Photoluminescence from pseudomorphicSi1−yCylayers on Si substrates
作者:
C. Penn,
S. Zerlauth,
J. Stangl,
G. Bauer,
G. Brunthaler,
F. Schäffler,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
(AIP Available online 1998)
卷期:
Volume 16,
issue 3
页码: 1713-1716
ISSN:1071-1023
年代: 1998
DOI:10.1116/1.590040
出版商: American Vacuum Society
关键词: (Si,Ge)
数据来源: AIP
摘要:
We observe near band edge photoluminescence (PL) from pseudomorphicSi/Si1−yCymultiple quantum wells and thickSi1−yCyepilayers, which were grown by molecular beam epitaxy on Si substrates. Pieces of these structures were annealed at temperatures between 500 and 1000 °C to investigate their thermal stability. While annealing at 900 °C or more leads to a reduction of the amount of substitutionally incorporated carbon and to a quenching of the PL signal, annealing at temperatures between 500 and 700 °C results in increased PL intensities and reduced linewidths. Although no decrease in the carbon content is observed under these conditions, we also observe a blue shift of the PL lines after annealing. In addition, increasing the temperature, at which the PL is recorded, leads to a red shift of the lines. We show that these findings are consistent with a recombination model of excitons bound to alloy fluctuations and a homogenization of not statistically distributed carbon atoms upon annealing.
点击下载:
PDF
(96KB)
返 回