Patent ID: 6607992
Filing Date: 2003-08-19
Classification: G03F,H01L,Y10T

Abstract:
An antireflection coating provided between an underlying layer and a resist in a semiconductor device manufacturing process, said antireflection coating comprising:a lower plasma silicon nitride film provided on said underlying layer, said lower plasma silicon nitride film being formed by a plasma chemical vapor deposition and containing more silicon than stoichiometric silicon nitride (Si3N4); and an upper plasma silicon nitride film provided on said lower plasma silicon nitride film, said upper plasma silicon nitride film being formed by said plasma chemical vapor deposition and containing more silicon than said stoichiometric silicon nitride (Si3N4); said lower plasma silicon nitride film having a complex index of refraction in which the real part and the imaginary part have values respectively in the range of not less than 1.9 nor more than 2.5 and in the range of not less than 0.9 nor more than 1.7, said lower plasma silicon nitride film having a thickness in the range of not less than 20 nm nor more than 60 nm, said upper plasma silicon nitride film having a complex index of refraction in which the real part and the imaginary part have values respectively in the range of not less than 1.7 nor more than 2.4 and in the range of not less than 0.15 nor more than 0.75, said upper plasma silicon nitride film having a thickness in the range of not less than 10 nm nor more than 40 nm.