Pellicle and method for producing pellicle

Abstract

A pellicle film of a silicon single crystal film and a base substrate supporting the pellicle film are formed of a single substrate using an SOI substrate. The base substrate is provided with an opening whose ratio in area to an exposure region when a pellicle is used on a photomask (an open area ratio) is 60% or more, and provided with a reinforcing frame in a non-exposure region of the base substrate. Since the pellicle film and the base substrate supporting the pellicle film are formed of the single substrate (an integrated structure), and the base substrate is provided with the reinforcing frame, the effect of increased strength is obtained. Moreover, a principal plane of a silicon single crystal film is a crystal plane inclined at 3 to 5° from any lattice plane belonging to {100} planes or {111} planes.

Dependencies are inferred from the claim text.