Influence of humidity on transport in porous silicon

Mareš, J.; Krištofik, J.; Hulicius, E.

doi:10.1016/0040-6090(94)05670-9

Cited by 61 publications

(19 citation statements)

References 19 publications

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“…Porous silicon (PS) is an interesting base material to develop a gas sensor due to its high specific surface [1] .Porous silicon sensing properties observed are changes of electrical capacitance and conductance in presence of gases and the quenching of photoluminescence. A high sensitivity of the PS layer was shown for organic vapours with high dipole moment [2,3]. However, the electrical response of the PS layer for these organic vapours can lead to an appreciable differences depending on the oxidation of the PS surface.…”

Section: Introductionmentioning

confidence: 96%

CH _x – porous silicon structures for gas sensing applications

Gabouze

Belhousse

Cheraga

2005

phys. stat. sol. (c)

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We have developed a gas sensor for hydrocarbons using layered structures hydrocarbons /porous silicon. Sensitivity of this device, response time and capacitance response to different gases (ethane, ethylene and propane) have been studied. DC and AC electrical measurements were performed to test the sensor and it has been shown that CH x layer-PS/p-Si structure is modified by the gas reactivity on the PS/CHx surface. Finally, FTIR spectroscopy measurements in different gas environments have shown remarkable change of chemical composition of the sensor material as a result of its interaction with gases.

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Section: Introductionmentioning

confidence: 96%

CH _x – porous silicon structures for gas sensing applications

Gabouze

Belhousse

Cheraga

2005

phys. stat. sol. (c)

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“…On the contrary, as well known from literature [7], humidity strongly influences the sensor response of PS towards NO 2 . For example, when the RH changes from 20% to 40%, the sensor response to 5 ppm of NO 2 decreases from 45 to 10.7.…”

Section: Resultsmentioning

confidence: 49%

Towards a Deeper Comprehension of the Interaction Mechanisms between Mesoporous Silicon and NO2

Boarino

Rocchia

Baratto

et al. 2000

phys. stat. sol. (a)

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The high sensitivity of a room‐temperature porous silicon NO2 sensor has required an investigation of surface dynamics between NO2 and mesoporous silicon. By means of electrical measurements in gas atmosphere and in‐situ FTIR, evidence of a new interaction mechanism strongly affecting the electrical conductivity of the porous silicon (PS) sensors has been found. Absorption bands have been attributed to NO2—, suggesting carrier transfer from the silicon wires to NO2, thanks to its high electronic affinity. The models proposed until now, explaining the high resistivity of mesoporous silicon, strongly support this interpretation.

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“…The optical sensing properties have been measured by keeping the samples in saturated vapor of various solvents in sealed transparent containers, and measuring the PL Discussion Electrical PS sensors are usually sensitive to ambient humidity [11], as confirmed by our measurements (Fig. 5, solid curve).…”

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confidence: 75%

Porous Silicon Microcavities as Optical and Electrical Chemical Sensors

Mulloni

Gaburro

Pavesi

2000

phys. stat. sol. (a)

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The optical and electrical properties of porous silicon microcavities are strongly dependent on the environment. For highly luminescent samples both the luminescence intensity and the peak position are affected by organic substances, which also strongly modify the electrical conductivity, giving the possibility to obtain a multi-parametric optical/electrical sensor. The peak position depends on the refractive index of the organic compound, whereas the luminescence intensity depends on its low frequency dielectric constant. Electrical properties depend on the dipole moment of the molecules. This allows discriminating between different organic substances.

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Influence of humidity on transport in porous silicon

Cited by 61 publications

References 19 publications

CH _x – porous silicon structures for gas sensing applications

CH _x – porous silicon structures for gas sensing applications

Towards a Deeper Comprehension of the Interaction Mechanisms between Mesoporous Silicon and NO2

Porous Silicon Microcavities as Optical and Electrical Chemical Sensors

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Influence of humidity on transport in porous silicon

Cited by 61 publications

References 19 publications

CH x – porous silicon structures for gas sensing applications

CH x – porous silicon structures for gas sensing applications

Towards a Deeper Comprehension of the Interaction Mechanisms between Mesoporous Silicon and NO2

Porous Silicon Microcavities as Optical and Electrical Chemical Sensors

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CH _x – porous silicon structures for gas sensing applications

CH _x – porous silicon structures for gas sensing applications