Invention Grant
- Patent Title: Reflective mask blank, reflective mask, method of manufacturing reflective mask blank, and method of manufacturing reflective mask
-
Application No.: US18444020Application Date: 2024-02-16
-
Publication No.: US12105412B2Publication Date: 2024-10-01
- Inventor: Daijiro Akagi , Hiroaki Iwaoka , Wataru Nishida , Ichiro Ishikawa , Kenichi Sasaki
- Applicant: AGC Inc.
- Applicant Address: JP Tokyo
- Assignee: AGC Inc.
- Current Assignee: AGC Inc.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP 21214753 2021.12.28
- Main IPC: G03F1/24
- IPC: G03F1/24

Abstract:
A reflective mask blank for EUV lithography includes a substrate; a multilayer reflective film that reflects EUV light; a protection film that protects the multilayer reflective film; and an absorption film that absorbs the EUV light. The substrate, the multilayer reflective film, the protection film, and the absorption film are arranged in this order from bottom to top. The protection film includes an upper layer made of a rhodium-based material containing Rh as a main component that contains only Rh, or contains Rh and at least one element selected from a group consisting of N, O, C, B, Ru, Nb, Mo, Ta, Ir, Pd, Zr, and Ti; and a lower layer satisfying a condition
k
k
Public/Granted literature
Information query