Anisotropy of the electron effective mass in rutile SnO 2 determined by infrared ellipsometry

Abstract Generalized infrared spectroscopic ellipsometry (GIRSE) was applied to Sb‐doped rutile SnO 2 (101) films grown by plasma‐assisted molecular beam epitaxy (PAMBE). Coupled longitudinal‐optical (LO) phonon–plasmon (LPP) modes for the two principal polarization directions of the optically aniso...

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Published inPhysica status solidi. A, Applications and materials science Vol. 211; no. 1; pp. 82 - 86
Main Authors Feneberg, Martin, Lidig, Christian, Lange, Karsten, White, Mark E., Tsai, Min Y., Speck, James S., Bierwagen, Oliver, Goldhahn, Rüdiger
Format Journal Article
LanguageEnglish
Published 01.01.2014
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Summary:Abstract Generalized infrared spectroscopic ellipsometry (GIRSE) was applied to Sb‐doped rutile SnO 2 (101) films grown by plasma‐assisted molecular beam epitaxy (PAMBE). Coupled longitudinal‐optical (LO) phonon–plasmon (LPP) modes for the two principal polarization directions of the optically anisotropic SnO 2 were identified and their frequencies were determined as a function of electron concentrations obtained by Hall effect measurements. The analysis of these modes yielded very accurate values for the plasma frequencies and finally the anisotropy of the electron effective masses as a function of carrier density. Comparison to Hall effect electron concentrations yielded a non‐parabolicity of the conduction band.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201330147