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Role of electron and ion irradiation in a reliable lift-off process with e-beam evaporation and a bilayer PMMA resist system
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This paper addresses issues related to cracking and blisters in deposited films encountered in a lift-off process with electron beam evaporation and a bilayer PMMA resist system. The impact of charged particles, i.e. electrons and ions, is investigated using an electron beam evaporation chamber equipped with ring-magnets and a plate electrode placed in front of the sample. By replacing the plate electrode with a hollow cylinder, the modified evaporation setup utilizing passive components allows a complete elimination of resist shrinkage and blistering yielding near perfect deposition results for a large variety of different materials.
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