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The temperature dependence of the charge carrier density, mobility andSeebeck coefficient of melt-grown, bulk ZnGa2O4 single crystals was measuredbetween 10 K and 310 K. The electrical conductivity at room temperature isabout s = 286 S/cm due to a high electron concentration of n = 3.26*10^(19)cm^(-3), caused by unintenional doping. The mobility at room temperature is mu= 55 cm^2/Vs, whereas the scattering on ionized impurities limits the mobilityto mu =62 cm^2/Vs for temperatures lower than 180 K. The Seebeck coefficientrelative to aluminum at room temperature is S_(ZnGa2O4-Al) = (-125+-2) muV/Kand shows a temperature dependence as expected for degenerate semiconductors.At low temperatures, around 60 K we observed a maximum of the Seebeckcoefficient due to the phonon drag effect.

Charge carrier density, mobility and Seebeck coefficient of melt-grown bulk ZnGa2O4 single crystals