Method for forming a semiconductor sensor device
First Claim
1. A method for forming a semiconductor sensor device comprising the steps of:
- providing a substrate;
forming a sacrificial layer over the substrate;
removing part of the sacrificial layer to leave a portion on the substrate;
forming a first isolation layer over the substrate and the portion of the sacrificial layer;
forming a conductive layer over the first isolation layer;
selectively etching the portion of the sacrificial layer to form a cavity between the first isolation layer and the substrate, the cavity providing thermal isolation therebetween;
forming a second isolation layer over the conductive layer; and
forming a chemically sensitive layer over the second isolation layer.
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Accused Products
Abstract
A method for forming a semiconductor sensor device comprises providing a substrate (4) and forming a sacrificial layer (18) over the substrate. The sacrificial layer (18) is then patterned and etched to leave a portion (19) on the substrate (4). A first isolation layer (6) is formed over the substrate (4) and portion (19) of the sacrificial layer and a conductive layer (12), which provides a heater for the sensor device, is formed over the first isolation layer (6). The portion (19) of the sacrificial layer is then selectively etched to form a cavity (10) between the first isolation layer (6) and the substrate (4), the cavity (10) providing thermal isolation between the heater and the substrate.
88 Citations
13 Claims
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1. A method for forming a semiconductor sensor device comprising the steps of:
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providing a substrate; forming a sacrificial layer over the substrate; removing part of the sacrificial layer to leave a portion on the substrate; forming a first isolation layer over the substrate and the portion of the sacrificial layer; forming a conductive layer over the first isolation layer; selectively etching the portion of the sacrificial layer to form a cavity between the first isolation layer and the substrate, the cavity providing thermal isolation therebetween; forming a second isolation layer over the conductive layer; and forming a chemically sensitive layer over the second isolation layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for forming a semiconductor sensor device comprising the steps of:
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providing a substrate; forming a first isolation layer over the substrate; removing part of the first isolation layer and substrate to form a trench; filling the trench with sacrificial material; forming a conductive layer over the first isolation layer and sacrificial material in the trench; selectively etching the sacrificial material in the trench to form a cavity between the conductive layer and the substrate to provide thermal isolation therebetween; forming a second isolation layer over the conductive layer; and forming a chemically sensitive layer over the second isolation layer. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification