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Organic Molecules as Origin of Visible-Range Single Photon Emission from Hexagonal Boron Nitride and Mica

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Title
Organic Molecules as Origin of Visible-Range Single Photon Emission from Hexagonal Boron Nitride and Mica
Author(s)
Michael Neumann; Xu Wei; Morales-Inostroza, Luis; Seunghyun Song; Sung-Gyu Lee; Watanabe, Kenji; Taniguchi, Takashi; Götzinger, Stephan; Young Hee Lee
Publication Date
2023-06
Journal
ACS Nano, v.17, no.12, pp.11679 - 11691
Publisher
American Chemical Society
Abstract
The discovery of room-temperature single-photon emitters (SPEs) hosted by two-dimensional hexagonal boron nitride (2D hBN) has sparked intense research interest. Although emitters in the vicinity of 2 eV have been studied extensively, their microscopic identity has remained elusive. The discussion of this class of SPEs has centered on point defects in the hBN crystal lattice, but none of the candidate defect structures have been able to capture the great heterogeneity in emitter properties that is observed experimentally. Employing a widely used sample preparation protocol but disentangling several confounding factors, we demonstrate conclusively that heterogeneous single-photon emission at ∼2 eV associated with hBN originates from organic molecules, presumably aromatic fluorophores. The appearance of those SPEs depends critically on the presence of organic processing residues during sample preparation, and emitters formed during heat treatment are not located within the hBN crystal as previously thought, but at the hBN/substrate interface. We further demonstrate that the same class of SPEs can be observed in a different 2D insulator, fluorophlogopite mica. © 2023 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/13758
DOI
10.1021/acsnano.3c02348
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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