Patent ID: 6221537
Filing Date: 2001-04-24
Classification: G03F

Abstract:
A method of forming a mask for use in applying a pattern to a semiconductor die, comprising the steps of:obtaining a substrate, the substrate having a first material and a second material separated by an etch stop layer, the substrate having a first surface on the first material and a second surface on the second material;depositing a membrane film on the first surface of the substrate adjacent to the first material;patterning the substrate to form an opening through the second surface and through the second material to the etch stop layer and to leave a portion of the second material; andpatterning the etch stop layer in the opening and the first material to the membrane film to form supporting struts, wherein are angled and of reduced height from that of the portion of the second material, of portions of the first material and the second material and to form an open area between the supporting struts; andforming a patterned scattering layer on the first surface, aligned with the open area, and according to the pattern to form the mask.