Photoelectrochemical properties of metal-cluster oxide compounds, A2Mo3O8 and (LiY)Mo3O8

Abstract

PEC studws on the single crystals of the metal-cluster oxide compounds, A2Mo30 ~ IA-Zn, Mg, Fcl, and polycrystalhne LiYMo30 ~ are reported. The photoresponse behaviour is attributed to the Mo d-d transition. The photopotential, the photocurrent vs applied voltage and the wavelength data indicate that n-Zn, Mo30 s is stable and possesses a small and redirect band gap of 1-55 eV and a direct band gap of 1.9 eV. With change in A ions in A2Mo~O 8, there is no significant change in the PEC properties. LiYMo30 ~ ~s found to be of p-type. PEC studies show that excepting fi)r poor electronic conductivity, A 2 Mo~Os possesses all the reqmmte characteristics of an ideal photoanode for PAE of water for trapping solar energy.

Optical Properties of Zn2Mo3O8: Combination of Theoretical and Experimental Study

“…Band gap of ZMO thin film was experimentally extracted from the Tauc plot (Figure ), which shows a direct optical band gap of 2.07 eV which matches closely with the observed value of 1.9 eV for monocrystalline ZMO . Although a lower value of 1.55 eV was also observed in the same article, it was not observed in our measurements.…”

“…This ensures that most of the transitions in the visible region of the spectrum have a d–d character. Finally, ZMO has been reported to have a indirect band gap of 1.55 eV and a direct gap of 1.9 eV . However, this report was not very conclusive about the band gap, as the quantum efficiency versus wavelength did not show any abrupt change in slope.…”

Polarization discontinuity driven two dimensional electron gas at A$_2$Mo$_3$O$_8$/B$_2$Mo$_3$O$_8$ (A, B : Zn,Mg,Cd) interfaces

“…1(c) shows that in all these compounds, the A 2+ cation does not contribute significantly to the states near the Fermi level. Moreover experimental observations also suggest that the photo-electrochemical properties of these materials are very similar [19]. Our results of orbital-resolved DOS are consistent with experimental observations.…”

“…We find that the sheet carrier density in these heterostructure systems to be similar to the conventional example systems like Al 1−x Ga x N/GaN or Zn 1−x Mg x O/ZnO [15,16]. Moreover, A 2 Mo 3 O 8 class of compounds has been also studied in the literature [19,20] as a potential photoabsorber. The optical gaps of these materials (∼ 2.0 eV) are suitable for absorbing significant fraction of solar radiation.…”

Influence of surface treatments on CdSe thin films in photoelectro-chemical solar energy conversion

“…Etching acts as deliberate corrosion as it removes selectivity, surface states and dislocations (Paranthaman et al 1980), thus favouring large improvements in PEC behaviour of the semiconductor electrodes. have found that etching of cadmium chalcogenide electrodes improves their efficiency and stability in polysulphide electrolyte.…”