Capacitance type humidity sensor with passivation layer
First Claim
1. A capacitance type humidity sensor, comprising:
- a substrate;
two electrodes disposed on the substrate and on the same plane so as to face each other with spacing therebetween;
a passivation layer disposed on the two electrodes so as to cover the two electrodes; and
a humidity-sensitive layer that directly contacts the passivation layer so as to cover the two electrodes, the humidity-sensitive layer having a dielectric constant which changes according to ambient humidity, wherein the spacing is twice or more larger than the film thickness of the passivation layer.
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Abstract
A capacitance type humidity sensor is composed of a substrate, two electrodes, a passivation layer, and a humidity-sensitive layer. The two electrodes are disposed on the substrate and on the same plane, and face each other with spacing therebetween. The passivation layer covers the two electrodes. The humidity-sensitive layer is disposed on the spacing or between the spacing, and the dielectric constant of the humidity-sensitive layer is changed corresponding to humidity. As the spacing is broadened, the hysteresis in the humidity sensor is reduced. Especially, when the spacing is twice or more larger than the film thickness of the passivation layer, the hysteresis is reduced to be less than 10 % RH in relative humidity.
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Citations
9 Claims
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1. A capacitance type humidity sensor, comprising:
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a substrate;
two electrodes disposed on the substrate and on the same plane so as to face each other with spacing therebetween;
a passivation layer disposed on the two electrodes so as to cover the two electrodes; and
a humidity-sensitive layer that directly contacts the passivation layer so as to cover the two electrodes, the humidity-sensitive layer having a dielectric constant which changes according to ambient humidity, wherein the spacing is twice or more larger than the film thickness of the passivation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification