Film quantum yields of EUV& ultra-high PAG photoresists
2008
Base titration methods are used to determine C-parameters for three industrial EUV photoresist platforms (EUV-
2D, MET-2D, XP5496) and twenty academic EUV photoresist platforms. X-ray reflectometry is used to measure the
density of these resists, and leads to the determination of absorbance and film quantum yields (FQY). Ultrahigh levels
of PAG show divergent mechanisms for production of photoacids beyond PAG concentrations of 0.35 moles/liter. The
FQY of sulfonium PAGs level off, whereas resists prepared with iodonium PAG show FQYs that increase beyond PAG
concentrations of 0.35 moles/liter, reaching record highs of 8-13 acids generated/EUV photons absorbed.
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