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Sensing Properties of Porous Silicon Layer for Organic Vapors

다공질 실리콘의 유기가스 검지 특성

  • 김성진 (경남대학교 전기전자공학부) ;
  • 이상훈 (경남대학교 전기전자공학부) ;
  • 최복길 (공주대학교 정보통신공학부)
  • Published : 2002.11.01

Abstract

In this work, porous silicon (PS) layer is investigated as a sensing material to detect organic vapors such as ethanol (called alcohol), methanol, and acetone in low concentrations. To do this, PS sensors were fabricated. They have a membrane structure and comb-type electrodes were used to detect the change of electrical resistance effectively. PS layer on Si substrates was formed by anodization in HF solution of 25%. From fabricated sensors, current-voltage (Ⅰ-Ⅴ) curves were measured for gases evaporated from 0.1 to 0.5% organic solution concentrations at 36$\^{C}$. As the result, all curves showed rectifying behavior due to a diode structure between Si and the PS layer. The conductance of most sensors increased largely at high voltage of 5V, but the built-in potential on the measured Ⅰ-Ⅴ curve was lowered inversely by the adsorption effect of the organic vapors with high dipole moment.

Keywords

References

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