Anomalous photoluminescence from 3C-SiC grown on Si(111) by rapid thermal chemical vapor deposition
作者:
H. W. Shim,
K. C. Kim,
Y. H. Seo,
K. S. Nahm,
E.-K. Suh,
H. J. Lee,
Y. G. Hwang,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 13
页码: 1757-1759
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118648
出版商: AIP
数据来源: AIP
摘要:
Single crystal 3C-SiC epitaxial films are grown on Si(111) surfaces using tetramethylsilane by rapid thermal chemical vapor deposition. Strong blue/green photoluminescence (PL) was observed at room temperature from the free films of SiC prepared by etching the Si substrate. The main PL peak energy varies from 2.1 to 2.4 eV with full widths at half-maximum between 450 and 500 meV, depending on the growth condition, excitation wavelength and excitation light intensity. A weak peak at 3.0 eV also appeared. The infrared (IR) spectra of free films of SiC exhibit modes associated with CH and OH groups. We also compared PL characteristics of free films of SiC with those from porous SiC produced by anodization of SiC/Si to determine the origin of the PL. Porous SiC shows a PL peak centered at 1.9 eV, different from those in SiC. From the analysis of the IR spectra and scanning electron microscopic images, we tentatively suggest that the origin of the PL from free films of SiC might be associated with an OH group adsorbed on defects or some localized states as is the case for an amorphous SixC1−xalloy. ©1997 American Institute of Physics.
点击下载:
PDF
(172KB)
返 回