p-type conductivity in wide-band-gap BaCuQF (Q=S,Se) Public Deposited

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Article appears in Applied Physics Letters ( http://apl.aip.org/) and is copyrighted by American Institute of Physics ( http://www.aip.org/).

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  • BaCuQF (Q=S,Se) materials, candidate transparent p-type conductors, were prepared by solid-state reaction, and their bulk electrical and optical properties were evaluated. The room-temperature Seebeck coefficient and electrical conductivity of undoped BaCuQF pellets were +56 μV/K and 0.088 S/cm, respectively, for the sulfide fluoride, and +32 μV/K and 0.061 S/cm, respectively, for the selenide fluoride. The conductivity was greatly enhanced by the substitution of several percent of K for Ba; the highest conductivities were 82 S/cm for Ba₀.₉K₀.₁CuSF and 43 S/cm for Ba₀.₉K₀.₁SeF. The band gaps for Q=S and Q=Se were measured to be 3.2 and 3.0 eV, respectively. Undoped BaCuSF exhibits strong red luminescence near 630 nm under ultraviolet excitation.
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  • Yanagi, H., Tate, J., Park, S., Park, C., & Keszler, D. A. (2003). P-type conductivity in wide-band-gap BaCuQF (Q=S,Se). Applied Physics Letters, 82(17), 2814-2816.
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