| Fluorine & Chlorine based parallel plate system for etching polysilicon & nitride with endpoint detection |
| |
- Gases available: Cl2, SF6, He, O2, C2F6 |
| |
- RF power source: 650W at 13.56MHz |
| |
- Substrate size: 4” single wafer |
|
Polysilicon etch with chlorine based gas |
| |
E/R: 3500A/min Selectivity to oxide: 25:1 |
| |
Uniformity: 5% Selectivity to photoresist: 1.3:1 |
| Polysilicon etch with fluorine based gas |
| |
E/R: 4000A/min Selectivity to oxide: 20:1 |
| |
Uniformity: 8% Selectivity to photoresist: 1.5:1 |
|
Silicon Nitride etch with fluorine based gas |
| |
E/R: 1000A/min Selectivity to oxide: 3:1 |
| |
Uniformity: 8% Selectivity to photoresist: 1.3:1 |