If the outer area of the wafer were exposed during the e-beam lithography
operation, then the silicon and the hardmask oxide would remain before polysilicon
deposition. This would produce a relative “high” area on the outer regions of the
wafer. However, this would increase the e-beam write time to unacceptable levels.
However, in order to maintain the oxide and silicon, the exposure must be done at the
same time as the RX e-beam exposure. NEB-31 is sensitive to, in addition to electron
beam dose, Deep Ultra-Violet (DUV) dose [29]. One of the CNF contact/proximity
aligners (the HTG 3HR) utilizes a wideband light source. So, a mask was produced