Abstract
Polycrystalline ZnIn 2Se 4 samples are grown on glass substrates and fluorine-doped tin oxide coated glass substrates using the selenization of radio-frequency magnetron sputtered Zn-In metal alloys. The effect of the [Zn]/[Zn + In] molar ratio in the metal alloys on the physical and photoelectrochemical properties of the samples is investigated. X-ray diffraction patterns of samples reveal that the samples are polycrystalline tetragonal ZnIn 2Se 4. The thicknesses and direct band gaps of the samples are in the ranges of 1.15-1.44 μm and 1.68-1.81 eV, as obtained from surface profile measurements and transmittance/reflectance spectra, respectively. The flat-band potentials of the samples in 0.6 M K 2SO 3 electrolyte are in the range of -0.41 to -0.95 V vs. an Ag/AgCl reference electrode. The highest photoelectrochemical response of samples was 1.84 mA/cm 2 at an external potential of +1.0 V vs. an Ag/AgCl electrode in 0.6 M K 2SO 3 solution under illumination from a 300 W Xe lamp system with the light intensity set at 100 mW/cm 2. Highlights: ZnIn 2Se 4 is deposited on substrates using selenization of of Zn-In precursors. All samples are polycrystalline tetragonal ZnIn 2Se 4. The direct energy band gaps of the samples were in the range of 1.68-1.81 eV. Sample with [Zn]/[Zn + In] ratio of 0.24 has a maximum PEC response.
Original language | English |
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Pages (from-to) | 13763-13769 |
Number of pages | 7 |
Journal | International Journal of Hydrogen Energy |
Volume | 37 |
Issue number | 18 |
DOIs | |
State | Published - 09 2012 |
Keywords
- Hydrogen production
- Magnetron sputtering
- Photoelectrode
- ZnIn Se