Test Data of etching SiO2 with CHF3/CF4-ICP1
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| ICP#1: 0.5Pa, 50/900W, CHF3/CF4=10/30 sccm, time=210 sec | |||||
| Date | Sample# | Etch Rate (nm/min) | Etch Selectivity (SiO2/PR) | Averaged Sidewall Angle (o) | SEM Images |
| 1/28/2019 | I11901 | 110 | 1.35 | [1] | |
| 5/29/2019 | I11903 | 105 | 1.41 | [2] | |
| 1/13/2020 | I12001 | 78.0 | 1.06 | [3] | |
| 1/13 rate is low by ~20%, so chamber was wet-cleaned on 1/21/2020. Data below for 1/23 shows rate returned to "normal". | |||||
| 1/23/2020 | I12002 | 109 | 1.16 | [4] | |