Temperature dependence of photoluminescence lifetime of atomically-thin WSe2 layer
Abstract
At cryogenic temperatures, the photoluminescence (PL) spectrum of monolayer WSe2 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.
- Publication:
-
Nanotechnology
- Pub Date:
- March 2020
- DOI:
- 10.1088/1361-6528/ab60ca
- Bibcode:
- 2020Nanot..31m5002L
- Keywords:
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- 2D materials;
- dichalcogenides;
- photoluminescence;
- time-resolved photoluminescence;
- monolayer films