Patent ID: 8921233

Claim:
A method comprising: forming an etching target layer on a substrate comprising a cell region, a connection region, and a peripheral region; forming a sacrificial layer on the etching target layer; patterning the sacrificial layer to form a sacrificial pattern on the cell region and the connection region; forming at least one sidewall spacer on the sacrificial pattern; etching the etching target layer using the at least one sidewall spacer as an etch mask in the cell region and using the at least one sidewall spacer and the sacrificial pattern as an etch mask in the connection region to form a first pattern on the cell region and the connection region; forming a photoresist layer covering the first pattern; patterning the photoresist layer in the peripheral region to form a photoresist pattern on the peripheral region; and etching the etching target layer in the peripheral region using the photoresist pattern as an etch mask to form a second pattern in the peripheral region.