REFLECTIVE OPTICAL ELEMENT AND METHOD FOR OPERATING AN EUV LITHOGRAPHY APPARATUS
    11.
    发明申请
    REFLECTIVE OPTICAL ELEMENT AND METHOD FOR OPERATING AN EUV LITHOGRAPHY APPARATUS 审中-公开
    反射光学元件和操作EUV光刻设备的方法

    公开(公告)号:US20120250144A1

    公开(公告)日:2012-10-04

    申请号:US13436338

    申请日:2012-03-30

    IPC分类号: G02B5/08

    摘要: In order to reduce the adverse influence of contamination composed of silicon dioxide, hydrocarbons and/or metals within an EUV lithography apparatus on the reflectivity, a reflective optical element (50) for the extreme ultraviolet wavelength range having a reflective surface (59) is proposed, wherein the multilayer coating of the reflective surface (59) has a topmost layer (56) composed of a fluoride. The contaminations mentioned, which deposit on the reflective optical element (50) during the operation of the EUV lithography apparatus, are converted into volatile compounds by the addition of at least one of the substances mentioned hereinafter: atomic hydrogen, molecular hydrogen, perfluorinated alkanes such as e.g. tetrafluoromethane, oxygen, nitrogen and/or helium.

    摘要翻译: 为了减少由EUV光刻设备内的二氧化硅,碳氢化合物和/或金属构成的污染物对反射率的不利影响,提出了一种具有反射表面(59)的用于极紫外波长范围的反射光学元件(50) ,其中所述反射表面(59)的多层涂层具有由氟化物构成的最顶层(56)。 在EUV光刻设备的操作期间沉积在反射光学元件(50)上的污染物通过添加至少一种以下提及的物质转化为挥发性化合物:原子氢,分子氢,全氟化烷烃 例如 四氟甲烷,氧,氮和/或氦。