Cu(In,Ga)(S,Se)2 Photocathodes with a Grown-In CuxS Catalyst for Solar Water Splitting

Byungwoo Kim, Gi Soon Park, Yun Jeong Hwang, Da Hye Won, Woong Kim, Dong Ki Lee, Byoung Koun Min

Research output: Contribution to journalArticle

Abstract

As CuInGa-based chalcopyrite photocathodes suffer from poor hydrogen evolution activity, n-type overlayers and hydrogen evolution catalysts (HECs) need to be deposited on the film surface to drive surface band bending and reduce the overpotential for the hydrogen evolution reaction (HER). Here, we present a Cu(In,Ga)(S,Se)2 (CIGSSe) photocathode with grown-in CuxS HECs enabling solar water splitting without the deposition of additional n-type overlayers and HECs. The controlled two-step chalcogenization using a Cu-rich CuInGa precursor film resulted in the natural formation of the CuxS phase at the CIGSSe film surface and an increase in S content by substituting Se. Electrochemical water reduction tests elucidated that the naturally formed CuxS alters the surface state of CIGSSe and reduces the overpotential for HER. Also, the S incorporation allows fine-tuning to make the CIGSSe band gap favorable for solar water splitting. Consequently, the CIGSSe photocathode showed -25.7 mA·cm-2 photocurrent density and 3 h photostability for photoelectrochemical hydrogen evolution.

Original languageEnglish
Pages (from-to)2937-2944
Number of pages8
JournalACS Energy Letters
Volume4
Issue number12
DOIs
Publication statusPublished - 2019 Dec 13

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Photocathodes
Hydrogen
Catalysts
Water
Surface states
Photocurrents
Energy gap
Tuning

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this

Cu(In,Ga)(S,Se)2 Photocathodes with a Grown-In CuxS Catalyst for Solar Water Splitting. / Kim, Byungwoo; Park, Gi Soon; Hwang, Yun Jeong; Won, Da Hye; Kim, Woong; Lee, Dong Ki; Min, Byoung Koun.

In: ACS Energy Letters, Vol. 4, No. 12, 13.12.2019, p. 2937-2944.

Research output: Contribution to journalArticle

Kim, Byungwoo ; Park, Gi Soon ; Hwang, Yun Jeong ; Won, Da Hye ; Kim, Woong ; Lee, Dong Ki ; Min, Byoung Koun. / Cu(In,Ga)(S,Se)2 Photocathodes with a Grown-In CuxS Catalyst for Solar Water Splitting. In: ACS Energy Letters. 2019 ; Vol. 4, No. 12. pp. 2937-2944.
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