Spontaneous solar water splitting by DSSC/CIGS tandem solar cells

Sang Youn Chae, Se Jin Park, Oh Shim Joo, Byoung Koun Min, Yun Jeong Hwang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


A tandem solar cell equipped with a dye-sensitized solar cell (DSSC) and a CuInxGa1−xSySe1−y (CIGS) bottom sub-cell was assessed for photovoltaic cell (PV)-assisted water splitting application. Two types of cobalt complexes ([Co(bpy)3]2+/3+ and [Co(phen)3]2+/3+) were tested as the redox couples in the DSSC sub-cell. Of these, [Co(phen)3]2+/3+ showed a larger open circuit potential and higher power conversion efficiency for the DSSC/CIGS tandem cell with high stability due to its more positive redox potential. Two unit cells of the DSSC/CIGS tandem cell were assembled as a module to supply sufficient power for water electrolysis. Spontaneous solar water splitting was realized when the DSSC/CIGS module was connected to a stainless steel anode and a platinum cathode. The [Co(phen)3]2+/3+ redox couple in the tandem cell was found to have high solar to hydrogen conversion efficiency (ηSTH = 4.65%) in the PV-assisted electrolysis cell.

Original languageEnglish
Pages (from-to)821-826
Number of pages6
JournalSolar Energy
Publication statusPublished - 2016 Oct 1


  • Cobalt based electrolyte
  • DSSC/CIGS tandem cell
  • PV-electrolysis
  • Stability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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