Patent ID: 7473647
Filing Date: 2009-01-06
Classification: H01L

Abstract:
1. A method of forming a fine pattern of a substrate, comprising: forming a first hard mask pattern comprising a plurality of first line patterns formed on an etch target layer in a first direction with a first pitch; forming a first layer on sidewalls and an upper surface of the first hard mask pattern, such that the first layer includes a top surface where a recess is formed between two adjacent first line patterns; forming a second hard mask pattern comprising a plurality of second line patterns each extending in the first direction within the recess; performing an anisotropic etching process on the first layer using the first line patterns and the second line patterns as an etch mask, thereby exposing the etch target layer disposed between the first line patterns and the second line patterns; and, performing another anisotropic etching process on the etch target layer using the first hard mask pattern and the second hard mask pattern as an etch mask.