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Effect of Fluorine Substitution and Position on Phenylene Spacer in Carbazole Based Organic Sensitizers for Dye Sensitized Solar Cells

Abstract

A series of organic dyes having a carbazole donor, cyanoacrylic acid as acceptor, and phenylene ring as a spacer with difference in fluorine substitution positions are reported. Due to their unique properties of small size and high electronegativity, fluorine is now being extensively used to control the optoelectronic properties of organic conjugated materials. In this work, it is revealed that varying the specific position and number of fluorine substitution is very crucial to control the optical as well as electrochemical properties of organic dyes. It is found that fluorine substitution leads to redshift in absorption spectra of the dyes and reduced band gap. The injection rate of photoexcited electrons was measured using time-resolved photoluminescence and o-fluoro substituted dye MA1F-o showed the best electron injection dynamics. As a result of broad absorption and high electron injection rate, dye MA1F-o outperformed other dyes with a power conversion efficiency of 4.02 % (Jsc = 8.3 mA/cm2, Voc = 0.75 V and FF = 0.64). The non-fluorinated dye MA0F exhibited a power conversion efficiency of 3.23 % (Jsc = 6.8, Voc = 0.72 and FF = 0.67). Dye MA1F-m had the least molar absorption coefficient and lower power conversion efficiency because of meta inductive effect.

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Publication details

The article was received on 02 Aug 2017, accepted on 05 Oct 2017 and first published on 05 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05226J
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Effect of Fluorine Substitution and Position on Phenylene Spacer in Carbazole Based Organic Sensitizers for Dye Sensitized Solar Cells

    M. A. Afroz, K. K. Sonigara, T. Bhim Raju, S. S. Soni and P. K. Iyer, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05226J

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