Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties

Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties

    Presenter(s)

    Margaret M. Brown; other authors: Katherine M. Burzynski, Derek Winner, Krishnamurthy Mahalingam, Ryan P. Laing, Tobin C. Muratore, Jeff L. Brown, Kurt G. Eyink, Said Elhamri, J.P. Corbett, and Amber Reed.

    Comments

    Presentation: 10:45 a.m.-12:00 p.m., Kennedy Union Ballroom

    Description

    Topological insulators are an exciting classification of materials exhibiting protected surface states that allow for spin-orbit coupling on the conductive surface while maintaining an insulated bulk. A selenium-deficient growth of the well-known topological insulator, Bi2Se3,produces a natural heterostructure consisting of quintuple layers of Bi2Se3 and 2D layers of Bi2 . Previous work has shown that both terminating layers yield distinct topologically protected surface states. Growth studies of this material reveal dimension-dependent optical properties. Evidence of an increased optical bandgap with decreased nano-platelet volume suggests the presence of quantum confinement, a phenomena that results in an increased and quantized bandgap. Additionally, this investigation reports a pressure-dependent nucleation study of Bi2-Bi2Se3 grown via direct current magnetron sputtering. This nucleation study and results can be exploited to fine tune the optical bandgap of Bi2-Bi2Se3 nano-platelets over a range of 1.55 to 2.21 eV. Such tunability may be utilized for the development of prototypical optoelectronic devices.

    Publication Date

    4-19-2023

    Project Designation

    Independent Research

    Primary Advisor

    Said Elhamri

    Primary Advisor's Department

    Physics

    Keywords

    Stander Symposium, College of Arts and Sciences

    Institutional Learning Goals

    Scholarship; Practical Wisdom; Vocation

    Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties

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