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Issue 11, 2011
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Understanding the p-type defect chemistry of CuCrO2

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Abstract

CuCrO2 is the most promising Cu-based delafossite for p-type optoelectronic devices. Despite this, little is known about the p-type conduction mechanism of this material, with both CuI/CuII and CrIII/CrIV hole mechanisms being proposed. In this article we examine the electronic structure, thermodynamic stability and the p-type defect chemistry of this ternary compound using density functional theory with three different approaches to the exchange and correlation; the generalized-gradient-approximation of Perdew, Burke and Ernzerhof (PBE), PBE with an additional correction for on-site Coulombic interactions (PBE + U) and the nonlocal, screened-exchange hybrid functional HSE06. The fundamental band gap of CuCrO2 is demonstrated to be indirect in nature. Under all growth conditions, the dominant intrinsic p-type defect will be the Cu vacancy, with hole formation centered solely on the Cu sublattice. Mg doping is found to be significantly lower in energy than intrinsic defect formation, explaining the large increases in conductivity seen experimentally. Cu-rich/Cr-poor growth conditions are found to be optimal for both intrinsic and extrinsic (Mg doping) defect formation, and should be adopted to maximize performance.

Graphical abstract: Understanding the p-type defect chemistry of CuCrO2

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Publication details

The article was received on 09 Nov 2010, accepted on 06 Jan 2011 and first published on 28 Jan 2011


Article type: Paper
DOI: 10.1039/C0JM03852K
Citation: J. Mater. Chem., 2011,21, 3655-3663
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    Understanding the p-type defect chemistry of CuCrO2

    D. O. Scanlon and G. W. Watson, J. Mater. Chem., 2011, 21, 3655
    DOI: 10.1039/C0JM03852K

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