Understanding the p-type conduction properties of the transparent conducting oxide CuBO(2): a density functional theory analysis

Reference:

Scanlon, D. O., Walsh, A. and Watson, G. W., 2009. Understanding the p-type conduction properties of the transparent conducting oxide CuBO(2): a density functional theory analysis. Chemistry of Materials, 21 (19), pp. 4568-4576.

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Official URL:

http://dx.doi.org/10.1021/cm9015113

Abstract

Discovering new candidate p-type transparent conducting oxides has become a major goal for material scientists. Recently delafossite CuBO(2) has been proposed as a promising candidate, showing good room temperature electrical conductivity and excellent transparency [Appl. Phys. Lett. 2007, 91, 092123]. In this article we report a density functional theory investigation of CuBO(2), examining the geometry and electronic structure using GGA corrected for on-site Coulomb interactions (GGA + U) and a hybrid density functional (HSE06). From analysis of the calculated band structure, density of states, and optical absorption, we predict an indirect fundamental band gap of similar to 3.1 eV and a direct optical band gap of similar to 3.6 eV. The hole effective mass at the valence band maximum indicates the potential for good p-type conductivity, consistent with the reported experimental results. These results are discussed in relation to other delafossite oxides.

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