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Fluorination on both D and A units in D-A type conjugated copolymers based on difluorobithiophene and benzothiadiazole for highly efficient polymer solar cells

Cited 147 time in Web of Science Cited 150 time in Scopus
Authors
Jo, Jea Woong; Jung, Jae Woong; Jung, Eui Hyuk; Ahn, Hyungju; Shin, Tae Joo; Jo, Won Ho
Issue Date
2015
Publisher
Royal Society of Chemistry
Citation
Energy & Environmental Science, vol.8, pp. 2427-2434
Abstract
Fluorination of conjugated polymers is one of the effective strategies to tune the frontier energy levels
for achieving high efficiency polymer solar cells. In this study, three fluorinated D–A polymers, consisting
of 3,30-difluoro-2,20-bithiophene and 2,1,3-benzothiadiazole (BT) with different numbers of fluorine
substitution, were synthesized in order to investigate the effect of fluorination on their photovoltaic
properties. The polymers with fluorinated BT show lower frontier energy levels, improved polymer
ordering, and a narrower fibril size in the blend with PC71BM. The polymer with mono-fluorinated BT
exhibits a superior PCE of 9.14% due to a high SCLC hole mobility, mixed orientation of polymer crystals
in the active layer, and low bimolecular recombination. This result demonstrates that the fluorine
content in conjugated polymers should be controlled for optimizing optoelectrical and photovoltaic
properties of fluorinated conjugated polymers.
Language
English
URI
https://hdl.handle.net/10371/94785
DOI
https://doi.org/10.1039/c5ee00855g
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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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