Method and structure for through-silicon via (TSV) with diffused isolation well
First Claim
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1. An integrated circuit structure comprising:
- a substrate of a first dopant impurity type;
a through silicon via (TSV) extending from a top surface of said substrate to a bottom surface of said substrate and filled with a conductive material; and
a well region formed in said substrate surrounding said TSV, said well region comprising a second dopant impurity type and extending from said top surface to said bottom surface and including an inner well portion formed of a first species of said second dopant impurity type and an outer portion formed of a second species of said second dopant impurity type.
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Abstract
A semiconductor device and method for forming the same provide a through silicon via (TSV) surrounded by a dielectric liner. The TSV and dielectric liner are surrounded by a well region formed by thermal diffusion. The well region includes a dopant impurity type opposite the dopant impurity type of the substrate. The well region may be a double-diffused well with an inner portion formed of a first material and with a first concentration and an outer portion formed of a second material with a second concentration. The surrounding well region serves as an isolation well, reducing parasitic capacitance.
43 Citations
13 Claims
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1. An integrated circuit structure comprising:
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a substrate of a first dopant impurity type; a through silicon via (TSV) extending from a top surface of said substrate to a bottom surface of said substrate and filled with a conductive material; and a well region formed in said substrate surrounding said TSV, said well region comprising a second dopant impurity type and extending from said top surface to said bottom surface and including an inner well portion formed of a first species of said second dopant impurity type and an outer portion formed of a second species of said second dopant impurity type. - View Dependent Claims (2, 3, 4, 5, 12, 13)
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6. An integrated circuit structure comprising:
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a substrate of a first dopant impurity type; a through silicon via (TSV) extending from a top surface of said substrate to an opposed bottom surface of said substrate and filled with a conductive material; a high concentration region of said first dopant impurity type surrounding said TSV and a well region of a second dopant impurity type surrounding said high concentration region, said high concentration region having a first dopant concentration greater than a second dopant concentration in said well region and each of said well region and said high concentration region extending from said top surface to said opposed bottom surface of said substrate. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification