18 March 2016 Enabling laboratory EUV research with a compact exposure tool
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Abstract
In this work we present the capabilities of the designed and realized extreme ultraviolet laboratory exposure tool (EUVLET) which has been developed at the RWTH-Aachen, Chair for the Technology of Optical Systems (TOS), in cooperation with the Fraunhofer Institute for Laser Technology (ILT) and Bruker ASC GmbH. Main purpose of this laboratory setup is the direct application in research facilities and companies with small batch production, where the fabrication of high resolution periodic arrays over large areas is required. The setup can also be utilized for resist characterization and evaluation of its pre- and post-exposure processing. The tool utilizes a partially coherent discharge produced plasma (DPP) source and minimizes the number of other critical components to a transmission grating, the photoresist coated wafer and the positioning system for wafer and grating and utilizes the Talbot lithography approach. To identify the limits of this approach first each component is analyzed and optimized separately and relations between these components are identified. The EUV source has been optimized to achieve the best values for spatial and temporal coherence. Phase-shifting and amplitude transmission gratings have been fabricated and exposed. Several commercially available electron beam resists and one EUV resist have been characterized by open frame exposures to determine their contrast under EUV radiation. Cold development procedure has been performed to further increase the resist contrast. By analyzing the exposure results it can be demonstrated that only a 1:1 copy of the mask structure can be fully resolved by the utilization of amplitude masks. The utilized phase-shift masks offer higher 1st order diffraction efficiency and allow a demagnification of the mask structure in the achromatic Talbot plane.
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Sascha Brose, Sascha Brose, Serhiy Danylyuk, Serhiy Danylyuk, Jenny Tempeler, Jenny Tempeler, Hyun-su Kim, Hyun-su Kim, Peter Loosen, Peter Loosen, Larissa Juschkin, Larissa Juschkin, } "Enabling laboratory EUV research with a compact exposure tool", Proc. SPIE 9776, Extreme Ultraviolet (EUV) Lithography VII, 97760R (18 March 2016); doi: 10.1117/12.2219164; https://doi.org/10.1117/12.2219164
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