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Method for fabricating a sealed cavity microstructure










Image Number 17 for United States Patent #7863063.

A method for fabricating a sealed cavity microstructure comprises the steps of: forming an insulation layer with a micro-electro-mechanical structure on an upper surface of a silicon substrate, the micro-electro-mechanical structure includes at least one suspended structure and at least one conductive structure between which is disposed a spacer region; after an etching, filling a sacrificial layer into the spacer region and on the surface of the conductive structure; forming holes in the sacrificial layer correspondingly to the conductive structure; depositing a cap layer into the holes and the surface; after removing the sacrificial layer, utilizing the clearance of the cap layer to carry out a further etching to realize the suspension of the micro-electro-mechanical structure; and finally, utilizing a sealing layer to achieve the sealing effect. By such arrangements, the exposure of the micro-electro-mechanical structure can be effectively prevented, and the final package cost can be reduced.








 
 
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