Patent ID: 8110340

Claim:
A method of forming micro patterns of a semiconductor device, the method comprising: providing a semiconductor substrate, wherein the semiconductor substrate includes a first region and a second region; forming first auxiliary patterns over the semiconductor substrate, wherein the first auxiliary patterns include first patterns in the first region and second patterns in the second region; forming an etch mask layer along a surface of a resulting structure after formation the first auxiliary pattern; forming a second auxiliary layer over the etch mask layer; forming second photoresist patterns over the second auxiliary layer, wherein the second photoresist patterns are formed on portions of the first auxiliary patterns and portions of the etch mask layer in the second region; etching the second auxiliary layer using the second photoresist patterns as an etch mask to form second auxiliary patterns that expose portions of the etch mask layer formed on the first auxiliary patterns; removing the exposed etch mask layer, thereby exposing top surfaces of the first auxiliary patterns; and etching portions of the etch mask layer to form first target patterns in the first region and second target patterns in the second region, wherein the second target patterns include at least a portion of the second auxiliary patterns.