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22 March 2010 Electrostatic chucking of EUVL masks: coefficients of friction
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In extreme ultraviolet lithography (EUVL), the mask hangs on an electrostatic chuck and is moved laterally during exposition. For proper control of the chucked mask under corresponding inertial forces, static friction of the mask on the chuck is critical and an important input parameter for reliable theoretical modelling. To determine static and dynamic friction values, measurements were performed in vacuum on a mask blank with a test chuck, smaller than a real EUVL mask chuck, but otherwise nearly identical in its characteristics. Experimental results were obtained at various voltages for a materials combination of Low Thermal Expansion Glass (LTEM) for the pin chuck surface and a mask blank with a chromium metal backside metallisation, respectively. Dynamic friction was found to be only marginally smaller than static friction and values in the range from 0.27 to 0.33 were determined for the static friction coefficient under vacuum conditions.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerhard Kalkowski, Christian Semmler, Stefan Risse, Thomas Peschel, Christoph Damm, Sandra Müller, and René Bauer "Electrostatic chucking of EUVL masks: coefficients of friction", Proc. SPIE 7636, Extreme Ultraviolet (EUV) Lithography, 76362J (22 March 2010);


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