Patent ID: 11966165
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 5:
6. An immersion exposure tool, comprising:
a project lens;
a bottom lens, comprising tapered sidewalls and straight sidewalls, adjacent to the project lens;
an immersion hood comprising tapered sidewalls, straight sidewalls, and an opening, wherein the opening is around the bottom lens and between the bottom lens and a substrate, wherein the tapered sidewalls of the immersion hood are aligned with the tapered sidewalls of the bottom lens, and wherein the straight sidewalls of the immersion hood are aligned with the tapered sidewalls of the bottom lens; and
a hydrophobic coating on an entire portion of the tapered sidewalls of the bottom lens to prevent direct contact between a processing fluid, that is to be used in the immersion exposure tool, and at least a portion of the bottom lens,
wherein an angle of the tapered sidewalls of the bottom lens is based on at least two of:
an exposure field size range of the immersion exposure tool,
a size of one or more lens components included in upper portion and in a lower portion of the bottom lens, or
a size reduction in a pattern that is to be transferred to the substrate as the pattern is carried by a radiation from the project lens through the bottom lens.