Nanoscale Modification of WS2 Trion Emission by Its Local Electromagnetic Environment

Noémie Bonnet; Hae Yeon Lee; Fuhui Shao; Steffi Y. Woo; Jean Denis Blazit; Kenji Watanabe; Takashi Taniguchi; Alberto Zobelli; Odile Stéphan; Mathieu Kociak; Silvija Gradečak; Luiz H.G. Tizei

doi:10.1021/acs.nanolett.1c02600

Nanoscale Modification of WS₂ Trion Emission by Its Local Electromagnetic Environment

Noémie Bonnet, Hae Yeon Lee, Fuhui Shao, Steffi Y. Woo, Jean Denis Blazit, Kenji Watanabe, Takashi Taniguchi, Alberto Zobelli, Odile Stéphan, Mathieu Kociak, Silvija Gradečak, Luiz H.G. Tizei

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties. A key missing element for complete control is a direct spatial correlation of optical response to nanoscale modifications due to the large gap in spatial resolution between optical spectroscopy and nanometer-resolved techniques. Here, we bridge this gap by obtaining nanometer-resolved optical properties using electron spectroscopy at cryogenic temperatures, specifically electron energy loss spectroscopy for absorption and cathodoluminescence for emission, which are then directly correlated to chemical and structural information. In an h-BN/WS₂/h-BN heterostructure, we observe local modulation of the trion (X^–) emission due to tens of nanometer wide dielectric patches. Trion emission also increases in regions where charge accumulation occurs, close to the carbon film supporting the heterostructures. The localized exciton emission (L) detected here is not correlated to strain above 1%, suggesting point defects might be involved in their formation.

Original language	English
Pages (from-to)	10178-10185
Number of pages	8
Journal	Nano Letters
Volume	21
Issue number	24
DOIs	https://doi.org/10.1021/acs.nanolett.1c02600
State	Published - Dec 22 2021

Funding

This project has been funded in part by the National Agency for Research under the program of future investment TEMPOS-CHROMATEM (reference no. ANR-10-EQPX-50) and the JCJC grant SpinE (reference no. ANR-20-CE42-0020) and by the European Union\u2019s Horizon 2020 research and innovation programme under Grant Agreements 823717 (ESTEEM3) and 101017720 (EBEAM). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant JPMXP0112101001, JSPS KAKENHI Grant JP20H00354 and the CREST(JPMJCR15F3), JST. This work has been supported by Region I\u0302le-de-France in the framework of DIM SIRTEQ. We thank Ashish Arora and coauthors for kindly providing the optical absorption data on a WS monolayer encapsulated in h-BN. Luiz F. Zagonel is acknowledged for ideas and discussion on data analysis. shown in this document. 2

Keywords

EELS
Transition metal dichalcogenides monolayers
cathodoluminescence
excitons
trions
van der Waals heterostructures

Access to Document

10.1021/acs.nanolett.1c02600

Cite this

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title = "Nanoscale Modification of WS2 Trion Emission by Its Local Electromagnetic Environment",

abstract = "Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties. A key missing element for complete control is a direct spatial correlation of optical response to nanoscale modifications due to the large gap in spatial resolution between optical spectroscopy and nanometer-resolved techniques. Here, we bridge this gap by obtaining nanometer-resolved optical properties using electron spectroscopy at cryogenic temperatures, specifically electron energy loss spectroscopy for absorption and cathodoluminescence for emission, which are then directly correlated to chemical and structural information. In an h-BN/WS2/h-BN heterostructure, we observe local modulation of the trion (X–) emission due to tens of nanometer wide dielectric patches. Trion emission also increases in regions where charge accumulation occurs, close to the carbon film supporting the heterostructures. The localized exciton emission (L) detected here is not correlated to strain above 1%, suggesting point defects might be involved in their formation.",

keywords = "EELS, Transition metal dichalcogenides monolayers, cathodoluminescence, excitons, trions, van der Waals heterostructures",

author = "No{\'e}mie Bonnet and Lee, {Hae Yeon} and Fuhui Shao and Woo, {Steffi Y.} and Blazit, {Jean Denis} and Kenji Watanabe and Takashi Taniguchi and Alberto Zobelli and Odile St{\'e}phan and Mathieu Kociak and Silvija Grade{\v c}ak and Tizei, {Luiz H.G.}",

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doi = "10.1021/acs.nanolett.1c02600",

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AU - Bonnet, Noémie

AU - Lee, Hae Yeon

AU - Shao, Fuhui

AU - Woo, Steffi Y.

AU - Blazit, Jean Denis

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Zobelli, Alberto

AU - Stéphan, Odile

AU - Kociak, Mathieu

AU - Gradečak, Silvija

AU - Tizei, Luiz H.G.

PY - 2021/12/22

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N2 - Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties. A key missing element for complete control is a direct spatial correlation of optical response to nanoscale modifications due to the large gap in spatial resolution between optical spectroscopy and nanometer-resolved techniques. Here, we bridge this gap by obtaining nanometer-resolved optical properties using electron spectroscopy at cryogenic temperatures, specifically electron energy loss spectroscopy for absorption and cathodoluminescence for emission, which are then directly correlated to chemical and structural information. In an h-BN/WS2/h-BN heterostructure, we observe local modulation of the trion (X–) emission due to tens of nanometer wide dielectric patches. Trion emission also increases in regions where charge accumulation occurs, close to the carbon film supporting the heterostructures. The localized exciton emission (L) detected here is not correlated to strain above 1%, suggesting point defects might be involved in their formation.

AB - Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties. A key missing element for complete control is a direct spatial correlation of optical response to nanoscale modifications due to the large gap in spatial resolution between optical spectroscopy and nanometer-resolved techniques. Here, we bridge this gap by obtaining nanometer-resolved optical properties using electron spectroscopy at cryogenic temperatures, specifically electron energy loss spectroscopy for absorption and cathodoluminescence for emission, which are then directly correlated to chemical and structural information. In an h-BN/WS2/h-BN heterostructure, we observe local modulation of the trion (X–) emission due to tens of nanometer wide dielectric patches. Trion emission also increases in regions where charge accumulation occurs, close to the carbon film supporting the heterostructures. The localized exciton emission (L) detected here is not correlated to strain above 1%, suggesting point defects might be involved in their formation.

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