Structure and method for making crack stop for 3D integrated circuits
First Claim
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1. A method of forming a 3D IC comprising the steps of:
- providing a bonded structure comprising a first component bonded to a second component using a bonding layer, said first component having a first semiconductor substrate and a first layer with first metallization formed therein, said second component having a second semiconductor substrate that is substantially thinner than the first semiconductor substrate and a second layer with second metallization formed therein, and said bonding layer comprised of a first adhesion layer formed on the first layer and a second adhesion layer formed on the second layer, and said bonded structure having a periphery;
forming a crack stop in the first layer;
forming a passivation layer on said second semiconductor substrate;
forming one or more holes through said passivation layer, said second semiconductor substrate, said second layer, and said bonding layer; and
filling said one or more holes to form a circumferential wall, the circumferential wall contacting said crack stop and extending through said second semiconductor substrate, said second layer, and said bonding layer and adjacent to said periphery.
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Abstract
A structure to prevent propagation of a crack into the active region of a 3D integrated circuit, such as a crack initiated by a flaw at the periphery of a thinned substrate layer or a bonding layer, and methods of forming the same is disclosed.
29 Citations
10 Claims
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1. A method of forming a 3D IC comprising the steps of:
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providing a bonded structure comprising a first component bonded to a second component using a bonding layer, said first component having a first semiconductor substrate and a first layer with first metallization formed therein, said second component having a second semiconductor substrate that is substantially thinner than the first semiconductor substrate and a second layer with second metallization formed therein, and said bonding layer comprised of a first adhesion layer formed on the first layer and a second adhesion layer formed on the second layer, and said bonded structure having a periphery; forming a crack stop in the first layer; forming a passivation layer on said second semiconductor substrate; forming one or more holes through said passivation layer, said second semiconductor substrate, said second layer, and said bonding layer; and filling said one or more holes to form a circumferential wall, the circumferential wall contacting said crack stop and extending through said second semiconductor substrate, said second layer, and said bonding layer and adjacent to said periphery. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of forming a 3D IC comprising the steps of:
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bonding a first component to a second component using a bonding layer to form a bonded structure, said first component having a first semiconductor substrate and a first layer with first metallization formed therein, said second component having a second semiconductor substrate that is substantially thinner than the first semiconductor substrate and a second layer with second metallization formed therein, said bonding layer comprised of a first adhesion layer formed on the first layer joined to a second adhesion layer formed on the second layer, and said bonded structure having a periphery; forming one or more holes through an entire thickness of the second adhesion layer, and an entire thickness of the second layer prior to said bonding step; filling said one or more holes to form a circumferential wall adjacent to said periphery. - View Dependent Claims (8, 9, 10)
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Specification