Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D32: Catalytic Materials and Processes
3:00 PM–5:48 PM,
Monday, March 6, 2023
Room: Room 224
Sponsoring
Unit:
DCMP
Chair: Sylvie Rangan, Rutgers University
Abstract: D32.00001 : Revealing Charge Dynamics of Cu2O Thin Film via Transient Absorption Spectroscopy and Numerical Modeling in Picosecond to Microsecond Time Scale*
3:00 PM–3:12 PM
Presenter:
Mona Asadinamin
(University of Georgia)
Author:
Mona Asadinamin
(University of Georgia)
Collaborations:
Henning Meyer, Susanne Ullrich, and Yiping Zhao
For TAS measurements, different excitation energies, are utilized at above, near, and below the band gap: 3.5 eV, 2.5 eV, 2.2 eV, and 1.9 eV. Four time constants are resolved, 0.5 picoseconds, 40 picoseconds, 10 nanoseconds and 2 microseconds, which confirms the necessity of exploring the charge dynamics on a broad time scale. The slowest time constant, [endif]--> is most likely due to the decay of conduction band electrons to the low-lying energy states whereas [endif]--> could come from the recombination of electrons and holes in the donor and acceptor energy states, respectively. The defect states are probably responsible for the slow relaxation of electrons (10 nanoseconds and 2 microseconds) to the valence band. Based on the previous theoretical and experimental results, a compelling energy diagram with a rate equation-based numerical model has been proposed to successfully explain both the spectroscopy- and time-dependent behaviors observed. This understanding can help us to better design Cu2O-based photocatalysts.
*NSF CHE-1800050LDRD (Savannah river national lab)
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700