Recombination dynamics of optically excited charge carriers in bulk MoS2

Transition metal dichalcogenides (TMDCs), such as MoS2, are promising candidates for optoelectronic or catalytic applications. On that account, a detailed characterization of the electronic dynamics in these materials is of pivotal importance. Here, we investigate the temporal evolution of an excite...

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Bibliographic Details
Published inJournal of physics. B, Atomic, molecular, and optical physics Vol. 50; no. 19
Main Authors Völzer, Tim, Lütgens, Matthias, Fennel, Franziska, Lochbrunner, Stefan
Format Journal Article
LanguageEnglish
Published IOP Publishing 22.09.2017
Subjects
charge carrier dynamics
molybdenum disulfide
pump-probe spectroscopy
transition metal dichalcogenides
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Summary:Transition metal dichalcogenides (TMDCs), such as MoS2, are promising candidates for optoelectronic or catalytic applications. On that account, a detailed characterization of the electronic dynamics in these materials is of pivotal importance. Here, we investigate the temporal evolution of an excited carrier population by all-optical pump-probe spectroscopy. On the sub-picosecond time scale we observe thermal relaxation of the excited carriers by electron-phonon coupling. The dynamics on the nanosecond time scale can be understood in terms of defect-assisted Auger recombination over a broad carrier density regime spanning more than one order of magnitude. Hence, our results emphasize the importance of defect states for electronic processes in TMDCs at room temperature.
Bibliography:JPHYSB-103636.R1
ISSN:0953-4075
1361-6455
DOI:10.1088/1361-6455/aa89df