Strained bubbles in van der Waals heterostructures as local emitters of photoluminescence with adjustable wavelengthCitation formats

  • External authors:
  • Anastasia Tyurnina
  • Denis Bandurin
  • Ekaterina Khestanova
  • Vasyl G. Kravets
  • Maciej Koperski
  • Francisco Guinea
  • Andre K. Geim

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Strained bubbles in van der Waals heterostructures as local emitters of photoluminescence with adjustable wavelength. / Tyurnina, Anastasia; Bandurin, Denis; Khestanova, Ekaterina; Kravets, Vasyl G.; Koperski, Maciej; Guinea, Francisco; Grigorenko, Alexander N.; Geim, Andre K.; Grigorieva, Irina V.

In: ACS Photonics, 2019.

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Tyurnina, Anastasia ; Bandurin, Denis ; Khestanova, Ekaterina ; Kravets, Vasyl G. ; Koperski, Maciej ; Guinea, Francisco ; Grigorenko, Alexander N. ; Geim, Andre K. ; Grigorieva, Irina V. / Strained bubbles in van der Waals heterostructures as local emitters of photoluminescence with adjustable wavelength. In: ACS Photonics. 2019.

Bibtex

@article{1b3c4ee075c247799b5b87a684a82548,
title = "Strained bubbles in van der Waals heterostructures as local emitters of photoluminescence with adjustable wavelength",
abstract = "The possibility to tailor photoluminescence (PL) of monolayer transition metal dichalcogenides (TMDCs) using external factors such as strain, doping and external environment is of significant interest for optoelectronic applications. Strain in particular can be exploited as a means to continuously vary the bandgap. Micrometer-scale strain gradients were proposed for creating ‘artificial atoms’ that can utilize the so-called exciton funneling effect and work, for example, as exciton condensers. Here we describe room-temperature PL emitters that naturally occur whenever monolayer TMDC is deposited on an atomically flat substrate. These are hydrocarbon-filled bubbles which provide predictable, localized PL from well-separated submicron areas. Their emission energy is determined by the built-in strain controlled only by the substrate material, such that both the maximum strain and the strain profile are universal for all bubbles on a given substrate, i.e., independent of the bubble size. We show that for bubbles formed by monolayer MoS2, PL can be tuned between 1.72 to 1.81 eV by choosing bulk PtSe2, WS2, MoS2 or graphite as a substrate and its intensity is strongly enhanced by the funneling effect. Strong substrate-dependent quenching of the PL in areas of good contact between MoS2 and the substrate ensures localization of the luminescence to bubbles only; by employing optical reflectivity measurements we identify the mechanisms responsible for the quenching. Given the variety of available monolayer TMDCs and atomically flat substrates and the ease of creating such bubbles, our findings open a venue for making and studying the discussed light-emitting ‘artificial atoms’ that could be used in applications.",
keywords = "exciton funneling, excitons, monolayer transition metal chalcogenides, photoluminescence, strain engineering",
author = "Anastasia Tyurnina and Denis Bandurin and Ekaterina Khestanova and Kravets, {Vasyl G.} and Maciej Koperski and Francisco Guinea and Grigorenko, {Alexander N.} and Geim, {Andre K.} and Grigorieva, {Irina V.}",
year = "2019",
doi = "10.1021/acsphotonics.8b01497",
language = "English",
journal = "ACS Photonics",
issn = "2330-4022",
publisher = "American Chemical Society",

}

RIS

TY - JOUR

T1 - Strained bubbles in van der Waals heterostructures as local emitters of photoluminescence with adjustable wavelength

AU - Tyurnina, Anastasia

AU - Bandurin, Denis

AU - Khestanova, Ekaterina

AU - Kravets, Vasyl G.

AU - Koperski, Maciej

AU - Guinea, Francisco

AU - Grigorenko, Alexander N.

AU - Geim, Andre K.

AU - Grigorieva, Irina V.

PY - 2019

Y1 - 2019

N2 - The possibility to tailor photoluminescence (PL) of monolayer transition metal dichalcogenides (TMDCs) using external factors such as strain, doping and external environment is of significant interest for optoelectronic applications. Strain in particular can be exploited as a means to continuously vary the bandgap. Micrometer-scale strain gradients were proposed for creating ‘artificial atoms’ that can utilize the so-called exciton funneling effect and work, for example, as exciton condensers. Here we describe room-temperature PL emitters that naturally occur whenever monolayer TMDC is deposited on an atomically flat substrate. These are hydrocarbon-filled bubbles which provide predictable, localized PL from well-separated submicron areas. Their emission energy is determined by the built-in strain controlled only by the substrate material, such that both the maximum strain and the strain profile are universal for all bubbles on a given substrate, i.e., independent of the bubble size. We show that for bubbles formed by monolayer MoS2, PL can be tuned between 1.72 to 1.81 eV by choosing bulk PtSe2, WS2, MoS2 or graphite as a substrate and its intensity is strongly enhanced by the funneling effect. Strong substrate-dependent quenching of the PL in areas of good contact between MoS2 and the substrate ensures localization of the luminescence to bubbles only; by employing optical reflectivity measurements we identify the mechanisms responsible for the quenching. Given the variety of available monolayer TMDCs and atomically flat substrates and the ease of creating such bubbles, our findings open a venue for making and studying the discussed light-emitting ‘artificial atoms’ that could be used in applications.

AB - The possibility to tailor photoluminescence (PL) of monolayer transition metal dichalcogenides (TMDCs) using external factors such as strain, doping and external environment is of significant interest for optoelectronic applications. Strain in particular can be exploited as a means to continuously vary the bandgap. Micrometer-scale strain gradients were proposed for creating ‘artificial atoms’ that can utilize the so-called exciton funneling effect and work, for example, as exciton condensers. Here we describe room-temperature PL emitters that naturally occur whenever monolayer TMDC is deposited on an atomically flat substrate. These are hydrocarbon-filled bubbles which provide predictable, localized PL from well-separated submicron areas. Their emission energy is determined by the built-in strain controlled only by the substrate material, such that both the maximum strain and the strain profile are universal for all bubbles on a given substrate, i.e., independent of the bubble size. We show that for bubbles formed by monolayer MoS2, PL can be tuned between 1.72 to 1.81 eV by choosing bulk PtSe2, WS2, MoS2 or graphite as a substrate and its intensity is strongly enhanced by the funneling effect. Strong substrate-dependent quenching of the PL in areas of good contact between MoS2 and the substrate ensures localization of the luminescence to bubbles only; by employing optical reflectivity measurements we identify the mechanisms responsible for the quenching. Given the variety of available monolayer TMDCs and atomically flat substrates and the ease of creating such bubbles, our findings open a venue for making and studying the discussed light-emitting ‘artificial atoms’ that could be used in applications.

KW - exciton funneling

KW - excitons

KW - monolayer transition metal chalcogenides

KW - photoluminescence

KW - strain engineering

U2 - 10.1021/acsphotonics.8b01497

DO - 10.1021/acsphotonics.8b01497

M3 - Article

JO - ACS Photonics

JF - ACS Photonics

SN - 2330-4022

ER -