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Title: Photon absorption and emission properties of 7 Å SiC nanoclusters: Electronic gap, surface state, and quantum size effect

Abstract

People know little experimentally about the physical properties of the SiC nanoclusters with sizes of a couple of angstroms. Herein, we study the electronic structure and light absorption/emission properties of the SiC nanoclusters with an average diameter of 7 Å that are fabricated by diminishing the sizes of the SiC microcrystals under high pressure and high temperature. The results reveal that the SiC nanoclusters have an indirect energy gap of 5.1 eV. Unlike the case of larger SiC nanocrystals, the luminescence of the SiC nanoclusters is dominated by two types of oxygen-related surface defects, and the maximum of their photoluminescence/photoluminescence excitation spectrum lies at 4.1/3.3 and 3.8/3.0 eV, respectively. The energy gap of the SiC nanoparticles with reference to bulk value is found to be inversely proportional to the diameter to the power 0.97, which shows slower increase of energy gap with decreasing size than what is predicted by using the first-principles calculations.

Authors:
; ; ; ;  [1]
  1. Department of Physics and Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189 (China)
Publication Date:
OSTI Identifier:
22590634
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ELECTRONIC STRUCTURE; ENERGY GAP; EXCITATION; NANOPARTICLES; NANOSTRUCTURES; OXYGEN; PHOTOLUMINESCENCE; PHOTONS; PHYSICAL PROPERTIES; SILICON CARBIDES; SURFACES

Citation Formats

Guo, Xiaoxiao, Chen, Xifang, Fan, Baolu, Zhang, Yumeng, and Fan, Jiyang, E-mail: jyfan@seu.edu.cn. Photon absorption and emission properties of 7 Å SiC nanoclusters: Electronic gap, surface state, and quantum size effect. United States: N. p., 2016. Web. doi:10.1063/1.4955125.
Guo, Xiaoxiao, Chen, Xifang, Fan, Baolu, Zhang, Yumeng, & Fan, Jiyang, E-mail: jyfan@seu.edu.cn. Photon absorption and emission properties of 7 Å SiC nanoclusters: Electronic gap, surface state, and quantum size effect. United States. doi:10.1063/1.4955125.
Guo, Xiaoxiao, Chen, Xifang, Fan, Baolu, Zhang, Yumeng, and Fan, Jiyang, E-mail: jyfan@seu.edu.cn. Mon . "Photon absorption and emission properties of 7 Å SiC nanoclusters: Electronic gap, surface state, and quantum size effect". United States. doi:10.1063/1.4955125.
@article{osti_22590634,
title = {Photon absorption and emission properties of 7 Å SiC nanoclusters: Electronic gap, surface state, and quantum size effect},
author = {Guo, Xiaoxiao and Chen, Xifang and Fan, Baolu and Zhang, Yumeng and Fan, Jiyang, E-mail: jyfan@seu.edu.cn},
abstractNote = {People know little experimentally about the physical properties of the SiC nanoclusters with sizes of a couple of angstroms. Herein, we study the electronic structure and light absorption/emission properties of the SiC nanoclusters with an average diameter of 7 Å that are fabricated by diminishing the sizes of the SiC microcrystals under high pressure and high temperature. The results reveal that the SiC nanoclusters have an indirect energy gap of 5.1 eV. Unlike the case of larger SiC nanocrystals, the luminescence of the SiC nanoclusters is dominated by two types of oxygen-related surface defects, and the maximum of their photoluminescence/photoluminescence excitation spectrum lies at 4.1/3.3 and 3.8/3.0 eV, respectively. The energy gap of the SiC nanoparticles with reference to bulk value is found to be inversely proportional to the diameter to the power 0.97, which shows slower increase of energy gap with decreasing size than what is predicted by using the first-principles calculations.},
doi = {10.1063/1.4955125},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 1,
volume = 109,
place = {United States},
year = {2016},
month = {7}
}