Temperature dependence of photoluminescence lifetime of atomically-thin WSe 2 layer

At cryogenic temperatures, the photoluminescence (PL) spectrum of monolayer WSe features a number of lines related to the recombination of so-called localized excitons (LEs). The intensity of these lines strongly decreases with increasing temperature. In order to understand the mechanism behind this...

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Bibliographic Details
Published in:Nanotechnology 2020-03, Vol.31 (13), p.135002
Main Authors: Łopion, A, Goryca, M, Smoleński, T, Oreszczuk, K, Nogajewski, K, Molas, M R, Potemski, M, Kossacki, P
Format: Article
Language:English
Subjects:
Physics
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Summary:At cryogenic temperatures, the photoluminescence (PL) spectrum of monolayer WSe features a number of lines related to the recombination of so-called localized excitons (LEs). The intensity of these lines strongly decreases with increasing temperature. In order to understand the mechanism behind this phenomenon we carried out a time-resolved experiment, which revealed a similar trend in the PL decay time. Our results identify the opening of additional non-radiative relaxation channels as a primary cause of the observed temperature quenching of the LEs' PL.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/ab60ca