Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties


Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties



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.


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



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


Project Designation

Independent Research

Primary Advisor

Said Elhamri

Primary Advisor's Department



Stander Symposium, College of Arts and Sciences

Institutional Learning Goals

Scholarship; Practical Wisdom; Vocation

Nano-platelet Bi2-Bi2Se3 Nucleation and Optical Properties