Ion Beam Laboratory, Korea Institute of Geoscience and Mineral Resources, Gajeongdong 30, Yuseonggu, Daejeon 305-350, Korea
1Department of Chemistry, Daejeon University, Daejeon 300-716, Korea
Ion beam lithography was performed using 450-500 keV protons and membrane masks in order to show its good potential as a next generation lithography (NGL) tool. By both simulation and experiment using channeling mask, it is shown that a sub 100 nm pattern can be generated with practical mask-to-wafer distance (~10 um). The angular distribution of protons emerging from the channeling mask was measured to show a very narrow width, which is of vital importance for good lateral line definition. A computer simulation was performed to simulate the proton dose distribution in the resist and to optimize the mask thickness. A comprehensive procedure for fabricating a channeling mask is described. The image replication of the mask pattern at the resist by proton irradiation shows the good potential of the method as a NGL tool.
Keywords : ion beam lithography, proton beam, membrane mask, channeling mask, angular spread
Jap. J. Appl. Phys., 41(2002)4141
full paper down (pdf file)