Passivation for integrated circuit sensors
First Claim
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1. A mechanical protection layer for a finger contactable integrated circuit comprising:
- a fingerprint sensor having a surface;
a silicon oxide insulating layer disposed over the sensor to electrically isolate the surface; and
a silicon-based layer disposed over the silicon oxide insulating layer, the silicon-based layer having a hardness greater than silicon nitride to provide mechanical protection to the fingerprint sensor during contact with a finger.
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Abstract
A structure and method for creating an integrated circuit passivation comprising, a circuit (16) over which an insulating layer (26 and/or 28) is disposed that electrically and hermetically isolates the circuit (16) and a silicon carbide layer (30) to form a passivation (24) to protect a circuit (16), is disclosed.
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Citations
10 Claims
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1. A mechanical protection layer for a finger contactable integrated circuit comprising:
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a fingerprint sensor having a surface; a silicon oxide insulating layer disposed over the sensor to electrically isolate the surface; and a silicon-based layer disposed over the silicon oxide insulating layer, the silicon-based layer having a hardness greater than silicon nitride to provide mechanical protection to the fingerprint sensor during contact with a finger. - View Dependent Claims (2, 3, 4, 5)
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6. A finger contactable mechanical protection layer for a fingerprint sensor comprising:
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a fingerprint sensor having a surface; a silicon oxide insulating layer disposed over the sensor to electrically isolate the sensor surface; and a finger contactable silicon carbide layer disposed over the silicon oxide insulating layer, wherein the silicon carbide layer provides mechanical protection and scratch resistance from contact during sensor use. - View Dependent Claims (7, 8)
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9. A method of fabricating a fingerprint sensor passivation comprising the steps of:
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forming an integrated circuit fingerprint sensor; depositing a silicon oxide insulating layer on the integrated circuit sensor; and depositing a silicon carbide layer over the silicon oxide insulating layer, wherein the silicon carbide layer protects the integrated circuit sensor from mechanical stress during contact. - View Dependent Claims (10)
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Specification