Method of fabrication of endcap chip with conductive, monolithic L-connect for multichip stack
First Claim
1. A method for forming an endcap chip for use in a multichip stack, said method comprising the steps of:
- (a) providing a wafer comprising a substrate having an upper surface and a lower surface;
(b) forming a trench in said wafer, said trench defining in said substrate a substrate edge;
(c) forming a conductive, monolithic L-connect having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said substrate edge, said second leg having a substantially planar outer surface;
(d) separating the endcap chip from said wafer at least partially along said trench such that said endcap chip includes said conductive, monolithic L-connect, said second leg of said conductive, monolithic L-connect residing at an edge surface of said endcap chip, wherein when said endcap chip is employed within said multichip stack, said conductive, monolithic L-connect electrically interconnects metal on an end face of said multichip stack and metal on a side face of said multichip stack, said side face being parallel to said edge surface of said endcap chip.
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Abstract
An endcap chip is provided for a multichip stack comprising multiple integrated circuit chips laminated together. The endcap chip has a substrate with an upper surface and a edge surface, which extends in a plane orthogonal to the upper surface. At least one conductive, monolithic L-connect is disposed over the substrate such that a first leg extends at least partially over the upper surface of the substrate and a second leg extends at least partially over the edge surface of the substrate. When the endcap chip is located at the end of the multichip stack, the at least one conductive, monolithic L-connect electrically connects metal on an end face of the stack to metal on a side face of the stack. A fabrication process is set forth for producing the endcap chip with lithographically defined dimensions.
189 Citations
10 Claims
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1. A method for forming an endcap chip for use in a multichip stack, said method comprising the steps of:
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(a) providing a wafer comprising a substrate having an upper surface and a lower surface; (b) forming a trench in said wafer, said trench defining in said substrate a substrate edge; (c) forming a conductive, monolithic L-connect having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said substrate edge, said second leg having a substantially planar outer surface; (d) separating the endcap chip from said wafer at least partially along said trench such that said endcap chip includes said conductive, monolithic L-connect, said second leg of said conductive, monolithic L-connect residing at an edge surface of said endcap chip, wherein when said endcap chip is employed within said multichip stack, said conductive, monolithic L-connect electrically interconnects metal on an end face of said multichip stack and metal on a side face of said multichip stack, said side face being parallel to said edge surface of said endcap chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for forming a chip for use in a multichip stack, said method comprising the steps of:
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(a) providing a wafer comprising a substrate having an upper surface and a lower surface; (b) forming a trench in said wafer, said trench defining in said substrate a substrate edge; (c) forming a conductive, monolithic L-connect having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said substrate edge, said second leg having a substantially planar outer surface; and (d) separating the chip from said wafer at least partially along said trench such that said chip includes said conductive, monolithic L-connect, said second leg of said conductive, monolithic L-connect residing at an edge surface of said chip, wherein when said chip is employed within said multichip stack, said conductive, monolithic L-connect electrically connects to metal on a side face of said multichip stack, said side face being parallel to said edge surface of said chip.
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Specification