Comment svgdev SNF 2010-11-16 17:31:31: SPR955 1um - incompletely developed

jcdoll at snf.stanford.edu jcdoll at snf.stanford.edu
Tue Nov 16 17:31:31 PST 2010


about 3 weeks ago i coated 1um of SPR955 on aluminum, exposed on ASML (110 mJ/cm^2) and developed using the standard svgdev recipe (w/ double-checked settings). the results looked good.
today for the same conditions there was a bit of residual photoresist around the outer 20mm of the wafer. it was 'speckly' and mainly concentrated around topographical features. running the developer rinse another time removed it and the rest of the features still looked good. the 'ring' pattern was visible just by eye, and the center of the wafer looked good w/o a second rinse.
just a heads up for other 1um 955 users.




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