No abstract

No abstract

No abstract

No abstract

Sensors have sandwich stracture metal/porous silicon/crystalhne silicon/Al. The contact metal on porous silicon was from Au and from Pd. Porosity of the samples is 57% and 63%. Low frequency noises before, during and after influence of hydrogen gas flow are studied. Noise spectra of the samples in general have Ij f^ forms with 0.7 < / < 1.

Noise properties of porous silicon/single-crystalline silicon structures under exposure to active gases are investigated for the first time. Current-voltage and noise characteristics of samples are measured. The Al/porous silicon/single-crystalline Si/Al sandwich-structures were placed in a special chamber and the influence of adsorption of various gases on low-frequency noise of the samples was revealed. The adsorption changes the dynamics of the interaction of charge carriers with traps, i.e. the noise characteristics of the samples. The results are encouraging for practical applications of porous silicon structures as gas sensors using measurements of low-frequency noise characteristics.

No abstract

No abstract