Abstract
We have performed optical transmission, reflection, spectroscopic ellipsometry, and Hall effect measurements on the electron-doped LaxBa1–xSnO3 (x = 0.04) transparent thin films. From the infrared Drude response and plasma frequency analysis we determine the effective mass of the conducting electron m* = 0.35m0. In the visible-UV region the optical band gap shifts to high energy in (La,Ba)SnO3 by 0.18 eV compared with undoped BaSnO3 which, in the context of the Burstein-Moss analysis, is consistent with the infrared-m*. m* of BaSnO3 is compared with other existing transparent conducting oxides (TCO), and implication on search for high-mobility TCO compounds is discussed.
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