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

Yanagi, Hiroshi; Tate, Janet; Park, Sangmoon; Park, Cheol-Hee; Keszler, Douglas A.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2814
Academic Journal
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 Ba[SUB0.9]K[SUB0.1]CuSF and 43 S/cm for Ba[SUB0.9]K[SUB0.1]SeF. 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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