Platinum-decorated Cu(InGa)Se2/CdS photocathodes: Optimization of Pt electrodeposition time and pH level

Min woo Kim, Hyun Yoon, Tae Yoon Ohm, Mukund G. Mali, Sung Kyu Choi, Hyunwoong Park, Salem S. Al-Deyab, Dong Chan Lim, Se Jin Ahn, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Photoelectrochemical (PEC) water splitting was performed using co-evaporated Cu(In,Ga)Se2(CIGS, p-type) films as the photocathode. Pt was electrodeposited on CIGS and CIGS/CdS films. The effect of the electrodeposition time was investigated to determine the optimal deposition conditions. The CIGS film was covered with a 60-nm-thick CdS layer (n-type) using a chemical-bath deposition technique, which created a p-n junction. The effect of the Pt electroplating time was again investigated for the CIGS/CdS films; thus, the effect of CdS addition could be quantitatively investigated. The effect of the pH of 0.5 M Na2SO4electrolyte was also investigated. The optimal water-splitting performance occurred at −24.16 mA/cm2at −0.7 V vs. Ag/AgCl with a Pt electrodeposition time of 20 min and pH 9. The CIGS/CdS films were characterized by X-ray diffraction, scanning electron microscopy, and focused-ion beam transmission electron microscopy.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalJournal of Alloys and Compounds
Volume692
DOIs
Publication statusPublished - 2017

Keywords

  • CIGS/CdS
  • Photocurrent
  • Platinum
  • Water splitting
  • p-n junction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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