Patent ID: 7932017

Claim:
A method of double patterning a thin film on a substrate, comprising: preparing a film stack on said substrate, said film stack comprising said thin film formed on said substrate, a developable organic planarization layer (OPL) formed on said thin film, a developable anti-reflective coating (ARC) layer formed on said developable OPL, and a layer of photo-resist formed on said developable ARC layer; forming a first image pattern in said developable ARC layer comprising the steps of imaging said developable ARC layer with said first image pattern and developing said developable ARC layer to form said first image pattern; forming said first image pattern in said developable OPL comprising the steps of imaging said developable OPL with said first image pattern and developing said developable OPL to form said first image pattern; forming a second image pattern in said developable ARC layer comprising the steps of imaging said developable ARC layer with said second image pattern and developing said developable ARC layer to form said second image pattern; and forming said second image pattern in said developable OPL comprising the steps of imaging said developable OPL with said second image pattern and developing said developable OPL to form said second image pattern.