Emergent Phenomena in Old Materials
Department of Chemistry
University of Massachusetts Amherst
Tuesday, January 14, 2019
C2-361 (Reading Room)
The electronic structure and functionality of semiconductors is very sensitive to the presence of defects in the lattice. Aliovalent transition metal dopants in bulk oxide semiconductors are well-known multifunctional materials with potential application in visible light photocatalysis, spintronics and optoelectronics. However, these types of materials have received little attention as nanocrystalline materials. In this talk, I will present our recent work on the synthesis and characterization of transition-metal dopants in colloidal metal oxide nanocrystals. We have discovered unique electronic structures that can be easily exploited in this class of aliovalent diluted magnetic semiconductors. I will also demonstrate the tunability and reversibility of this post-synthetic modification of the nanocrystals to study emergent interactions between dopants and free carriers in these materials. In conclusion, I will compare these aliovalent DMSs to the more common isovalent DMSs.
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