Defect engineering of ZnS thin films for photoelectrochemical water-splitting under visible light

Fran Kurnia, Yun Hau Ng, Rose Amal, Nagarajan Valanoor, Judy Hart

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Efficient hydrogen production from water by photocatalysis under sunlight requires a significant improvement in light-harvesting capability. Zinc sulfide is a promising, inexpensive hydrogen generation photocatalyst, but in its pure, bulk form it is only active under ultra-violet light. Here, we show clear evidence of photoelectrochemical activity of ZnS thin films under visible-light irradiation without any co-catalysts, achieved through defect engineering. Fabrication of nanostructured ZnS under controlled conditions introduces defects, and hence intermediate electronic states within the band gap, which allow significant absorption of light at energies below the band gap energy of pure, bulk ZnS. The measured band gap of the ZnS thin films is ~2.4 eV, while the photocurrent density exceeds 1.5 mA/cm2 under visible-light irradiation (λ≥435 nm). This is the first measurement of such high photocurrents for undoped ZnS under visible light.
Original languageEnglish
Pages (from-to)179-185
JournalSolar Energy Materials & Solar Cells
Volume153
DOIs
Publication statusPublished - 01 Aug 2016

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Thin films
Defects
Water
Energy gap
Photocurrents
Irradiation
Zinc sulfide
Photocatalysis
Electronic states
Photocatalysts
Hydrogen production
Hydrogen
Fabrication
Catalysts

Cite this

Kurnia, Fran ; Ng, Yun Hau ; Amal, Rose ; Valanoor, Nagarajan ; Hart, Judy. / Defect engineering of ZnS thin films for photoelectrochemical water-splitting under visible light. In: Solar Energy Materials & Solar Cells. 2016 ; Vol. 153. pp. 179-185.
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Defect engineering of ZnS thin films for photoelectrochemical water-splitting under visible light. / Kurnia, Fran; Ng, Yun Hau; Amal, Rose; Valanoor, Nagarajan; Hart, Judy.

In: Solar Energy Materials & Solar Cells, Vol. 153, 01.08.2016, p. 179-185.

Research output: Contribution to journalArticle

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AU - Hart, Judy

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AB - Efficient hydrogen production from water by photocatalysis under sunlight requires a significant improvement in light-harvesting capability. Zinc sulfide is a promising, inexpensive hydrogen generation photocatalyst, but in its pure, bulk form it is only active under ultra-violet light. Here, we show clear evidence of photoelectrochemical activity of ZnS thin films under visible-light irradiation without any co-catalysts, achieved through defect engineering. Fabrication of nanostructured ZnS under controlled conditions introduces defects, and hence intermediate electronic states within the band gap, which allow significant absorption of light at energies below the band gap energy of pure, bulk ZnS. The measured band gap of the ZnS thin films is ~2.4 eV, while the photocurrent density exceeds 1.5 mA/cm2 under visible-light irradiation (λ≥435 nm). This is the first measurement of such high photocurrents for undoped ZnS under visible light.

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