Origins of infrared transparency in highly conductive perovskite stannate BaSnO.sub.3./sub.

0536217 - FZÚ 2021 RIV US eng J - Journal Article
Smirnov, Y. - Holovský, Jakub - Rijnders, G. - Morales-Masis, M.
Origins of infrared transparency in highly conductive perovskite stannate BaSnO₃.
APL Materials. Roč. 8, č. 6 (2020), s. 1-6, č. článku 061108. ISSN 2166-532X. E-ISSN 2166-532X
R&D Projects: GA ČR GA18-24268S
Institutional support: RVO:68378271
Keywords : transparent conductive oxide * Hall mobility * Drude model * barium stannate
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.096, year: 2020
Method of publishing: Open access

Near-infrared absorption in transparent conducting oxides (TCOs) is usually caused by electronic intraband transition at high doping levels. Improved infrared transparency is commonly explained by enhanced drift mobility in these TCOs. Here, an alternative cause behind the high infrared transparency of La-doped barium stannate (LBSO) transparent electrodes is presented. Following the Drude model formalism, we reconstructed spectrally resolved dielectric permittivity for a set of thin films with different free electron concentrations. A comparison of optical properties of LBSO with the tin-doped indium oxide thin films with identical carrier concentrations suggests that the redshift of the screened plasma wavelength for LBSO originates from its large high-frequency dielectric constant of 4.4, one of the highest reported for the s-orbital-based TCOs. Moreover, our measurements confirm an optical mobility significantly higher (>300 cm(2)/V s) than the drift mobility.
Permanent Link: http://hdl.handle.net/11104/0314037