Tip-enhanced photoluminescence of monolayer MoS<sub>2</sub> increased and spectrally shifted by injection of electrons-Reference-Cited by-同舟云学术

Tip-enhanced photoluminescence of monolayer MoS₂ increased and spectrally shifted by injection of electrons

Published:2023-04-06 Issue:14 Volume:12 Page:2937-2943
ISSN:2192-8606
Container-title:Nanophotonics
language:en
Short-container-title:

Author:

Wang Jizhou¹^ORCID,Han Zehua¹,He Zhe¹²,Wang Kai¹,Liu Xiaohui³,Sokolov Alexei V.¹⁴^ORCID

Affiliation:

1. Institute for Quantum Science and Engineering, Texas A&M University , College Station , TX 77843 , USA

2. Department of Medical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA

3. Department of Physics , University of Texas at Austin , Austin , TX 78712 , USA

4. Baylor Research Innovative Center , Baylor University , Waco , TX 76798 , USA

Abstract

Abstract Using tip-enhanced photoluminescence (TEPL), we investigate micron-size monolayer MoS2 flakes. In a sequence of studies, we apply various voltages between the Ag-coated nano-tip and the MoS2 flakes and observe an intriguing result. During the TEPL measurement, we observe that the photoluminescence spectrum is blue shifted and the overall signal intensity is increased. We attribute this behavior to plasmon-induced electron injection into MoS2. Additionally, when the tip is negatively biased with respect to the sample during the TEPL measurement, the nonuniform TEPL images of MoS2 monolayer flakes containing defects are gradually changed to be uniform that reach saturation. We verify that this saturation state in TEPL can last over half a year.

Funder

Herman F. Heep and Minnie Belle Heep Texas A&M University Endowed Fund

Welch Foundation

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

Link

https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0025/pdf

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