Invention Grant
US07804648B2 Multilayer reflective film coated substrate, manufacturing method thereof, reflective mask blank, and reflective mask 有权
多层反射膜涂布基板,其制造方法,反射掩模板和反射掩模

Multilayer reflective film coated substrate, manufacturing method thereof, reflective mask blank, and reflective mask
Abstract:
A multilayer reflective film coated substrate includes a multilayer under film comprised of Mo/Si alternately-layered films and a multilayer reflective film comprised of Mo/Si alternately-layered films for reflecting exposure light. The multilayer under film and the multilayer reflective film are formed on a substrate in this order. Given that a cycle length of the multilayer under film is d bottom (unit:nm) and a cycle length of the multilayer reflective film is d top (unit:nm), a relationship of a formula (1) is satisfied when d bottom>d top, the formula (1) given by (n+0.15)×d top≦d bottom≦(n+0.9)×d top where n is a natural number equal to or greater than 1.
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