Charge carrier scattering and ultrafast Auger dynamics in two-dimensional superatomic semiconductors
Abstract
Superatom solids are promising for optoelectronic applications, owing to their tunable structural and electronic properties; yet, the electronic transport properties of these materials have been largely unexplored. Here, we report the Auger recombination dynamics of free carriers in two representative two-dimensional superatomic semiconductors, Re6Se8Cl2 and Mo6S3Br6, studied using ultrafast terahertz photoconductivity measurements. The fast Auger recombination dynamics are characterized by a cubic dependence of the Auger rate on carrier density in Re6Se8Cl2 and a quadratic dependence in Mo6S3Br6. The effective lifetimes of Mo6S3Br6 (∼ 0.5 ps) are over an order of magnitude shorter than those (∼ 20 ps) of Re6Se8Cl2. These results highlight the variability of the optoelectronic properties of different superatom solids.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 18, 2020
- Source ID
- 10.1063/5.0001839
Entities
People
- Avalon H Dismukes
- Bonnie Choi
- Heejae Kim
- Kihong Lee
- Mischa Bonn
- Xavier Roy
- Xiaoyang Zhu
Organizations
- Air Force Office of Scientific Research
- Columbia University
- Max Planck Institute for Polymer Research
- National Science Foundation