Electrochemical modification of the optical and electrical properties of Cd-rich NixCd1-xO alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Mimoza M. Ristova
  • Christopher Francis
  • Francesca M. Toma
  • Kin M. Yu
  • Wladislaw Walukiewicz

Detail(s)

Original languageEnglish
Pages (from-to)127-133
Journal / PublicationSolar Energy Materials and Solar Cells
Volume147
Publication statusPublished - 1 Apr 2016

Abstract

Enhancement of the optical and electrical properties of Cd-rich NixCd1-xO alloys was achieved through an electrochemical procedure - their biasing at a constant negative potential into an electrolyte. Depending on the conductivity of the film (correlated to x), the films changed their color from transparent-yellowish to black. For a certain bias, the coloration became permanent and irreversible. Electron concentration for some samples increased for better than two orders of magnitude upon the coloration, while as the mobility decreased for a factor of 2-10. Rutherford Back Scattering (RBS) analysis revealed oxygen deficiency for the colored samples. The XRD analysis showed that the coloration could be associated to a partial reduction of CdO2 to CdO. XPS analysis suggested complex red-ox transitions of the two Ni and two Cd-oxides within the alloy. Ni2p electrons suggested that a partial NiO (transparent) transition to Ni2O3 (black) is likely the responsible process for the occurrence of the intensive light trapping. Since the NixCd1-xO band gap is tunable with x, one may conclude that this electrochemical procedure is motivating for tuning/modification/enhancement of the both, the absorption and conductivity of NixCd1-xO films for their possible application as integrated film photoanodes (TCO and PEC cell in one) within a hybrid water splitting device.

Research Area(s)

  • Conductive oxide, Electrochemical coloration, Electron concentration, NixCd1-xO, Transmittance modification, XPS

Citation Format(s)

Electrochemical modification of the optical and electrical properties of Cd-rich NixCd1-xO alloys. / Ristova, Mimoza M.; Francis, Christopher; Toma, Francesca M.; Yu, Kin M.; Walukiewicz, Wladislaw.

In: Solar Energy Materials and Solar Cells, Vol. 147, 01.04.2016, p. 127-133.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review