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Issue 36, 2013

Structure-property relationship of different electron donors: new organic sensitizers based on bithiazole moiety for high efficiency dye-sensitized solar cells

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Abstract

Three metal-free bithiazole organic dyes (BTT-I–III) based on D–A-π-A building blocks were designed and synthesized for dye-sensitized solar cells (DSSCs) to study the influence of different electron donors on photovoltaic properties, in which the electron donors of BTT-I–III were carbazole, triphenylamine and indoline moieties, respectively. The UV/Vis absorption spectra of BTT-III containing indoline as electron-donor displayed red-shifted absorption compared to the other two dyes with an onset close to 700 nm. The incident photon-to-current conversion efficiency (IPCE) spectra of BTT-III showed a wide region and kept a value higher than 10–15% during 580–650 nm. Electrochemical measurement data indicated that the HOMO and LUMO energy levels could be tuned through introducing different electron-donors in the dye molecule. It was found that the overall conversion efficiency of indoline donor based dye BTT-III showed the highest efficiency of 7.86% under AM 1.5 irradiation (100 mW cm−2). The electron lifetime calculated from electrochemical impedance spectroscopy (EIS) measurement demonstrated the reduced charge recombination and the higher open-circuit voltage.

Graphical abstract: Structure-property relationship of different electron donors: new organic sensitizers based on bithiazole moiety for high efficiency dye-sensitized solar cells

Article information


Submitted
14 Jan 2013
Accepted
19 Jun 2013
First published
25 Jun 2013

RSC Adv., 2013,3, 15900-15908
Article type
Paper

Structure-property relationship of different electron donors: new organic sensitizers based on bithiazole moiety for high efficiency dye-sensitized solar cells

F. Guo, J. He, S. Qu, J. Li, Q. Zhang, W. Wu and J. Hua, RSC Adv., 2013, 3, 15900 DOI: 10.1039/C3RA00181D

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