Photoluminescence Saturation and Exciton Decay Dynamics in Transition Metal Dichalcogenide Monolayers

Min Ju Shin; Dong Hak Kim; D. Lim

doi:10.3938/jkps.65.2077

Photoluminescence Saturation and Exciton Decay Dynamics in Transition Metal Dichalcogenide Monolayers

Mesoscale and Nanoscale Physics 2015-06-22 v2 Materials Science

Authors: Min Ju Shin , Dong Hak Kim , D. Lim

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Abstract

We report a photoluminescence (PL) and transient reflection spectroscopy study of exciton dynamics in monolayer transition transition-metal dichalcogenides (TMDs). PL saturation in monolayer MoSe2 occurs an excitation intensity more than two orders of magnitude lower than in monolayer MoS2. Transient reflection shows that the nonlinear exciton-exciton annihilation is the dominant exciton decay process in monolayer MoSe2 in contrast to the previously reported linear exciton decay in monolayer MoS2. In addition, the exciton lifetime in MoSe2, > 125 ps, is more than an order of magnitude longer than the several-ps exciton lifetime in MoS2. We find that the dramatically different exciton decay mechanism and PL saturation behavior of MoSe2 and MoS2 monolayers can be explained by the difference in their exciton lifetime.

Keywords

photoluminescence saturation exciton decay dynamics transition metal dichalcogenides monolayer MoSe2 monolayer MoS2 exciton-exciton annihilation transient reflection spectroscopy

Cite

@article{arxiv.1409.4546,
  title  = {Photoluminescence Saturation and Exciton Decay Dynamics in Transition Metal Dichalcogenide Monolayers},
  author = {Min Ju Shin and Dong Hak Kim and D. Lim},
  journal= {arXiv preprint arXiv:1409.4546},
  year   = {2015}
}

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Photoluminescence Saturation and Exciton Decay Dynamics in Transition Metal Dichalcogenide Monolayers

Abstract

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