Haynes and Boone, LLP
Method of etching a layer of a semiconductor device using an etchant layer
A method of semiconductor fabrication including an etching process is provided. The method includes providing a substrate and forming a target layer on the substrate. An etchant layer is formed on the target layer. The etchant layer reacts with the target layer and etches a portion of the target layer. In an embodiment, an atomic layer of the target layer is etched. The etchant layer is then removed from the substrate. The process may be iterated any number of times to remove a desired amount of the target layer. In an embodiment, the method provides for decreased lateral etching. The etchant layer may provide for improved control in forming patterns in thin target layers such as, capping layers or high-k dielectric layers of a gate structure.
Taiwan Semiconductor Manufacturing Company, Ltd.
H H H
H01L H01L H01L
additional inventional inventional
Ching-Yu Yi-Hsing Ryan Chia-Jen
Chang Chen Chen