Invited Speaker

Enhanced Emission From the Bright Exciton and Locating the Dark Exciton in Strained CdSe/CdxZn1–xSe Quantum Dots

Igor Fedin (The University of Alabama)

Biography:Dr. Fedin is an expert in the synthesis and characterization of colloidal semiconductor nanocrystals of different topologies, morphologies, and compositions. He earned his M.S. in Physics from The University of Akron in 2011. He earned his Ph.D. at the University of Chicago under the supervision of Prof. Dmitri Talapin. As part of his Ph.D. research, Fedin developed novel chemical procedures for preparing advanced semiconductor nanostructures including colloidal quantum wells, quantum rings, and multi-shell QDs. He developed an electrochemical tool to quantify layer adsorption and shell growth on colloidal QDs in non-polar solvents at elevated temperatures. Dr. Fedin’s colloidal quantum wells showed a record-low threshold of amplified spontaneous emission in a collaborative project with Dr. Richard Schaller of Argonne National Lab. Dr. Fedin did his postdoctoral research focusing on the chemistry and spectroscopy of QDs at Los Alamos National Lab under supervision of Dr. Victor Klimov. Fedin synthesized strained compositionally graded QDs of II–VI materials with strongly suppressed Auger recombination. In collaboration with Dr. Scott Crooker, he measured the exciton fine structure of these QDs, located the dark exciton, and showed that 40% of all light is emitted directly from the bright exciton in these QDs at cryogenic temperatures. Dr. Fedin started as an assistant professor at The University of Alabama in August 2020. He has established a research program in the synthesis and spectroscopy of fast-emitting near-IR QDs. Dr. Fedin is a co-author of 24 publications with over 1900 citations and has an h-index of 19.