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    • 6. 发明申请
    • METHOD FOR OPTIMIZING A PROTECTIVE LAYER SYSTEM FOR AN OPTICAL ELEMENT, OPTICAL ELEMENT AND OPTICAL SYSTEM FOR EUV LITHOGRAPHY
    • 用于优化光学元件的保护层系统的方法,用于EUV光刻的光学元件和光学系统
    • WO2013124224A1
    • 2013-08-29
    • PCT/EP2013/053091
    • 2013-02-15
    • CARL ZEISS SMT GMBHASML NETHERLANDS B.V.
    • EHM, Dirk, HeinrichHUIJBREGTSE, JeroenSTORM, Arnoldus, JanTE SLIGTE, EdwinGRABER, TinaBEKMANN, Hermanus, Hendricus, Petrus, Theodorus
    • G03F7/20G02B1/10
    • G03F7/70958G02B1/105G02B1/14
    • The invention relates to a method for optimizing a protective layer system (59) for an EUV radiation (6) reflecting multilayer system (51) of an optical element (50), comprising the following steps: selecting a material for a topmost layer (57) of the protective layer system (59) from a group of chemical compounds comprising: oxides, carbides, nitrides, silicates and borides, wherein selecting the material for the topmost layer (57) is effected depending on an enthalpy of formation of the respective chemical compound. The invention also relates to an optical element (50), comprising: an EUV radiation (6) reflecting multilayer system (51), and a protective layer system (59) having a topmost layer (57) composed of a material selected from a group of chemical compounds comprising: oxides, carbides, nitrides, silicates and borides, wherein the protective layer system (59) either consists of the topmost layer (57) having a thickness (d) of between 5 nm and 15 nm, or the protective layer system (59) has at least one further layer (58) below the topmost layer (57), the thickness (d 2 ) of which is greater than the thickness (d 1 ) of the topmost layer (57), and wherein the topmost layer (57) has a thickness (d-i) of not more than 5 nm and a thickness (d2) of the further layer (58) or of the further layers is greater than 5 nm.
    • 本发明涉及一种用于优化用于反射光学元件(50)的多层系统(51)的EUV辐射(6)的保护层系统(59)的方法,包括以下步骤:选择最上层的材料(57 )从包括氧化物,碳化物,氮化物,硅酸盐和硼化物的一组化合物组成的保护层系统(59)中,其中选择最上层(57)的材料根据各化学品的形成焓 复合。 本发明还涉及一种光学元件(50),其包括:反射多层体系(50)的EUV辐射(6)和具有最上层(57)的保护层系统(59),所述最顶层(57)由选自组 包括:氧化物,碳化物,氮化物,硅酸盐和硼化物的化合物,其中所述保护层系统(59)由厚度(d)在5nm和15nm之间的最顶层(57)组成,或者保护层 系统(59)在最顶层(57)下方具有至少一个另外的层(58),其厚度(d2)大于最顶层(57)的厚度(d1),并且其中最顶层 57)具有不大于5nm的厚度(di),并且另外的层(58)或其它层的厚度(d2)大于5nm。