Method for manufacturing a micro-electromechanical device...

Semiconductor device manufacturing: process – Making device or circuit responsive to nonelectrical signal

Reexamination Certificate

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C438S050000, C257SE23129

Reexamination Certificate

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10531934

ABSTRACT:
The invention relates to a method of manufacturing a micro-electromechanical device (10), in which are consecutively deposited on a substrate (1) a first electroconductive layer (2) in which an electrode (2A) is formed, a first electroinsulating layer (3) of a first material, a second electroinsulating layer (4) of a second material different from the first material, and a second electroconductive layer (5) in which a second electrode (5A) lying opposite the first electrode is formed which together with the first electrode (2A) and the first insulating layer (3) forms the device (10), in which after the second conductive layer (5) deposited, the second insulating layer (4) is removed by means of an etching agent which is selective with respect to the material of the second conductive layer (5). According to the invention for the first material and the second material materials are selected which are only limitedly selectively etchable with respect to each other and before depositing the second insulating layer (4) a further layer (6) is provided on top of the first insulating layer (3) of a further material that is selectively etchable with respect to the first material. In this way a silicon oxide and a silicon nitride may be applied for the insulating layers (3, 4) and thus the method according to the invention is very compatible with current IC processes. The second insulating layer (4) is preferably removed locally by etching, then the further layer (6) is completely removed by etching and, finally, the second insulating layer (4) is completely removed by etching.

REFERENCES:
patent: 2002/0117668 (2002-08-01), Kim
patent: 2003/0104646 (2003-06-01), Abe
patent: 2003/0232458 (2003-12-01), Kleiman
patent: 2005/0074919 (2005-04-01), Patel et al.
“Wafer-level packaged RF MEMS switches fabricated in a CMOS fab”, pub on pp. 921-924 in the Proceedings of the IEDM (Inter'l Electron Devices Meeting), held from Dec. 3-5, 2001.
J. Buhler et al: “Double Pass Metallization for CMOS Aluminum Actuators”, 8th Interntl Conf. on Solid State Sensors and Actuators and Eurosensors IX. Digest of Tech. Papers.

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