A5003454791- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Optical properties and cooling technologies in crystalline materials
- Perovskite Materials and Applications
- Surface and Thin Film Phenomena
- Nanocluster Synthesis and Applications
- Advanced Semiconductor Detectors and Materials
- Semiconductor materials and interfaces
University of Colorado Boulder
2023-2025
University of Colorado System
2025
The capture of photoexcited hot electrons in semiconductors before they lose their excess energy to cooling is a long-standing goal photon conversion. Semiconductor nanocrystals have large electron spacings that are expected slow down relaxation by phonon emission, but nanocrystals, nevertheless, cool rapidly transfer holes. This makes the intrinsic phonon-bottleneck-limited lifetime elusive. We used combination theory and experiments probe hot-electron dynamics negatively charged cadmium...
Transient absorption (TA) spectroscopy of semiconductor nanocrystals (NCs) is often used for excited state population analysis, but recent results suggest that TA bleach signals associated with multiexcitons in NCs do not scale linearly exciton multiplicity. In this manuscript, we probe the factors determine intensities and spectral positions biexciton components spectra CdSe quantum dots (QDs) five diameters. We find that, all cases, peak intensity spectrum less than 1.5 times single...
The capture of photoexcited hot electrons in semiconductors before they lose their excess energy to cooling is a long-standing goal photon conversion. Semiconductor nanocrystals have large electron spacings that are expected slow down relaxation by phonon emission, but nevertheless cool rapidly transfer holes. This makes the intrinsic phonon-bottleneck limited lifetime elusive. We used combination theory and experiments probe dynamics negatively charged Cadmium Sulfide (CdS) colloidal...
The utilization of excited charge carriers in semiconductor nanocrystals (NCs) for optoelectronic technologies has been a long-standing goal the field nanoscience. Experimental efforts to extend lifetime have therefore principal focus. To understand limits these lifetimes, this work, we theoretically study time scales pure electron relaxation negatively charged NCs composed two prototypical materials: CdSe and CdS. We find that hot electrons lifetimes are 5 6 orders magnitude longer than CdS...
The utilization of excited charge carriers in semiconductor nanocrystals (NCs) for optoelectronic technologies has been a long-standing goal the field nanoscience. Experimental efforts to extend lifetime have therefore principal focus. To understand limits these lifetimes, this work, we theoretically study timescales pure electron relaxation negatively charged NCs composed two prototypical materials: CdSe and CdS. We find that hot electrons lifetimes are five six orders magnitude longer than...