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Comparison of two D-A type polymers with each being fluorinated on D and A unit for high performance solar cells

Cited 108 time in Web of Science Cited 109 time in Scopus
Authors

Jo, Jea Woong; Bae, Seunghwan; Liu, Feng; Russell, Thomas P.; Jo, Won Ho

Issue Date
2015-01
Publisher
John Wiley & Sons Ltd.
Citation
Advanced Functional Materials, Vol.25 No.1, pp.120-125
Abstract
For the purpose of investigating the effect of fluorination position on D-A type conjugated polymer on photophysical and photovoltaic properties, two types of fluorinated polymere are synthesized, HF with fluorination on electron-donating unit and FH with fluorination on electron-accepting unit. Compared to non-fluorinated polymer, fluorinated polymers exhibit deeper HOMO energy levels without change of bandgap and stronger vibronic shoulder in UV-visible absorption, indicating that fluorination enhances intermolecular interaction. HF with fluorinated D unit exhibits well-developed fibril network, low bimolecular recombination and high hole mobility, which lead a high PCE of 7.10% in conventional single-junction solar cells, which is higher than the PCE (6.41%) of FH with fluorinated A unit. Therefore, this result demonstrates that fluorination on electron-donating unit in D-A polymers could be a promising strategy for achieving high performance polymer solar cells.
ISSN
1616-301X
Language
English
URI
https://hdl.handle.net/10371/94271
DOI
https://doi.org/10.1002/adfm.201402210
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