The origin of efficient luminescence in highly porous silicon

The efficient visible luminescence of highly porous silicon is identified using photoluminescence spectroscopy. The observation of momentum-conserving phonon satellites of crystalline silicon shows beyond doubt that crystalline silicon is the luminescent material. We report a weak three-phonon satel...

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Bibliographic Details
Published in:Journal of luminescence 1994-04, Vol.60-61, p.297-301
Main Authors: Nash, K.J., Calcott, P.D.J., Canham, L.T., Kane, M.J., Brumhead, D.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Excitons and related phenomena
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other solid inorganic materials
Photoluminescence
Physics
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Summary:The efficient visible luminescence of highly porous silicon is identified using photoluminescence spectroscopy. The observation of momentum-conserving phonon satellites of crystalline silicon shows beyond doubt that crystalline silicon is the luminescent material. We report a weak three-phonon satellite in photoluminescence excitation spectra of porous silicon. This is a manifestation of the weak two-phonon momentum-conserving transitions of crystalline silicon. The exchange splitting of the luminescent exciton is dramatically enhanced by quantum confinement, in agreement with theoretical predictions.
ISSN:0022-2313
1872-7883
DOI:10.1016/0022-2313(94)90150-3