Growth of a WSe 2 /W counter electrode by sputtering and selenization annealing for high-efficiency dye-sensitized solar cells

Sajjad Hussain, Supriya A. Patil, Dhanasekaran Vikraman, Alvira Ayoub Arbab, Sung Hoon Jeong, Hak Sung Kim, Jongwan Jung

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

A chemically active and stable WSe 2 /W structure was prepared by sputtering and selenization annealing in order to replace a high-cost Pt counter electrode in dye-sensitized solar cells. The CV, EIS analysis, and Tafel curve measurements indicated that the WSe 2 /W electrode possesses high conductivity, low charge transfer resistance at the electrolyte-electrode interface, good electrocatalytic activity, and fast reaction kinetics for the a iodide/triiodide redox reaction, which are due to the synergistic effect of W and WSe 2 in combination. The DSSC with a novel WSe 2 /W counter electrode achieved a high power conversion efficiency of 8.22% under standard light illumination, which is comparable to that with a platinum (Pt)-coated FTO electrode (8.20%).

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalApplied Surface Science
Volume406
DOIs
StatePublished - 1 Jun 2017

Keywords

  • Counter electrode
  • DSSC
  • Sputtering
  • WSe2

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