Issue 9, 2014

Exciton diffusion in monolayer and bulk MoSe2

Abstract

The exciton dynamics in monolayer and bulk MoSe2 samples are studied by transient absorption microscopy with a high spatiotemporal resolution. Excitons are injected with a point-like spatial distribution using a tightly focused femtosecond pulse. The spatiotemporal dynamics of these excitons are monitored by measuring transient absorption of a time-delayed and spatially scanned probe pulse. We obtain the exciton diffusion coefficients of 12 ± 3 and 19 ± 2 cm2 s−1 and exciton lifetimes of 130 ± 20 and 210 ± 10 ps in the monolayer and bulk samples, respectively. These values are useful for understanding excitons and their interactions with the environment in these structures and potential applications of MoSe2 in optoelectronics and electronics.

Graphical abstract: Exciton diffusion in monolayer and bulk MoSe2

Supplementary files

Article information

Article type
Paper
Submitted
03 Jan 2014
Accepted
20 Feb 2014
First published
25 Feb 2014

Nanoscale, 2014,6, 4915-4919

Author version available

Exciton diffusion in monolayer and bulk MoSe2

N. Kumar, Q. Cui, F. Ceballos, D. He, Y. Wang and H. Zhao, Nanoscale, 2014, 6, 4915 DOI: 10.1039/C3NR06863C

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