Patent ID: 6677234
Filing Date: 2004-01-13
Classification: H01L

Abstract:
A method for selectively forming silicide comprising the steps of:providing a body with silicon regions, applying a mask layer that covers a part of the silicon regions, applying a suitable material capable of silicide formation, and forming a silicide by inducing a reaction between said material and silicon of uncovered silicon regions, characterized in that the mask layer is formed by applying a first layer of a first material to said silicon regions, applying a second layer of a second material, applying a patterned resist layer, etching the second layer by means of a first etch process using the patterned resist layer as a mask, removing the patterned resist layer, and etching the first layer using the second layer as a mask by means of a second etch process, different from said first etch process, which second etch process is highly selective relative to the silicon regions.