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Core/Shell-Like Localized Emission at Atomically Thin Semiconductor-Au Interface
Kiyoung Jo1,2, Christopher E Stevens3,4, Bongjun Choi1
1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
Nano Letters
|April 9, 2024
Summary
Localized emission from WSe2 nanobubbles was observed. Strong piezoelectric potential at the WSe2-Au Schottky interface spatially confines excitons, enabling control over localized emission for nano and quantum photonics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Atomically thin semiconductors are promising for single-photon sources.
- Localized strain effects on exciton emission are studied, but charge transfer impacts on nanobubble emission are unclear.
Purpose of the Study:
- To investigate localized emission from monolayer WSe2 nanobubbles.
- To understand the role of charge transfer and electronic junctions on nanobubble emission.
Main Methods:
- Near-field studies at room temperature.
- Concurrent analysis of topography, potential, tip-enhanced photoluminescence, and piezo response force microscopy.
- Tuning the WSe2-Au junction from Schottky to Ohmic.
Main Results:
- Observation of core/shell-like localized emission from WSe2 nanobubbles.
- Attribution of emission to strong piezoelectric potential and induced polarity at the WSe2-Au Schottky interface.
- Demonstration of spatial confinement of excitons.
Conclusions:
- Charge transfer significantly impacts nanobubble emission.
- Piezoelectric potential is key for localized emission in WSe2 nanobubbles.
- New approach for manipulating charge confinement and engineering localized emission in nanobubbles for nano/quantum photonics.
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