23 September 2009 3D Si aperture-plates combined with programmable blanking-plates for multi-beam mask writing
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Multi-beam lithography is considered a promising fabrication technology for future node mask making. Due to rising design complexity and therefore increasing pattern writing times the multi-beam approach has distinguished throughput advantages compared to state of the art variable shaped beam pattern generators. A key component of a projection multi-beam writing tool is the programmable blanking-plate for generating the desired pattern geometry on the mask substrate. In our case a highly parallel charged particle beam illuminates a Si aperture-plate which shapes and generates many thousand individual spot beams. These beams pass through a blanking-plate with integrated CMOS electronics for demultiplexing the writing data. The blanking-plate is equipped with blanking and ground electrodes placed around the apertures switching the beams "on" or "off", dependent on the desired pattern. The beam array is demagnified by a 200x reduction optics and the exposure of the mask substrate is done in stripes by a continuous moving stage [1,2]. Cross talk between adjacent beams in the blanking-plate has to be avoided to ensure adequate pattern fidelity and line edge roughness on the mask substrate. One solution is the insertion of a 3D Si aperture-plate in proximity to the blanking- plate shielding the blanking electrodes from each other during operation. We developed and characterized a new process flow for the fabrication of these 3D Si aperture-plates for the case of 43 thousand beams in parallel and will present and discuss the cross talk results for blanking-plates combined with standard 2D and new 3D Si aperture-plates.
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Florian Letzkus, Florian Letzkus, Mathias Irmscher, Mathias Irmscher, Michael Jurisch, Michael Jurisch, Elmar Platzgummer, Elmar Platzgummer, Christof Klein, Christof Klein, Hans Loeschner, Hans Loeschner, } "3D Si aperture-plates combined with programmable blanking-plates for multi-beam mask writing", Proc. SPIE 7488, Photomask Technology 2009, 74883C (23 September 2009); doi: 10.1117/12.829630; https://doi.org/10.1117/12.829630

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