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Design and synthesis of small-molecules and polymers based on extended isoindigo for organic solar cells

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Authors

안광현

Advisor
조원호
Major
공과대학 재료공학부
Issue Date
2015-08
Publisher
서울대학교 대학원
Keywords
extended isoindgosmall moleculeconjugated copolymerKnoevenagel condensationorganic solar cells
Description
학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2015. 8. 조원호.
Abstract
New small molecules and conjugated copolymers based on extended isoindigo (eI) and oligothiophene (nT) were synthesized (eI-(T)2, eI-(2T)2, PeI-1T and PeI-3T) to investigate the photovoltaic properties of extended isoindigo unit. Extended isoindigo can be synthesized from two oxindoles and 2,2'-bithiophene-5,5'-dicarbaldehyde by a simple Knoevenagel condensation. Extended isoindigo shows weaker electron-accepting ability than isoindigo. Therefore the small molecules and copolymers based on extended isoindigo show up-shifted LUMO levels as compared to conventional isoindigo-based materials. Also extended isoindigo-based polymers exhibit a good p-p stacking due to perfectly planar structure of eI. The photovoltaic devices based on PeI-1T blended with PC61BM exhibits power conversion efficiency (PCE) of 4.07% with a Jsc of 11.86 mA/cm^2. Extended isoindigo could be a promising building block for efficient organic solar cells.
Language
English
URI
https://hdl.handle.net/10371/123350
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