Patent ID: 7262136
Filing Date: 2007-08-28
Classification: H01L

Abstract:
1. A method for facet etching a semiconductor device to a target depth, the method comprising the steps of: forming a first layer comprising an insulating material on a substrate comprising a plurality of conductive structures, at least some of the conductive structures being placed apart to form spaces between the conductive structures, such that the first layer is in direct contact with the substrate and forms in at least some of the spaces between the conductive structures and the first layer is formed to a thickness at least equal to the target depth; etching the first layer, in a first etch, by directing a plasma beam at the first layer formed in at least some of the spaces between the conductive structures, wherein the plasma is of sufficient energy to sputter material from the first layer and the plasma is an ion of an inert gas thereby forming a facet etch in the first layer formed in the spaces between the conductive structures; terminating the first etch when the first layer has been etched to a predetermined depth which is less than the target depth; etching the first layer, in a second etch, by contacting the first layer with a reactive chemical gas/plasma; and terminating the second etch when the first layer has been etched to the target depth.