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

被引：29

作者：

Guo, Xiaoxiao ^{[1
]}

Dai, Dejian ^{[1
]}

Fan, Baolu ^{[1
]}

Fan, Jiyang ^{[1
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 19期

基金：

中国国家自然科学基金;

关键词：

SILICON-CARBIDE; NANOCRYSTALS; PRESSURE;

D O I：

10.1063/1.4901942

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 alpha -> beta 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. (C) 2014 AIP Publishing LLC.

引用

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