Journal Article

FZJ-2023-03397

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optical Properties of MoSe 2 Monolayer Implanted with Ultra-Low-Energy Cr Ions

Bui, M. N. (Corresponding author)FZJ* ; Rost, S.FZJ* ; Auge, M. ; Zhou, L.FZJ* ; Friedrich, C.FZJ* ; Blügel, S.FZJ* ; Kretschmer, S. ; Krasheninnikov, A. V. ; Watanabe, K. ; Taniguchi, T. ; Hofsäss, H. C. ; Grützmacher, D.FZJ* ; Kardynal, B. (Corresponding author)FZJ*

2023
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsami.3c05366  doi:10.34734/FZJ-2023-03397

Abstract: This paper explores the optical properties of an exfoliated MoSe2 monolayer implanted with Cr+ ions, accelerated to 25 eV. Photoluminescence of the implanted MoSe2 reveals an emission line from Cr-related defects that is present only under weak electron doping. Unlike band-to-band transition, the Cr-introduced emission is characterized by nonzero activation energy, long lifetimes, and weak response to the magnetic field. To rationalize the experimental results and get insights into the atomic structure of the defects, we modeled the Cr-ion irradiation process using ab initio molecular dynamics simulations followed by the electronic structure calculations of the system with defects. The experimental and theoretical results suggest that the recombination of electrons on the acceptors, which could be introduced by the Cr implantation-induced defects, with the valence band holes is the most likely origin of the low-energy emission. Our results demonstrate the potential of low-energy ion implantation as a tool to tailor the properties of two-dimensional (2D) materials by doping.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5224 - Quantum Networking (POF4-522) (POF4-522)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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