Carrier and Phonon Dynamics in Multilayer WSe2 Captured by Extreme Ultraviolet Transient Absorption Spectroscopy
- Authors
- Oh, Juwon; Chang, Hung-Tzu; Chen, Christopher T.; Aloni, Shaul; Schwartzberg, Adam; Leone, Stephen R.
- Issue Date
- Mar-2023
- Publisher
- American Chemical Society
- Citation
- The Journal of Physical Chemistry C, v.127, no.10, pp 5004 - 5012
- Pages
- 9
- Journal Title
- The Journal of Physical Chemistry C
- Volume
- 127
- Number
- 10
- Start Page
- 5004
- End Page
- 5012
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/22379
- DOI
- 10.1021/acs.jpcc.2c07695
- ISSN
- 1932-7447
1932-7455
- Abstract
- Carrier and phonon dynamics in a multilayer WSe2 film are captured by extreme ultraviolet (XUV) transient absorption (TA) spectroscopy at the W N6,7, W O2,3, and Se M4,5 edges (30-60 eV). After the broadband optical pump pulse, the XUV probe directly reports on occupations of optically excited holes and phonon-induced band renormalizations. When compared with density functional theory calculations, XUV transient absorption due to holes is identified below the W O3 edge whereas signals at the Se M4,5 edges are dominated by phonon dynamics. Therein, 0.4 ps hole relaxation time, 1.5 ps carrier recombination time, and 1.7 ps phonon heating time are extracted. The acquisition of hole and phonon-induced signals in a single experiment can facilitate the investigation of the correlations between electron and phonon dynamics. Furthermore, the simultaneous observation of signals from different elements can be further extended to explore photochemical processes in multilayers and alloys, thereby providing key information for their applications in electronics, photocatalysts, and spintronics.
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Collections - College of Natural Sciences > Department of Chemistry > 1. Journal Articles
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