Unassisted Water Splitting Exceeding 9% Solar-to-Hydrogen Conversion Efficiency by Cu(In, Ga)(S, Se)2 Photocathode with Modified Surface Band Structure and Halide Perovskite Solar Cell

Bonhyeong Koo, Daehan Kim, Passarut Boonmongkolras, Seong Ryul Pae, Segi Byun, Jekyung Kim, June Hyuk Lee, Dong Hoe Kim, Suncheul Kim, Byung Tae Ahn, Sung Wook Nam, Byungha Shin

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

By introducing ZnS between Cu(In, Ga)(S,Se)2 (CIGS) and the CdS, we greatly improved the photoelectrochemical (PEC) performance of the CIGS photocathode for hydrogen evolution. Chemical and structural analysis reveals that the enhanced performance is due to additional band bending driven by in-diffusion of Zn into the CIGS and suppression of nonradiative recombination. The improved onset potential of CIGS photocathode was exploited by building a tandem device with a perovskite absorber for bias-free water splitting. A PEC device with a solar-to-hydrogen conversion efficiency exceeding 9% (the highest among PEC cells including a CIGS photocathode) with a stable operation of 6.5 h is demonstrated.

Original languageEnglish
Pages (from-to)2296-2303
Number of pages8
JournalACS Applied Energy Materials
Volume3
Issue number3
DOIs
Publication statusPublished - 2020 Mar 23
Externally publishedYes

Keywords

  • Cu(In, Ga)(S, Se) photocathode
  • perovskite solar cell
  • solar-to-hydrogen
  • surface band bending
  • unassisted solar water splitting

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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