Test Data of etching SiO2 with CHF3/CF4/O2 (using this recipe only for Fluorine etch of the underneath layer)
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ICP#2: 0.5Pa, 50/500W, CHF3/CF4/O2=35/5/10sccm, time=210 sec | |||||
Date | Sample# | Etch Rate (nm/min) | Etch Selectivity (SiO2/PR) | Averaged Sidewall Angle (o) | SEM Images |
10/5/2018 | SiO2#01 | 95.2 | 0.74 | 77.9 | |
1/28/2019 | I21902 | 92.1 | 0.77 | [1] |