22 March 2008 Controlled deposition of NIST-traceable nanoparticles as additional size standards for photomask applications
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Abstract
Particle standard is important and widely used for calibration of inspection tools and process characterization and benchmarking. We have developed a method for generating and classifying monodisperse particles of different materials with a high degree of control. The airborne particles are first generated by an electrospray. Then a tandem Differential Mobility Analyzer (TDMA) system is used to obtain monodisperse particles with NIST-traceable sizes. We have also developed a clean and well-controlled method to deposit airborne particles on mask blanks or wafers. This method utilizes electrostatic approach to deposit particles evenly in a desired spot. Both the number of particles and the spot size are well controlled. We have used our system to deposit PSL, silica and gold particles ranging from 30 nm to 125 nm on 193nm and EUV mask blanks. We report the experimental results of using these particles as calibration standards and discuss the dependency of sensitivity on the types of particles and substrate surfaces.
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Jing Wang, Jing Wang, David Y. H. Pui, David Y. H. Pui, Chaolong Qi, Chaolong Qi, Se-Jin Yook, Se-Jin Yook, Heinz Fissan, Heinz Fissan, Erdem Ultanir, Erdem Ultanir, Ted Liang, Ted Liang, } "Controlled deposition of NIST-traceable nanoparticles as additional size standards for photomask applications", Proc. SPIE 6922, Metrology, Inspection, and Process Control for Microlithography XXII, 69220G (22 March 2008); doi: 10.1117/12.756741; https://doi.org/10.1117/12.756741
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