Method of forming a topside contact to a backside terminal of a semiconductor device
First Claim
1. A method of forming a semiconductor device comprising:
- forming an epitaxial layer on a topside surface of a semiconductor substrate, a sidewall of the epitaxial layer defining a recessed region along a periphery of the semiconductor device;
forming a highly doped implant region in the sidewall of the epitaxial layer and an upper portion of the recessed region;
forming an active device structure in an active area of the epitaxial layer;
forming a termination region in the epitaxial layer, the termination region being disposed between the active area and the recessed region; and
forming an interconnect layer disposed on at least a portion of the termination region, at least a portion of the sidewall of the epitaxial layer, and at least a portion of the recessed region, the interconnect layer being configured as a topside contact to the semiconductor substrate.
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Accused Products
Abstract
A process for forming a vertically conducting semiconductor device includes providing a semiconductor substrate having a topside surface and a backside surface. The semiconductor substrate serves as a terminal of the vertically conducting device for biasing the vertically conducting device during operation. The process also includes forming an epitaxial layer extending over the topside surface of the semiconductor substrate but terminating prior to reaching an edge of the semiconductor substrate so as to form a recessed region along a periphery of the semiconductor substrate. The method also includes forming an interconnect layer extending into the recessed region but terminating prior to reaching an edge of the semiconductor substrate. The interconnect layer electrically contacts the topside surface of the semiconductor substrate in the recessed region to thereby provide a topside contact to the semiconductor substrate.
16 Citations
18 Claims
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1. A method of forming a semiconductor device comprising:
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forming an epitaxial layer on a topside surface of a semiconductor substrate, a sidewall of the epitaxial layer defining a recessed region along a periphery of the semiconductor device; forming a highly doped implant region in the sidewall of the epitaxial layer and an upper portion of the recessed region; forming an active device structure in an active area of the epitaxial layer; forming a termination region in the epitaxial layer, the termination region being disposed between the active area and the recessed region; and forming an interconnect layer disposed on at least a portion of the termination region, at least a portion of the sidewall of the epitaxial layer, and at least a portion of the recessed region, the interconnect layer being configured as a topside contact to the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming a semiconductor device comprising:
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forming an epitaxial layer on a topside surface of a semiconductor substrate, a sidewall of the epitaxial layer defining a recessed region along a periphery of the semiconductor device, the epitaxial layer including a notched active area; forming a highly doped implant region in the sidewall of the epitaxial layer and in an upper portion of the recessed region; forming a termination region in the epitaxial layer, the termination region being disposed around a perimeter of the notched active area; and forming an interconnect layer disposed on at least a portion of the termination region;
at least a portion of the sidewall of the epitaxial layer and at least a portion of the recessed region, the interconnect layer being configured to function as a topside contact to the semiconductor substrate. - View Dependent Claims (12, 13, 14, 15)
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16. A method of forming a semiconductor device comprising:
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forming an epitaxial layer on a topside surface of a semiconductor substrate, a sidewall of the epitaxial layer defining a recessed region along a periphery of the semiconductor device; forming a highly doped implant region in the sidewall of the epitaxial layer and in an upper portion of the recessed region; forming an active device structure in an active area of the epitaxial layer; forming a termination region in the epitaxial layer, the termination region being disposed between the active area and the recessed region around a perimeter of the active area; and forming an interconnect layer disposed on at least a portion of the termination region, at least a portion of the sidewall of the epitaxial layer, and at least a portion of the recessed region, the interconnect layer being configured to function as a topside contact to the semiconductor substrate. - View Dependent Claims (17, 18)
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Specification