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Trion formation in monolayer MoS2 observed via femtosecond time-resolved photoluminescence measurements

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We carried out femtosecond time-resolved photoluminescence measurements on monolayer MoS2 on a sapphire substrate. The charge density of the monolayer MoS2 was evaluated by spectroscopic analysis. Time evolutions of exciton and trion luminescence in the femto- and picosecond region were obtained. The rate-equation analysis provided the time constant of exciton relaxation to trion, i.e., trion formation. This time constant was compared with those of other two-dimensional electron systems and is discussed in terms of two dimensionality defined by thickness. This study advances the understanding of exciton physics in low-dimensional systems.

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  • 11/12/2024
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  • Accepted manuscript
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  • Funder identifier
    JP26107520
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    Japan Society for the Promotion of Science
    Funder identifier
    JP24K06917
    Funder name
    Japan Society for the Promotion of Science
    Funder identifier
    JP16H00908
    Funder name
    Japan Society for the Promotion of Science

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