Hybrid interconnects and method of forming the same
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United States of America Patent
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Aug 29, 2017
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app pub date -
Jul 6, 2016
filing date -
Jul 6, 2016
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Abstract
A method for manufacturing a semiconductor device includes forming a trench in at least one dielectric layer; and forming an interconnect structure in the trench, wherein forming the interconnect structure includes forming a first conductive layer on a bottom surface of the trench, and partially filling the trench, and forming a second conductive layer on the first conductive layer, and filling a remaining portion of the trench, wherein the second conductive layer comprises a different material from the first conductive layer, and wherein an amount of the first conductive layer in the trench is controlled so that an aspect ratio of the second conductive layer has a value that is determined to result in columnar grain boundaries in the second conductive layer.
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