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Localized state effect and exciton dynamics for monolayer WS2
Optics Express
|March 17, 2021
Summary
Aging monolayer tungsten disulfide (WS2) creates localized states that significantly alter exciton dynamics. This study reveals how these changes impact WS2 optoelectronic properties, offering insights into material modulation.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional transition metal dichalcogenides (TMDCs) are key for next-generation optoelectronics.
- Understanding exciton dynamics is crucial for TMDC device performance.
Purpose of the Study:
- Investigate the impact of ambient aging on monolayer tungsten disulfide (WS2).
- Analyze the formation and effects of localized states on exciton dynamics in aged WS2.
Main Methods:
- Exposure of monolayer WS2 to ambient conditions for six months.
- Photoluminescence (PL) and time-resolved photoluminescence (TRPL) spectroscopy.
Main Results:
- Formation of localized states in monolayer WS2 after aging.
- Localized states significantly influence exciton energy filling, thermal activation, redistribution, and decay.
- Observed changes in exciton dynamics correlate with altered optical properties.
Conclusions:
- Aging induces localized states in monolayer WS2, impacting exciton dynamics.
- These findings enhance understanding of aged TMDCs and their optical properties.
- The aging process presents a potential method for modulating TMDC optical properties.
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