Patent ID: 8198157

Claim:
A method of forming a non-volatile memory device, the method comprising: forming an etch target layer on a substrate; forming first hard mask patterns including a plurality of odd word line patterns between first and second select line patterns, wherein about a same spacing is provided between the first select line pattern and a first odd word line pattern, between adjacent odd word line patterns, and between a last odd word line pattern and the second select line pattern, wherein the first hard mask pattern comprises a first material; forming a sacrificial mask layer on the first hard mask pattern, wherein gaps remain between portions of the sacrificial mask layer on sidewalls of adjacent ones of the odd word line patterns, wherein the sacrificial mask layer comprises a second material, and wherein the first and second materials have different compositions; forming second hard mask patterns on the sacrificial mask layer, wherein the second hard mask patterns includes a dummy word line pattern between the first select line pattern and the first odd word line pattern and includes even word line patterns between adjacent odd word line patterns and between the last odd word line pattern and the second select line pattern, wherein the second hard mask pattern comprises a third material, and wherein the second and third materials have different compositions; removing portions of the sacrificial mask layer between the first and second hard mask patterns so that portions of the etch target layer are exposed between the first and second hard mask patterns; and etching portions of the etch target layer exposed between the first and second hard mask patterns.