06-06-2019 дата публикации
Номер: US20190171108A1
Автор:
AMENT Irene,
BECKER Moritz,
EHM Dirk Heinrich,
EVA Eric,
JALICS Christof,
Kierey Holger,
Meier Robert,
SCHMIDT Stefan-Wolfgang,
Shklover Vitaliy,
URICH Diana,
Wiesner Stefan,
Winter Ralf
Принадлежит:
In order to prevent delamination of a reflective coating from the substrate under the influence of reactive hydrogen, a reflective optical element () for EUV lithography is provided, which has a substrate () and a reflective coating () for reflecting radiation in the wavelength range of 5 nm to 20 nm. A functional layer () is arranged between the reflective coating () and the substrate (). With the functional layer, the concentration of hydrogen in atom % at the side of the substrate facing the reflective coating is reduced by at least a factor of 2. 1. A reflective optical element for extreme ultraviolet (EUV) lithography , comprising:a substrate and a reflective coating configured to reflect radiation in a wavelength range of 5 nm to 20 nm,a functional layer arranged between the reflective coating and the substrate, wherein the functional layer reduces a concentration of hydrogen in atom % at a side of the substrate facing the reflective coating by at least a factor of 2, anda microstructured layer arranged between the reflective coating and the substrate.2. The reflective optical element as claimed in claim 1 , wherein the functional layer comprises at least one of: tin claim 1 , silver claim 1 , molybdenum claim 1 , ruthenium claim 1 , iridium claim 1 , nickel claim 1 , iron claim 1 , cobalt claim 1 , copper claim 1 , aluminum claim 1 , platinum claim 1 , zinc claim 1 , manganese claim 1 , lead claim 1 , gold claim 1 , palladium claim 1 , tungsten claim 1 , tantalum claim 1 , alloys claim 1 , oxides claim 1 , borides claim 1 , and nitrides or carbides thereof.3. The reflective optical element as claimed in claim 1 , wherein the microstructured layer comprises at least one of: nickel-phosphorus claim 1 , nickel-boron claim 1 , copper claim 1 , silver claim 1 , gold claim 1 , platinum claim 1 , iridium claim 1 , tantalum claim 1 , titanium claim 1 , zirconium claim 1 , tungsten claim 1 , molybdenum and niobium.4. The reflective optical element as claimed in claim ...
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