Pressure-Dependent Light Emission of Charged and Neutral Excitons in Monolayer MoSe2

Fu, Xinpeng; Li, Fangfei; Lin, Jung-Fu; Gong, Yuanbo; Huang, Xiaoli; Huang, Yanping; Han, Bo; Zhou, Qiang; Cui, Tian

doi:10.1021/acs.jpclett.7b01374

Title: Pressure-Dependent Light Emission of Charged and Neutral Excitons in Monolayer MoSe₂

Journal Article · Mon Jul 17 00:00:00 EDT 2017 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.7b01374· OSTI ID:1372920

Fu, Xinpeng ^[1];

^[1]; Lin, Jung-Fu ^[2]; Gong, Yuanbo ^[1]; Huang, Xiaoli ^[1]; Huang, Yanping ^[1]; Han, Bo ^[1]; Zhou, Qiang ^[1];

^[1]

Jilin Univ., Changchun (China)
Univ. of Texas, Austin, TX (United States)

Tailoring the excitonic properties in two-dimensional monolayer transition metal dichalcogenides (TMDs) through strain engineering is an effective means to explore their potential applications in optoelectronics and nanoelectronics. Here we report pressure-tuned photon emission of trions and excitons in monolayer MoSe₂ via a diamond anvil cell (DAC) through photoluminescence measurements and theoretical calculations. Under quasi-hydrostatic compressive strain, our results show neutral (X⁰) and charged (X^–) exciton emission of monolayer MoSe₂ can be effectively tuned by alcohol mixture vs inert argon pressure transmitting media (PTM). During this process, X^– emission undergoes a continuous blue shift until reaching saturation, while X⁰ emission turns up splitting. Furthermore, the pressure-dependent charging effect observed in alcohol mixture PTM results in the increase of the X^– exciton component and facilitates the pressure-tuned emission of X^– excitons. This substantial tunability of X^– and X⁰ excitons in MoSe₂ can be extended to other 2D TMDs, which holds potential for developing strained and optical sensing devices.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC)

OSTI ID:: 1372920

Journal Information:: Journal of Physical Chemistry Letters, Vol. 8, Issue 15; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 28 works

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Title: Pressure-Dependent Light Emission of Charged and Neutral Excitons in Monolayer MoSe2

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Title: Pressure-Dependent Light Emission of Charged and Neutral Excitons in Monolayer MoSe₂