Generalized Ellipsometry Measurements of Crystalline Thin Film and Bulk Tin Oxide

Jellison, Jr., Gerald E.; Hermann, Raphaël P.; Specht, Elliot D.; Boatner, Lynn A.; Zac Ward, T.; Herklotz, Andreas

doi:10.1002/pssa.202100378

Generalized Ellipsometry Measurements of Crystalline Thin Film and Bulk Tin Oxide

Journal Article · Mon Dec 06 23:00:00 EST 2021 · Physica Status Solidi. A, Applications and Materials Science

DOI:https://doi.org/10.1002/pssa.202100378· OSTI ID:1876344

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Martin Luther University Halle-Wittenberg, Halle (Germany)

Here, several bulk and thin-film crystals of SnO2 are grown and examined using generalized ellipsometry techniques. The bulk samples are grown using the chemical vapor transport technique and thin films of SnO2 are grown using the pulsed laser deposition technique. The bulk samples are examined using the two-modulator generalized ellipsometry microscope (2-MGEM) at normal incidence and the spectroscopic two-modulator generalized ellipsometer (2-MGE). The spectroscopic optical functions of tin oxide are then obtained using the 2-MGE from 1.46 to 6.2 eV. The material is highly birefringent, and the ordinary bandgap is less than the extraordinary band edge. 2-MGE measurements are also made on thin-film samples of crystalline tin oxide grown on sapphire and rutile, showing no cross polarization. Because of the complicated morphology of the tin oxide films grown on sapphire, the ellipsometry data are simulated using the Tauc–Lorentz model. Films grown on rutile had the optic axis perpendicular to the sample surface, but the film is strained, resulting in a more complicated ellipsometric spectrum. These films are modeled using the air/surface roughness/tin oxide/interface/rutile model, where the roughness and interface are modeled using the incomplete Beta function.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program; German Research Foundation (DFG)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1876344

Alternate ID(s):: OSTI ID: 1834441
OSTI ID: 23184306

Journal Information:: Physica Status Solidi. A, Applications and Materials Science, Journal Name: Physica Status Solidi. A, Applications and Materials Science Journal Issue: NA Vol. NA; ISSN 1862-6300

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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