skip to main content

SciTech ConnectSciTech Connect

Title: Experimental evidence of α → β phase transformation in SiC quantum dots and their size-dependent luminescence

Phase transformation can occur among different SiC polytypes under extreme conditions such as high pressure or temperature. It remains unknown whether phase transformation can occur under normal conditions. We demonstrate that the α → β phase transformation can occur at ambient temperature and pressure in nanoscale SiC. The microstructural characterization and light absorption and emission spectroscopy demonstrate the occurrence of this phase transformation. It is found that the quantum-confinement luminescence dominates in larger SiC quantum dots (QDs) and the surface-defect luminescence dominates in ultrasmall SiC QDs. The rare phenomenon of multiple-phonon-assisted light absorption is observed in the SiC QDs.
Authors:
; ; ;  [1]
  1. Department of Physics, Southeast University, Nanjing 211189 (China)
Publication Date:
OSTI Identifier:
22391970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMBIENT TEMPERATURE; CRYSTAL DEFECTS; EMISSION SPECTROSCOPY; LUMINESCENCE; MICROSTRUCTURE; PHASE TRANSFORMATIONS; PHONONS; QUANTUM DOTS; SILICON CARBIDES; SURFACES