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METHOD FOR IN SITU PROTECTION OF AN ALUMINUM LAYER AND OPTICAL ARRANGEMENT FOR THE VUV WAVELENGTH RANGE
METHOD FOR IN SITU PROTECTION OF AN ALUMINUM LAYER AND OPTICAL ARRANGEMENT FOR THE VUV WAVELENGTH RANGE
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机译:VUV波长范围的铝层的原位保护和光学布置的方法
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摘要
The invention relates to a method for in situ protection of a surface (7a) of an aluminum layer (7) of a coating (6) – which reflects VUV radiation (11, 21) – of an optical element (4), which is arranged in an interior of an optical arrangement for the VUV wavelength range, against the growth of an aluminum oxide layer (8), comprising: carrying out an atomic layer etching process for layer-by-layer removal of the aluminum oxide layer (8), wherein the atomic layer etching process comprises a surface modification step and a material detachment step, wherein, in the surface modification step, at least one boron halide as surface-modifying reactant is fed to the interior in a pulsed manner, and wherein a plasma (31) is generated in the interior at a surface (8a) of the aluminum oxide layer (8) at least during the material detachment step. The atomic layer etching process is carried out until the aluminum oxide layer (8) attains a thickness (D) of less than 5 nm or the aluminum oxide layer (8) is kept at a thickness (D) of less than 5 nm by the atomic layer etching process. The invention also relates to an optical arrangement for the VUV wavelength range, for example an inspection system or a VUV lithography apparatus.
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