Modular TiO2-Squaraine Dyes/Electrolyte Interface for Dye-Sensitized Solar Cells with Cobalt Electrolyte

Ambarish Kumar Singh, Vediappan Sudhakar, Bharathkumar H. Javaregowda, Rajesh Bisht, Kothandam Krishnamoorthy, Jayaraj Nithyanandhan

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Strategies to diminish both charge recombination and aggregation of dyes on the photoanode by functionalizing the sensitizer with alkyl groups is the best approach to achieve high dye-sensitized solar cell (DSSC) efficiency. Development of such a photoanode with NIR-active dyes which is compatible with a cobalt electrolyte is important to enhance the photovoltaic performance. In this report, alkyl-group-wrapped donor-acceptor-donor (D-A-D) based unsymmetrical squaraine dyes have been used for DSSC device characterization with a cobalt electrolyte. Surface passivation of photoanode was varied systematically by the extent of functionalization with alkyl groups to avoid charge recombination. DSSC device performance of 5.92 % was achieved for an alkyl-group-wrapped squaraine dye with a cobalt electrolyte. Hence, appending the alkyl groups on the donor unit of squaraine dyes helps passivating the photoanode, whereas introducing hydrophilic groups provides a leaky surface where oxidized electrolyte species reach the titanium-metal-oxide surface which promotes the charge recombination process.

Original languageEnglish
Article numbere202200171
Issue number4
StatePublished - 1 Apr 2023
Externally publishedYes


  • DSSC device efficiency
  • counter-electrode
  • dye-sensitized solar cells
  • electrolytes
  • unsymmetrical squaraine dye

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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