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Anisotropy of the electron effective mass in rutile SnO 2 determined by infrared ellipsometry
Author(s) -
Feneberg Martin,
Lidig Christian,
Lange Karsten,
White Mark E.,
Tsai Min Y.,
Speck James S.,
Bierwagen Oliver,
Goldhahn Rüdiger
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330147
Subject(s) - ellipsometry , anisotropy , molecular beam epitaxy , rutile , effective mass (spring–mass system) , infrared , doping , materials science , electron , chemistry , condensed matter physics , analytical chemistry (journal) , optics , thin film , optoelectronics , physics , epitaxy , nanotechnology , organic chemistry , layer (electronics) , quantum mechanics , chromatography
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.