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Anomalously polarised emission from a MoS(2)/WS(2) heterostructure
We report circularly polarised emission, with helicity opposite to the optical excitation, from a van der Waals heterostructure (HS) consisting of a monolayer MoS(2) and three-layer WS(2). Selective excitation of the MoS(2) layer confirms that this cross-polarized emission is due to the charge trans...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
RSC
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417150/ https://www.ncbi.nlm.nih.gov/pubmed/36133269 http://dx.doi.org/10.1039/d1na00462j |
Sumario: | We report circularly polarised emission, with helicity opposite to the optical excitation, from a van der Waals heterostructure (HS) consisting of a monolayer MoS(2) and three-layer WS(2). Selective excitation of the MoS(2) layer confirms that this cross-polarized emission is due to the charge transfer from the WS(2) layers to the MoS(2) layer. We propose that the high levels of n-doping in the constituent layers due to sulphur vacancies and defects give rise to an enhanced transition rate of electrons from the k valley of WS(2) to the k′ valley of MoS(2), which leads to the emission, counter polarized to the excitation. Simulations based on the rate equation model support this conclusion. |
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