Patent ID: 8667430
Filing Date: 2014-03-04
Classification: G03F,G06F,G16Z,Y02P

Abstract:
1. A method of fabricating an integrated circuit, comprising: designing an optical photomask for forming a pre-pattern opening in a photoresist layer on a semiconductor substrate, wherein the photoresist layer and the pre-pattern opening are coated with a self-assembly material that undergoes directed self-assembly (DSA) to form a DSA pattern, and wherein the step of designing the optical photomask comprises: using a computing system, inputting a DSA target pattern; using the computing system, applying a DSA model to the DSA target pattern to generate a first DSA directing pattern; using the computing system, calculating a residual between the DSA target pattern and the DSA directing pattern; and using the computing system, applying the DSA model to the first DSA directing pattern and the residual to generate a second, updated DSA directing pattern, wherein generating the second, updated DSA directing pattern comprises linearizing a self-consistent field theory equation.