Patent ID: 6297170
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A method, comprising:depositing a reflective layer on a semiconductor substrate;forming a multilayer anti-reflective coating having a first layer and a second layer, the first layer being positioned between the reflective layer and the second layer;depositing a resist layer such that the second layer is positioned between the first layer and the resist layer;exposing selected portions of the resist layer to electromagnetic radiation;developing the resist layer to create a resist mask, the resist mask defining a first region and a second region of the anti-reflective coating and a first region and a second region of the reflective layer; the first region of the anti-reflective coating and the first region of the reflective layer being positioned between the resist mask and the substrate;removing the second region of the anti-reflective coating to expose the second region of the reflective layer; andremoving the resist mask, the first region of the second layer and the second region of the reflective layer to produce a semiconductor device having a patterned reflective layer with a first layer mask thereon;wherein the first layer comprises a different composition than the second layer, the resist mask is removed before the first region of the second layer and the second region of the reflective layer are removed, and the first region of the second layer is removed before the second region of the reflective layer.