The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO2

Anna Wuttig, Jason W. Krizan, Jing Gu, Jessica J. Frick, Robert Joseph Cava, Andrew Bruce Bocarsly

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23 Scopus citations

Abstract

We report the tuning of CuFeO2 photoelectrodes by Mg doping and Cu deficiency to demonstrate the effects of carrier concentration on the photoresponse. Carrier type and concentration were quantitatively assessed using the Hall effect on pure, Mg-incorporated, and Cu-deficient pellets (CuFe1xMgxO2 and Cu1yFeO2, x = 0, 0.0005, 0.005, 0.02, and y = 0.005, 0.02) over the range of thermodynamic stability achievable using solid-state synthesis. The same samples were used in a photoelectrochemical cell to measure their photoresponse. We find that the material with the lowest p-type carrier concentration and the highest carrier mobility shows the largest photoresponse. Furthermore, we show that increasing the p-type carrier concentration and thus the conductivity to high levels is limited by the delafossite defect chemistry, which changes the majority carrier type from p-type to n-type near the Mg solubility limit (x = 0.05) and at high Cu defect concentrations.

Original languageEnglish (US)
Pages (from-to)165-171
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number1
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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