Energetic hot electrons from magnetically doped semiconductor nanostructures and their application in photocatalysis
■ Date: 2017. 07. 07(FRI) 10:30 ~ 12:00
■ Place: Science BuildingⅠ, Room.202 Multimedia Room
■ Speaker: Prof. Dong Hee Son(Dept. Chemistry, Texas A&M Univ.)
■ Host of a Seminar: Prof. Unyong Jeong
This presentation will discuss several photophysical properties of Mn-doped semiconductor nanostructure focusing on the energy and charge transfer processes and generation of highly energetic non-plasmonic hot electrons. The materials of interest are Mn-doped II-VI semiconductor quantum dots and Mn-doped cesium lead halide (CsPbX3) perovskite nanocrystals. Because of the efficient exchange coupling between exciton and d electrons of the dopant ions, Mn-doped semiconductor quantum dots exhibit several unique optical and magnetic properties including sensitized dopant luminescence and generation of highly energetic hot electrons via sequential exciton-to-hot carrier upconversion process. This presentation will discuss the structural correlation of the exciton-to-Mn energy transfer dynamics and hot electron generation efficiency. The application of highly energetic hot electrons, capable of photoemission even above the vacuum level under weak cw bandgap excitation, will be discussed using photocatalytic H2 production as the test platform. Part of the presentation will also cover the recent progress made in our laboratory on the synthesis of Mn-doped and undoped CsPbX3 nanocrystals of varying structural anisotropy and the study of the energy and charge transfer process.
Dept. of MSE / BK21+