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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

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Authors
조제웅; 배승환; Liu, Feng; Russell, Thomas P.; 조원호
Issue Date
2014-10-06
Publisher
한국고분자학회
Citation
2014 추계학술대회 연구논문 초록집, vol.39, no.2, p.151
Keywords
공학
Abstract
Recently, polymers with fluorinated building block have recently attracted great interest because high power conversion efficiencies (PCEs) over 7% have been achieved by fluorination of A unit. In this work, we synthesized two kinds of D-A polymers with each being fluorinated on A and D unit, where quaterthiophene and benzothiadiazole are used as D and A unit, respectively, in order to investigate the effects of fluorination position on photophysical properties of polymers and their device performances of polymer solar cells. Although the fluorination on either D or A unit effectively enhances intermolecular interaction, exhibiting strong vibronic shoulder in UV?Visible absorption spectra, and lowers energy levels, retaining a low bandgap of 1.58 eV, the polymer with fluorinated D unit exhibits a PCE of 7.10%, while the polymer with fluorinated A unit exhibits a PCE of 6.75%. Therefore it can be concluded that the fluorination on D unit in D?A polymer is a very promising method for achieving high performance solar cells.
Language
English
URI
https://hdl.handle.net/10371/93380
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Others_재료공학부
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