Method of manufacturing a semiconductor device using an etchant
First Claim
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1. A method of manufacturing a semiconductor device, comprising:
- forming a dielectric layer on a substrate having a first region and a second region;
forming a capping layer on the dielectric layer; and
forming a capping layer pattern by selectively etching the capping layer using an etchant from one of the first and the second regions of the substrate, the etchant including about 0.01 to 0.18 percent by weight of an acid, about 10 to 40 percent by weight of a fluoride salt, and a solvent.
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Abstract
In an etchant for etching a capping layer having etching selectivity with respect to a dielectric layer, the capping layer changes compositions of the dielectric layer, to thereby control a threshold voltage of a gate electrode including the dielectric layer. The etchant includes about 0.01 to 3 percent by weight of an acid, about 10 to 40 percent by weight of a fluoride salt and a solvent. Accordingly, the dielectric layer is prevented from being damaged by the etching process for removing the capping layer and the electric characteristics of the gate electrode are improved.
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19 Claims
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1. A method of manufacturing a semiconductor device, comprising:
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forming a dielectric layer on a substrate having a first region and a second region; forming a capping layer on the dielectric layer; and forming a capping layer pattern by selectively etching the capping layer using an etchant from one of the first and the second regions of the substrate, the etchant including about 0.01 to 0.18 percent by weight of an acid, about 10 to 40 percent by weight of a fluoride salt, and a solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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