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Ultraviolet light from porous silicon by a microscopic discharge

: Kozlowski, F.; Steiner, P.; Sauter, M.; Lang, W.

Journal of luminescence (1993)
ISSN: 0022-2313
European Materials Research Society (Meeting) <1993, Strasbourg>
Fraunhofer IFT; 2000 dem IZM eingegliedert
Gasentladung; Modell; poröses Silizium; UV-Licht

We discovered that some porous silicon samples show a characteristic line spectrum in the near UV ,and violet spectral region. The violet part of the light can be clearly seen with the naked eye in the darkened laboratory at ambient pressure. This phenomenon has a completely different origin than the known luminescence of this material in the visible region and the near IR. While visible luminescence starts at volta-ges of some volts, UV line emission starts at a threshold voltage of about 80 V. The UV spectrum emitted from porous silicon is identical to the spectrum of a low pressure RF Nsub2-plasma (for the resolution of the spectrograph) thus proving that a stabte plasma discharge can be established in the pores of porous silicon. Especially at higher voltages, ozone is produced. In the following paper we present some of the fundamental optical and electrical properties of the samples and suggest a model for the origin of the plasma discharge.