Quantum Motion, Relaxation and Stability of Multiple Excitons and Charge Carriers in Semiconductor Nanoplatelets

Explore groundbreaking research on excitons and charge carriers in semiconductor nanoplatelets through this 72-minute seminar presentation by Professor Laurens D.A. Siebbeles from Delft University of Technology. Delve into the quantum mechanical behavior of CdSe nanoplatelets, examining how their thickness of few atomic layers and lateral dimensions affect their optical and electronic properties. Learn about the quantum-confinement effects on exciton center-of-mass motion, photoluminescence spectra, and absorption characteristics through particle-in-a-box model analysis. Discover insights into photogeneration quantum yields, biexciton and trion formation, and the unexpected stability of excitons at high densities. Understand the theoretical framework explaining why electron-hole plasma formation is prevented due to persistent non-zero Coulomb screening length, supported by time-resolved optical absorption and terahertz conductivity measurements.