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Public Seminar of PhD Candidate:
Optical Studies of Luminescence Mechanisms and Processes in Semiconductor Functional Nanostructures and Novel Materials


Speaker:Mr. Zhicheng SU
Affiliation:The University of Hong Kong
Date:November 15, 2017 (Wednesday)
Time:2:30 p.m.
Venue:Rm 518, 5/F, Chong Yuet Ming Physics Building, HKU

Abstract
 

Novel semiconducting materials and functional nanostructures have been extensively explored due to their promising wide applications ranging from solar cells in spacecraft to LED display in cellphone. However, our current understanding on some physical mechanisms in these new materials and nanostructures is far from enough to support their rapid development.

In this study, we present comprehensive optical spectroscopic investigations of luminescence mechanisms and internal processes of carriers in several semiconductor functional nanostructures and novel materials, including GaInP based solar cell, coupled InGaN QW-QDs nanostructures, organic luminescent copper complexes and carbon nanodots. Meanwhile, theoretical analysis and modelling are also done to gain a deeper insight into the phenomena and underlying mechanisms. A generalized theoretical model has been developed to quantitatively describe the dispersive thermodynamics of localized carriers and their transient luminescence behaviors at different temperatures. In addition, phonon-assisted tunneling, phonon-electron coupling and thermally activated delayed fluorescence are also quantitatively analyzed.

Anyone interested is welcome to attend.