Ultrafast Optical Microscopy of Single Monolayer Molybdenum Disulfide Flakes

Minah Seo, Hisato Yamaguchi, Aditya D. Mohite, Stephane Boubanga-Tombet, Jean Christophe Blancon, Sina Najmaei, Pulickel M. Ajayan, Jun Lou, Antoinette J. Taylor, Rohit P. Prasankumar

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We have performed ultrafast optical microscopy on single flakes of atomically thin CVD-grown molybdenum disulfide, using non-degenerate femtosecond pump-probe spectroscopy to excite and probe carriers above and below the indirect and direct band gaps. These measurements reveal the influence of layer thickness on carrier dynamics when probing near the band gap. Furthermore, fluence-dependent measurements indicate that carrier relaxation is primarily influenced by surface-related defect and trap states after above-bandgap photoexcitation. The ability to probe femtosecond carrier dynamics in individual flakes can thus give much insight into light-matter interactions in these two-dimensional nanosystems.

Original languageEnglish
Article number21601
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Feb 15

ASJC Scopus subject areas

  • General

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