymer
with two fluorine substitution exhibits deeper HOMO energy level (5.30 eV), leading to
higher VOC (0.72 V), and also enhanced crystallinity (polymer chain packing), leading to
higher JSC (12.4 mA cm2
) as compared to mono- and non-fluorinated ones. The copolymer
with two fluorine atoms shows a promising power conversion efficiency of 5.63%.
Language
English
URI
https://hdl.handle.net/10371/94778
DOI
https://doi.org/10.1016/j.orgel.2015.02.008
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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