MEMS DEVICE HAVING CONDUCTIVE MICROSTRUCTURES LATERALLY SURROUNDED BY OXIDE MATERIAL
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United States of America Patent
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app pub date -
Apr 16, 2015
filing date -
Jun 25, 2013
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Abstract
A MEMS device includes a first substrate structure and a second substrate structure. The first substrate structure has a conductive microstructure and an oxide material surrounding lateral side of the conductive microstructure. A thickness of the conductive microstructure and a thickness of the oxide material are approximately equivalent. The second substrate structure has an active region of the MEMS device, and the second substrate structure is coupled in spaced apart relationship with the first substrate structure to produce a cavity between the structures. The active region of the MEMS device is suspended above the cavity and the conductive microstructure underlies the cavity. The conductive microstructure is formed from a polysilicon structure layer and a local oxidation of silicon process is implemented to thermally grow the oxide material using the polysilicon of the structural layer. The second substrate structure may be coupled to the first substrate structure by fusion bonding.
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