Journal
ACS NANO
Volume 9, Issue 6, Pages 6459-6464Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02144
Keywords
transition metal dichalcogenides; van der Waals heterostructure; exciton; trion; charge transfer; photoluminescence
Categories
Funding
- National Science Foundation of USA [DMR-0954486, IIA-1430493]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0954486] Funding Source: National Science Foundation
- Office of Integrative Activities [1430519] Funding Source: National Science Foundation
- Office Of The Director [1430519] Funding Source: National Science Foundation
- Office Of The Director
- Office of Integrative Activities [1430493] Funding Source: National Science Foundation
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We report the observation of trions at room temperature in a van der Waals heterostructure composed of MoSe2 and WS2 nnonolayers. These trions are formed by excitons excited in the WS2 layer and electrons transferred from the MoSe2 layer. Recombination of trions results in a peak in the photoluminescence spectra, which is absent in monolayer WS2 that is not in contact with MoSe2. The trion origin of this peak is further confirmed by the linear dependence of the peak position on excitation intensity. We deduced a zero-density trion binding energy of 62 meV. The trion formation facilitates electrical control of exciton transport in transition metal dichalcogenide heterostructures, which can be utilized in various optoelectronic applications.
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