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


KARAGACTI O., CEVHER Ş. C. , HIZALAN G., HACIOGLU S. O. , TOPPARE L. , ÇIRPAN A.

NEW JOURNAL OF CHEMISTRY, cilt.41, ss.14635-14645, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 41 Konu: 23
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1039/c7nj03312e
  • Dergi Adı: NEW JOURNAL OF CHEMISTRY
  • Sayfa Sayıları: ss.14635-14645

Özet

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-dibromo2-(2-octyldodecyl)-2H-benzo[d][1,2,3] triazole, were designed and synthesized according to the donoracceptor (D-A) approach. H-1 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.