Patent ID: 8647521
Filing Date: 2014-02-11
Classification: H01L

Abstract:
1. A method for forming micro patterns of a semiconductor device, the method comprising: forming first etch mask patterns extending along a first direction over a substrate, the first etch mask patterns having a first pitch that is larger than a second pitch of target patterns; forming an auxiliary film over the first etch mask patterns, the auxiliary film being conformal to the first etch mask patterns and defining a plurality of first trenches; forming an etch mask film over the auxiliary film, the etch mask film filling the first trenches; performing an etch process for etching the etch mask film, the auxiliary film, and the first etch mask patterns, the etched first etch mask patterns defining a plurality of isolated first etch mask patterns, each of the isolated first etch mask patterns being isolated from adjacent isolated first etch mask patterns along the first direction, the etch mask film remaining within the first trenches between the isolated first etch mask patterns as second etch mask patterns; and removing the auxiliary film exposed by the isolated first etch mask patterns and the second etch mask patterns.