Femtosecond photoluminescence from monolayer MoS2 : Time-domain study on exciton diffusion
Autor: | Takeshi Koyama, Ryo Kitaura, Mitsuhiro Okada, Hideo Kishida, Kensuke Saito |
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Rok vydání: | 2021 |
Předmět: |
Condensed Matter::Quantum Gases
Photoluminescence Materials science Condensed Matter::Other Exciton Center (category theory) 02 engineering and technology Trapping Chemical vapor deposition Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Condensed Matter::Materials Science 0103 physical sciences Monolayer Femtosecond Diffusion (business) 010306 general physics 0210 nano-technology |
Zdroj: | Physical Review B. 103 |
ISSN: | 2469-9969 2469-9950 |
Popis: | Transition metal dichalcogenides are expected to be used in transparent, flexible, and highly efficient light-emitting devices. Exciton diffusion is a key factor in device applications. In this study, we measured the photoluminescence (PL) decay of excitons in a ${\mathrm{MoS}}_{2}$ monolayer synthesized by chemical vapor deposition on a sapphire substrate. The PL decay of A and B excitons in the femtosecond regime was observed. The PL decay curves were analyzed based on a model of exciton trapping at the deactivation center via diffusion, and the diffusion time until trapping was obtained. The diffusion coefficient and the corresponding exciton mobility were also determined. This study demonstrates the two-dimensional exciton diffusion in the femtosecond regime in the ${\mathrm{MoS}}_{2}$ monolayer. |
Databáze: | OpenAIRE |
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