Patent ID: 6242138
Filing Date: 2001-06-05
Classification: G03F

Abstract:
A method for manufacturing a phase shift mask which comprises a thin film mask pattern formed on a transparent substrate, said mask pattern comprising:a light transmitting portion transmitting light having an intensity capable of substantially contributing to the exposure, anda light translucent portion formed of a thin film transmitting light having intensity substantially not contributing to the exposure and shifting a phase of said transmitted light so that the contrast of said exposure light in an area adjacent to the boundary between said light translucent portion and the light transmitting portion is improved by the difference in phase between said light translucent portion and the light transmitting portionwherein said method comprises the steps of:preparing a transparent substrate;forming a light translucent film on said transparent substrate, wherein said light translucent film consists essentially of nitrogen, metal and silicon, which comprises 34 to 60 atomic % of silicon;forming a resist pattern on the said light translucent thin film;etching said light translucent film by using said resist pattern as a mask to obtain a desired mask pattern comprising the light transmitting portion and the light translucent portion with a boundary between said portions; andrinsing at least the surface of said patterned film with sulfuric acid.