Patent ID: 8778571

Claim:
A method of manufacturing an EUV mask comprising at least a substrate, a multilayer film formed on the substrate, an absorber pattern formed on the multilayer film, and an electrically conductive film formed on a back surface of the substrate, the method comprising: (a) preparing the substrate; (b) depositing a first multilayer film on the substrate; (c) carrying out a defect inspection with respect to the substrate after (b); (d) performing, depending on a result of the defect inspection: (d1) in a case where defects comprise mixed defects including a recessed defect and a protruded defect and a largest defect among the mixed defects is the recessed defect, a second multilayer film is deposited on the first multilayer film by using a film forming method using a smoothing method and a third multilayer film is deposited on the second multilayer film by using a film forming method using a conformal method; and (d2) in a case where defects comprise the mixed defects and a largest defect among the mixed defects is the protruded defect, a fourth multilayer film is deposited on the first multilayer film by using the film forming method using the conformal method and a fifth multilayer film is further deposited on the fourth multilayer film by using the film forming method using the smoothing method; and (e) forming the absorber pattern on the third multilayer film or the fifth multilayer film, and forming the electrically conductive film on the back surface of the substrate.