Patent ID: 9698015
Date: 2017-07-04
CPC Classifications: H01L

Claim:
1. A method for patterning a substrate, comprising: forming a hardmask layer over the substrate; forming first line clusters along a first direction, wherein the first line clusters are separated by parallel gaps, each of the first line clusters comprises a core line formed from a core material and first spacers formed on sidewalls of the core line, the first spacers fabricated from a first material, wherein the core material is selected from a group consisting of amorphous silicon, amorphous silicon oxide, amorphous carbon, polycrystalline silicon and silicon nitride, wherein forming the first line clusters further comprises; forming the core lines over the hardmask layer; depositing the first material over the core lines by an atomic layer deposition process; forming the first spacers by selectively etching the first material to expose the core lines and the hardmask layer; depositing a second material over the core lines and the first spacers by an atomic layer deposition process; and forming second spacers by selectively etching the second material to expose the core lines, the first spacers and the hardmask layer; forming a gap fill layer to planarize the first line clusters; and forming second line clusters over the gap fill layer along a second direction, wherein the second direction substantially traverses the first direction, each of the second line dusters comprises a traverse core line and at least first traverse spacers formed on sidewalls of the transverse core line.