Patent ID: 7364932
Filing Date: 2008-04-29
Classification: G01J,H01L

Abstract:
1. A method of fabricating an electronic device comprising the steps of: (a) preparing a substrate on which part of the electronic device is disposed, and forming a sacrificial layer which covers the part of the electronic device on a selected region of the substrate; (b) forming a cavity-wall film which covers the sacrificial layer on the substrate; (c) forming at least one opening which runs through the cavity-wall film and reaches the sacrificial layer in the cavity-wall film; (d) selectively etching at least part of the sacrificial layer via the opening, thereby forming a cavity surrounding the part of the electronic device; and (e) forming a sealing member for closing the opening by sputtering, wherein the part of the electronic device is a detecting unit of an infrared sensor, in the step (a), the sacrificial layer is formed from a polysilicon film, and in the step (b), a polysilicon film and a silicon oxide film enwrapping the polysilicon film are formed as the cavity-wall film.