Redshift and amplitude increase in the dielectric function of corundum-like α-(TixGa1-x)2O3

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Kluth, Elias and Fay, Michael and Parmenter, Christopher and Roberts, Joseph and Smith, Emily and Stoppiello, Craig and Massabuau, Fabien and Goldhahn, Rüdiger and Feneberg, Martin (2023) Redshift and amplitude increase in the dielectric function of corundum-like α-(TixGa1-x)2O3. Applied Physics Letters, 122 (9). 092101. 092101. ISSN 0003-6951 (https://doi.org/10.1063/5.0139725)

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Abstract

Redshift of the absorption onset and amplitude increase in the ultraviolet complex dielectric function (DF) of corundum like α-(TixGa1-x )2O3 with increasing Ti content is presented. α-Ga2O3 thin film samples alloyed with Ti up to x = 0.61 are grown from plasma enhanced atomic layer deposition. They are characterized by ultraviolet spectroscopic ellipsometry, transmission electron microscopy and X-ray photoelectron spectroscopy (XPS). The samples are shown to be crystalline up to x = 0.053. Ellipsometry is employed to obtain the ordinary complex DF, where the absorption onset shows a strong red shift with increasing Ti content, as well as an increase in amplitude which is associated with a successive take over of Ti related 3d-states in the density-of-states. Valence band XPS results lead to the conclusion that the strong red shift in the absorption onset with increasing Ti content is mainly due to conduction band lowering and less from the valence band.

ORCID iDs

Kluth, Elias, Fay, Michael, Parmenter, Christopher, Roberts, Joseph, Smith, Emily, Stoppiello, Craig, Massabuau, Fabien ORCID logoORCID: https://orcid.org/0000-0003-1008-1652, Goldhahn, Rüdiger and Feneberg, Martin;
  • Item type:Article
    ID code:84306
    Dates:
    Date
    Event
    27 February 2023
    Published
    10 February 2023
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:20 Feb 2023 16:13
    Last modified:17 Dec 2024 01:28
    URI:https://strathprints.strath.ac.uk/id/eprint/84306
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