Sumin Choi

PhD Candidate
Microstructural Analysis Unit
University of Technology, Sydney



Sumin is a PhD student studying zinc oxide (ZnO) which is a semiconductor material and might be a good candidate for short wavelength optoelectronic devices such as laser diodes. He has recently completed his Bachelor degree with First Class Honours and University Medal in 2012.

His research mainly involves cathodoluminescence spectroscopy which is a key technique to examine the electronic band structures of semiconductor materials since the optical properties of a semiconductor primarily reflect the electronic structure. He has applied this technique to analyse whispering gallery modes and defect distributions of ZnO by cahodoluminescence mapping. He is primarily being supervised by Dr. Cuong Ton-That, Prof. Matthew Phillips and Dr. Igor Aharonovich.


Recent Projects

Optical and lasing properties of ZnO nano- and microstructures.

Effects of non-stoichiometry on the structural and optical properties of ZnO



Dr. Cuong Ton-That

Prof. Matthew Phillips

Dr. Igor Aharonovich


Recent Interests and Techniques

Spatial distribution of defects in ZnO microdisks

Whispering Gallery Modes of ZnO microdisks

Cathodoluminescence and Photoluminescence spectroscopy


Recent Awards and Scholarships

International Research Scholarship (IRS)

University Medal (2012)

Dean’s Merit List for academic excellence award (UTS – 2009, 2010, 2012)

Stanton Coalstad Prize (UTS – 2009, The highest mark in ‘Introduction in Materials’ subject)




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