Patent ID: 8796155

Claim:
A method of fabricating a substrate, comprising: forming spaced first features over a substrate, the spaced first features having elevationally coincident bases; depositing an alterable material over the spaced first features and altering the alterable material with material from the spaced first features to form altered material on sidewalls of the spaced first features; depositing a first material over the altered material, the first material being of some different composition from that of the altered material and having an elevationally innermost base that is elevationally coincident with the bases of the spaced first features; etching the first material to expose the altered material and forming spaced second features comprising the first material on sidewalls of the altered material; after forming the spaced second features, etching the altered material from between the spaced second features and the spaced first features; and processing the substrate through a mask pattern comprising the spaced first features and the spaced second features.