Patent ID: 8445184

Claim:
A pattern formation method, comprising the steps of: (a) forming a first resist film on a substrate; (b) selectively irradiating the first resist film with first exposure light and performing first development, thereby forming a first pattern in a first region including an interconnect trench pattern and forming a first dummy pattern in a second region connected to the first region and having a pattern density lower than that of the interconnect trench pattern; (c) hardening the first resist film in which the first pattern and the first dummy pattern are formed; (d) forming a second resist film on the hardened first resist film, after step (c) has been performed; and (e) selectively irradiating the second resist film with second exposure light and performing second development, thereby forming a second pattern in the first region, wherein in step (e), an opening made of the first pattern and the second pattern and including the interconnect trench pattern is formed in the first region, whereas in the second region, an opening in the first dummy pattern is filled with the second resist film.