Temperature-dependent photoluminescence emission and Raman scattering from Mo1-x W x S2 monolayers.

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Abstract

2D transition metal dichalcogenide (TMD) alloys with tunable band gaps have recently gained wide interest due to their potential applications in future nanoelectronics and optoelectronics. Here, we report the temperature-dependent photoluminescence (PL) and Raman spectra of Mo1-x W x S2 monolayers with W composition x = 0, 0.29, 0.53, 0.66 and 1 in the temperature range 93-493 K. We observed a linear temperature dependence of PL emission energy and Raman frequency. The PL intensity is enhanced at high temperature (>393 K). The temperature coefficients are negative for both PL and Raman bands, which may result from anharmonicity, thermal expansion and composition disorder.

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Journal

Journal ID (iso-abbrev): Nanotechnology

Title: Nanotechnology

Publisher: IOP Publishing

ISSN (Electronic): 1361-6528

ISSN (Print): 0957-4484

Publication date (Electronic): Nov 04 2016

Volume: 27

Issue: 44

Affiliations

[1 ] CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.

Article

DOI: 10.1088/0957-4484/27/44/445705

PubMed ID: 27670929

SO-VID: 2fe2ae45-bdca-4850-8cfb-130e5430bec2

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