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Effect of Fluorine Substitution on Photovoltaic Performance of DPP-based Copolymer for Polymer Solar Cell
고분자 태양전지에 사용되는 DPP 기반 고분자의 불소 치환이 광전지 성능에 미치는 효과

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Authors
이진용
Advisor
조원호
Major
공과대학 재료공학부
Issue Date
2015-02
Publisher
서울대학교 대학원
Keywords
polymer solar cell
Description
학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2015. 2. 조원호.
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 cm-2) 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/10371/123332
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Theses (Master's Degree_재료공학부)
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