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Nonblinking, Intense Two-Dimensional Light Emitter: Monolayer WS2 Triangles
Abstract
Monolayer WS2 (1L-WS2), with a direct band gap, provides an ideal platform to investigate unique properties of two-dimensional semiconductors. In this work, light emission of a 1L-WS2 triangle has been studied by using steady-state, time-resolved, and temperature-dependent photoluminescence (PL) spectroscopy. Two groups of 1L-WS2 triangles have been grown by chemical vapor deposition, which exhibit nonuniform and uniform PL, respectively. Observed nonuniform PL features, i.e., quenching and blue-shift in certain areas, are caused by structural imperfection and n-doping induced by charged defects. Uniform PL is found to be intrinsic, intense, and nonblinking, which are attributed to high crystalline quality. The binding energy of the A-exciton is extracted experimentally, which gives direct evidence for the large excitonic effect in 1L-WS2. These superior photon emission features make 1L-WS2 an appealing material for optoelectronic applications such as novel light-emitting and biosensing devices.
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Self-citation
Metadata
- Authors
- Peimyoo, N., Shang, J., Cong, C., Shen, X., Wu, X., Yeow, E. K. L., & Yu, T.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-11-27
- Volume
- 7
- Issue
- 12
- Pages
- 10985-10994
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2323186015
- Cited by
- 308
- References
- 61
- FWCI
- 12.58
- Type
- journal article
- Language
- en
- Open access
- closed
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