Visible light emission from Si/SiO2 multilayers in planar microcavities

D. J. Lockwood, M. W.C. Dharma-wardana, N. Tit, B. T. Sullivan

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

Bright quantum-confined photoluminescence (PL) at visible wavelengths can be obtained from ultrathin-layer Si/SiO2 superlattices. We demonstrate that with the use of an optical resonator the PL peak wavelength and bandwidth can be modified selectively. The strong enhancement and subsequent decrease in the PL intensity in these superlattices with decreasing Si layer thickness has been investigated theoretically. Calculations of the band structure of a Si quantum well separated by crystalline SiO2 barriers using a tight-binding method reveal that the confined conduction and valence bands along the [0 0 1] symmetry direction are essentially dispersionless, are strongly nested, and have a direct band-gap character. The enhanced band-edge density of states and the stronger electron-hole interaction across the low-dielectric barriers lead to a competition between several length scales and produce the PL intensity variation with well width observed.

Original languageEnglish
Pages (from-to)201-204
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume6
Issue number1
DOIs
Publication statusPublished - Feb 2000
Externally publishedYes
Event13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-13) - Ottawa, Ont, Can
Duration: Aug 1 1999Aug 6 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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