CO sub(2) detection with CN sub(x) thin films deposited on porous silicon

In recent years, porous silicon (PSi) has attracted a great deal of attention for sensing applications. However, the high reactivity of PSi surfaces causes serious problems of stability. In this work, we developed new thin films that can serve as stabilizer of PSi for CO sub(2) gas sensors developme...

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Bibliographic Details
Published in:Materials science in semiconductor processing 2015-01, Vol.29, p.367-371
Main Authors: Zouadi, N, Messaci, S, Sam, S, Bradai, D, Gabouze, N
Format: Article
Language:English
Subjects:
Aluminum
Carbon dioxide
Deposition
Porous silicon
Semiconductors
Sensors
Silicon
Thin films
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Summary:In recent years, porous silicon (PSi) has attracted a great deal of attention for sensing applications. However, the high reactivity of PSi surfaces causes serious problems of stability. In this work, we developed new thin films that can serve as stabilizer of PSi for CO sub(2) gas sensors development. PSi surface was coated with carbon nitride (CN sub(x)) film which is one of the most important interfering to stabilize the PSi layer. CN sub(x) film was deposited by pulsed laser ablation. The effect of CO sub(2) gas on the sensor response was investigated for different polarization voltages. The electrical properties of (Al/CN sub(x)/PSi/Si) structure were modified in the presence of the gas. The device shows a high sensitivity against CO sub(2) gas. Furthermore, the current variation of the sensor as a function of time has been investigated. The results show that the Al/CN sub(x)/PSi/Si structure becomes stable after the first two weeks.
ISSN:1369-8001
DOI:10.1016/j.mssp.2014.07.023