Core/Shell-Like Localized Emission at Atomically Thin Semiconductor–Au Interface

Jo, Kiyoung; Stevens, Christopher E.; Choi, Bongjun; El-Khoury, Patrick Z.; Hendrickson, Joshua R.; Jariwala, Deep

doi:10.1021/acs.nanolett.3c03790

Title: Core/Shell-Like Localized Emission at Atomically Thin Semiconductor–Au Interface

Journal Article · 08 April 2024 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.3c03790 · OSTI ID:2440211

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^[2]; Choi, Bongjun ^[3];

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Univ. of Pennsylvania, Philadelphia, PA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
KBR Inc., Beavercreek, OH (United States); Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)

Localized emission in atomically thin semiconductors has sparked significant interest as single-photon sources. Despite comprehensive studies into the correlation between localized strain and exciton emission, the impacts of charge transfer on nanobubble emission remains elusive. Here, in this paper, we report the observation of core/shell-like localized emission from monolayer WSe₂ nanobubbles at room temperature through near-field studies. By altering the electronic junction between monolayer WSe₂ and the Au substrate, one can effectively adjust the semiconductor to metal junction from a Schottky to an Ohmic junction. Through concurrent analysis of topography, potential, tip-enhanced photoluminescence, and a piezo response force microscope, we attribute the core/shell-like emissions to strong piezoelectric potential aided by induced polarity at the WSe₂–Au Schottky interface which results in spatial confinement of the excitons. Our findings present a new approach for manipulating charge confinement and engineering localized emission within atomically thin semiconductor nanobubbles. These insights hold implications for advancing the nano and quantum photonics with low-dimensional semiconductors.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2440211

Report Number(s):: PNNL-SA--193875

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 16 Vol. 24; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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77 NANOSCIENCE AND NANOTECHNOLOGY
charge transfer
localized emission
piezoelectricity
semiconductor-metal interface
tip-enhanced scanning probe technique

Title: Core/Shell-Like Localized Emission at Atomically Thin Semiconductor–Au Interface

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