Light emission from three-dimensional silicon-germanium nanostructures

D. J. Lockwood, J. M. Baribeau, E. K. Lee, H. Y. Chang, L. Tsybeskov

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Three-dimensional SiGe nanostructures grown on Si using molecular beam epitaxy exhibit photoluminescence (PL) in the important spectral range of 1.3-1.6 μm. At a higher level of photo-excitation, thermal quenching of the PL intensity is suppressed and the previously accepted type II energy band alignment at Si/SiGe cluster hetero-interfaces no longer controls radiative carrier recombination. Instead, a dynamic type I energy band alignment governs the strong decrease in carrier radiative lifetime and further increase in the luminescence quantum efficiency. In contrast to the strongly temperature dependent and slow radiative carrier recombination found in bulk Si, Auger mediated PL emanating from the nanometer-thick Si layers is found to be nearly temperature independent with a radiative lifetime approaching 10-8 s, which is comparable to that found in direct band gap III-V semiconductors. Such nanostructures are thus potentially useful as CMOS compatible light emitters and in optical interconnects.

Original languageEnglish (US)
Title of host publicationApplications of Group IV Semiconductor Nanostructures
PublisherMaterials Research Society
Number of pages12
ISBN (Print)9781615677719
StatePublished - 2008
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: Dec 2 2008Dec 4 2008

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2008 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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