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Fluorination of Polythiophene Derivatives for High Performance Organic Photovoltaics
Cited 138 time in
Web of Science
Cited 140 time in Scopus
- Authors
- Issue Date
- 2014-07
- Publisher
- American Chemical Society
- Citation
- Chemistry of Materials, Vol.26 No.14, pp.4214-4220
- Abstract
- For the purpose of examining the tuning of photophysical property by fluorine atom substitution, fluorinated and nonfluorinated poly(3,4-dialkylterthiophenes) (PDATs) were synthesized, and their photovoltaic properties were compared. Fluorinated PDATs exhibit a deeper highest occupied molecular orbital energy level than nonfluorinated ones, leading to higher open-circuit voltage in organic solar cells and also enhanced molecular ordering as evidenced by a vibronic shoulder in UV-vis spectra, pi-pi scattering in GIWAXS, and a well-developed fibril structure in TEM, which contributes to efficient charge transport. As a result, the fluorine substitution increases the power conversion efficiency by 20% to 250% as compared with nonfluorinated PDATs.
- ISSN
- 0897-4756
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