Ultrafast charge transfer and carrier dynamics in a WS2/MoSe2 few-layer van der Waals heterostructure
Abstract
Photocarrier dynamics including interlayer charge transfer and intralayer valley scattering are studied in a heterostructure formed by trilayer WS2 and MoSe2. The sample is fabricated by mechanical exfoliation and dry transfer and characterized by atomic force microscopy, Raman spectroscopy, and photoluminescence measurements. The conduction band minima of the two materials are nearly degenerate, representing a unique band alignment. Layer-selective pump–probe measurements are performed with three configurations to reveal a complete picture of the photocarrier dynamics. By comparing the heterostructure with the two individual trilayer materials in each experimental configuration, ultrafast interlayer charge transfer is unambiguously observed, which occurs on the same time scale as the intralayer valley scattering of the photocarriers. The quasi-equilibrium distribution of electrons in the two layers mediate the fast carrier recombination process. Furthermore, these results show that the band structures of the few-layer transition metal dichalcogenides can enable rich photocarrier dynamics with intermediate band alignments that are complementary to the previously studied monolayer–monolayer heterostructures.
- Authors:
-
- Beijing Jiaotong Univ. (China)
- Beijing Univ. of Chemical Technology (China)
- Univ. of Kansas, Lawrence, KS (United States)
- Publication Date:
- Research Org.:
- Univ. of Kansas, Lawrence, KS (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
- OSTI Identifier:
- 1864722
- Alternate Identifier(s):
- OSTI ID: 1854058
- Grant/Contract Number:
- SC0020995
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry C
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 13; Journal ID: ISSN 2050-7526
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Bian, Ang, Fu, Shaohua, Wang, Pengzhi, Zhao, Kun, He, Jiaqi, Zhang, Xiaoxian, He, Dawei, Wang, Yongsheng, and Zhao, Hui. Ultrafast charge transfer and carrier dynamics in a WS2/MoSe2 few-layer van der Waals heterostructure. United States: N. p., 2022.
Web. doi:10.1039/d1tc05584d.
Bian, Ang, Fu, Shaohua, Wang, Pengzhi, Zhao, Kun, He, Jiaqi, Zhang, Xiaoxian, He, Dawei, Wang, Yongsheng, & Zhao, Hui. Ultrafast charge transfer and carrier dynamics in a WS2/MoSe2 few-layer van der Waals heterostructure. United States. https://doi.org/10.1039/d1tc05584d
Bian, Ang, Fu, Shaohua, Wang, Pengzhi, Zhao, Kun, He, Jiaqi, Zhang, Xiaoxian, He, Dawei, Wang, Yongsheng, and Zhao, Hui. Mon .
"Ultrafast charge transfer and carrier dynamics in a WS2/MoSe2 few-layer van der Waals heterostructure". United States. https://doi.org/10.1039/d1tc05584d. https://www.osti.gov/servlets/purl/1864722.
@article{osti_1864722,
title = {Ultrafast charge transfer and carrier dynamics in a WS2/MoSe2 few-layer van der Waals heterostructure},
author = {Bian, Ang and Fu, Shaohua and Wang, Pengzhi and Zhao, Kun and He, Jiaqi and Zhang, Xiaoxian and He, Dawei and Wang, Yongsheng and Zhao, Hui},
abstractNote = {Photocarrier dynamics including interlayer charge transfer and intralayer valley scattering are studied in a heterostructure formed by trilayer WS2 and MoSe2. The sample is fabricated by mechanical exfoliation and dry transfer and characterized by atomic force microscopy, Raman spectroscopy, and photoluminescence measurements. The conduction band minima of the two materials are nearly degenerate, representing a unique band alignment. Layer-selective pump–probe measurements are performed with three configurations to reveal a complete picture of the photocarrier dynamics. By comparing the heterostructure with the two individual trilayer materials in each experimental configuration, ultrafast interlayer charge transfer is unambiguously observed, which occurs on the same time scale as the intralayer valley scattering of the photocarriers. The quasi-equilibrium distribution of electrons in the two layers mediate the fast carrier recombination process. Furthermore, these results show that the band structures of the few-layer transition metal dichalcogenides can enable rich photocarrier dynamics with intermediate band alignments that are complementary to the previously studied monolayer–monolayer heterostructures.},
doi = {10.1039/d1tc05584d},
journal = {Journal of Materials Chemistry C},
number = 13,
volume = 10,
place = {United States},
year = {Mon Feb 28 00:00:00 EST 2022},
month = {Mon Feb 28 00:00:00 EST 2022}
}
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