Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells

Yuan Jay Chang, Po Ting Chou, Yan Zuo Lin, Motonori Watanabe, Chih Jen Yang, Tsung Mei Chin, Tahsin J. Chow

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Abstract

A series of organic dyes containing oligo-phenothiazine were synthesized and used effectively on the fabrication of dye-sensitized solar cells (DSSCs). In these compounds the phenothiazine moiety functions both as an electron donor and as a π-bridge. These materials exhibit considerably high values of open-circuit voltage (V oc) ranging from 0.78-0.83 V under an AM1.5 solar condition (100 mW cm -2). Two kinds of substituents, i.e., hexyl and hexyloxyphenyl groups, were added onto the N(10) of phenothiazine for comparison. The best device displayed a short-circuit current (J sc) of 14.3 mA cm -2, an open-circuit voltage (V oc) of 0.83 V, a fill factor (FF) of 0.65, corresponding to an overall conversion efficiency of 7.78%. Their photophysical properties were analyzed with the aid of a time-dependent density functional theory (TDDFT) model with the B3LYP functional. The electronic nature of the devices was further elucidated by using electrochemical impedance spectroscopy.

Original languageEnglish
Pages (from-to)21704-21712
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number40
DOIs
Publication statusPublished - Oct 28 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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    Chang, Y. J., Chou, P. T., Lin, Y. Z., Watanabe, M., Yang, C. J., Chin, T. M., & Chow, T. J. (2012). Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells. Journal of Materials Chemistry, 22(40), 21704-21712. https://doi.org/10.1039/c2jm35556f