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Formation of Silicon Quantum Dots Sheet on a Nonmetallic CaF 2 Surface
Author(s) -
Ito Kenji,
Nakano Hideyuki,
Nakamura Yoshiaki
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001295
Subject(s) - materials science , silicene , quantum dot , x ray photoelectron spectroscopy , monolayer , silicon , substrate (aquarium) , scanning tunneling microscope , layer (electronics) , epitaxy , nanotechnology , optoelectronics , chemical engineering , engineering , oceanography , geology
The research on the atomic layer 2D materials employed in ultrahigh‐speed electronic devices has attracted significant attention and silicene, a monoatomic layer allotrope of Si, is considered the most effective material. For practical device applications, it is necessary to grow silicene on a nonmetallic substrate; however, only the growth of silicene on metallic or semiconductive substrates is reported. In this study, Si quantum dot sheets are grown on a nonmetallic epitaxial CaF 2 surface by the deposition of monolayer thick Si. By depositing Si at a temperature ranging from room temperature to 650 °C, a 2D sheet composed of high‐density quantum dots (7.8 × 10 12 cm −2 ) is obtained. Scanning tunneling spectroscopy and X‐ray photoelectron spectroscopy measurements reveal that Si forms a continuous film containing quantum‐sized dots on the CaF 2 surface.