Micro-electro-mechanical device having two buried cavities and manufacturing process thereof
First Claim
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1. A micro-electro-mechanical device, comprising:
- a monolithic body of semiconductor material having a first face and a second face;
a first buried cavity in the monolithic body of semiconductor material;
a sensitive region in the monolithic body facing the first buried cavity;
a movable element over a second cavity that faces the first buried cavity; and
a decoupling trench extending from the first face of the monolithic body as far as the first buried cavity, the decoupling trench separating the sensitive region from a peripheral portion of the monolithic body.
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Abstract
A micro-electro-mechanical device formed in a monolithic body of semiconductor material accommodating a first buried cavity; a sensitive region above the first buried cavity; and a second buried cavity extending in the sensitive region. A decoupling trench extends from a first face of the monolithic body as far as the first buried cavity and laterally surrounds the second buried cavity. The decoupling trench separates the sensitive region from a peripheral portion of the monolithic body.
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Citations
23 Claims
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1. A micro-electro-mechanical device, comprising:
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a monolithic body of semiconductor material having a first face and a second face; a first buried cavity in the monolithic body of semiconductor material; a sensitive region in the monolithic body facing the first buried cavity; a movable element over a second cavity that faces the first buried cavity; and a decoupling trench extending from the first face of the monolithic body as far as the first buried cavity, the decoupling trench separating the sensitive region from a peripheral portion of the monolithic body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for manufacturing a micro-electro-mechanical device, the process comprising:
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forming a first buried cavity in a monolithic body of semiconductor material, wherein forming the first buried cavity forms a sensitive region facing the first buried cavity; forming a second buried cavity in the sensitive region of the monolithic body; and forming a decoupling trench extending from a first face of the monolithic body, the decoupling trench and the first buried cavity being in fluid communication with each other, the decoupling trench laterally surrounding the second buried cavity, the decoupling trench separating the sensitive region from a peripheral portion of the monolithic body. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An electronic apparatus comprising:
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a microprocessor; and a micro-electro-mechanical device, including; a monolithic body of semiconductor material having a first face and a second face; a first buried cavity in the monolithic body of semiconductor material; a sensitive region in the monolithic body facing the first buried cavity; a second cavity buried in the sensitive region; a decoupling trench extending from the first face of the monolithic body as far as the first buried cavity and laterally surrounding the second buried cavity, the decoupling trench separating the sensitive region from a peripheral portion of the monolithic body; and a cap coupled to the monolithic body. - View Dependent Claims (20, 21, 22, 23)
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Specification