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Issue 23, 2017
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Enhancing the power conversion efficiency of polymer solar cells via selection of quinoxaline substituents

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Abstract

In this study, three random copolymers including quinoxaline derivatives with different substituent groups, 2,6-bis(trimethylstannyl)-4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b′]dithiophene and 4,7-dibromo-2-(2-octyldodecyl)-2H-benzo[d][1,2,3]triazole, were designed and synthesized according to the donor–acceptor (D–A) approach. 1H NMR spectroscopy, UV-Vis absorption spectroscopy, cyclic voltammetry, and gel permeation chromatography were utilized for the characterization of the polymers. Optical studies were performed in order to investigate the absorption behaviors of the polymers. P1, P2 and P3 demonstrate broad visible light absorption behavior with maximum absorption peaks around 374/539, 493/535 and 488/532 nm and their optical band gap values were calculated as 1.74, 1.87 and 1.70 eV respectively. Bulk heterojunction photovoltaic devices were fabricated using the synthesized polymers as electron donors with fullerene derivatives where the best power conversion efficiencies were found to be 2.03% for P1 : PC71BM (1 : 3, w : w), 2.22% for P2 : PC71BM (1 : 4, w : w) and 1.52% for P3 : PC71BM (1 : 2, w : w) with methanol treatment.

Graphical abstract: Enhancing the power conversion efficiency of polymer solar cells via selection of quinoxaline substituents

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Supplementary files

Article information


Submitted
01 Sep 2017
Accepted
30 Oct 2017
First published
30 Oct 2017

New J. Chem., 2017,41, 14635-14645
Article type
Paper

Enhancing the power conversion efficiency of polymer solar cells via selection of quinoxaline substituents

Ö. Karagaçtı, S. C. Cevher, G. Hizalan, S. O. Hacioglu, L. Toppare and A. Cirpan, New J. Chem., 2017, 41, 14635
DOI: 10.1039/C7NJ03312E

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