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US08642403B1 Replacement contacts for all-around contacts 有权
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Replacement contacts for all-around contacts
Abstract:
In one aspect, a method of forming contacts to source and drain regions in a FET device includes the following steps. A patternable dielectric is deposited onto the device so as to surround each of the source and drain regions. The patternable dielectric is exposed to cross-link portions of the patternable dielectric that surround the source and drain regions. Uncross-linked portions of the patternable dielectric are selectively removed relative to the cross-linked portions of the patternable dielectric, wherein the cross-linked portions of the patternable dielectric form dummy contacts that surround the source and drain regions. A planarizing dielectric is deposited onto the device around the dummy contacts. The dummy contacts are selectively removed to form vias in the planarizing dielectric which are then filled with a metal(s) so as to form replacement contacts that surround the source and drain regions.
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