Electrocatalytic activity of chemically deposited CuxS thin film for counter electrode in quantum dots-sensitized solar cells

Iseul Lim, Deok Yoon Lee, Supriya A. Patil, Nabeen K. Shrestha, Soon Hyung Kang, Yoon Chae Nah, Wonjoo Lee, Sung Hwan Han

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The compact (c-CuxS) and the porous (p-CuxS) with particle decorated films of coppersulfidearesynthesized using a chemical bath deposition technique, and the films are characterized using electrochemical techniques. In addition, the chemically deposited CuxS films are investigated as a counter electrode in quantum dots-sensitized solar cells (QSSCs). The available redox active reaction sites of the p-CuxS film are found to be 57.9% higher than those available in the c-CuxS film. From the electrochemical impedance spectroscopy, the effective diffusion coefficients of the polysulfide electrolyte in the c-CuxS and p-CuxS films are estimated to be 3.67 × 10-5 and 6.35 × 10-5 cm2 s-1, respectively. These results can be ascribed to the improvement in the available redox active reaction sites and the electrocatalytic activity of the CuxS counter electrode. As compared to the c-CuxS film, the p-CuxS film as a counter electrode exhibits an enhanced photovoltaic performance of the QSSCs with the power conversion efficiency of 3.17%, short-circuit current of 11.89 mA c-m2, open-circuit voltage of 0.50 V, and fill factor of 53.29. The improved performance of the QSSCs is ascribed to the improvements on the available redox active reaction sites, electrocatalytic activity and the diffusion coefficients, which are directly related to the surface morphology of the sulfide films.

Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalMaterials Chemistry and Physics
Volume148
Issue number3
DOIs
StatePublished - 2014

Keywords

  • Chemical synthesis
  • Electrochemical techniques
  • Nanostructures
  • Semiconductor

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