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28 April 2008 Noise spectroscopy of porous silicon gas sensors
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We study current-voltages and low-frequency noise characteristics of the metal--porous silicon--silicon single crystal--metal structure with 50% and 73% porosity of porous silicon. The study is performed in dry air and in a mix of dry air with carbon monoxide of different concentrations. The Hooge noise parameter αH and the parameter γ in the frequency dependence of the noise voltage spectral density SU(ƒ) were determined from experimental data. High sensitivity of spectral dependence of noise to gas concentration allows offering powerful method for determination of gas concentration in the air or environment.
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V. M. Aroutiounian, Z. H. Mkhitaryan, A. A. Shatveryan, F. V. Gasparyan, M. Ghulinyan, L. Pavesi, L. B. Kish, and C. G. Granqvist "Noise spectroscopy of porous silicon gas sensors", Proc. SPIE 6943, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense VII, 69430G (28 April 2008);

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