Patent ID: 6835653
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A method of forming adjacent holes on a semiconductor substrate, wherein the adjacent holes separated by a fine line structure are a first hole and a second hole, the method comprising:providing a semiconductor substrate with an insulating layer on the substrate: forming a step-shaped structure on the surface of the insulating layer, the step-shaped structure comprising a first horizontal surface, a second horizontal surface, and a vertical surface between the first horizontal surface and the second horizontal; depositing a sacrificial layer with an average thickness on the first horizontal surface, the second horizontal surface, and the vertical surface; forming a patterned photoresist layer on portions of the first and second horizontal surface; performing an etch-back process to remove the sacrificial layer not covered by the patterned photoresist layer and form a spacer on the vertical surface; removing the patterned photoresist layer; and using the spacer and the remaining sacrificial layer as a hard mask to remove the insulating layer to form the two adjacent holes.