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LAM 9400/Processes/LNF Poly

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[[Category:Processes]] [[Category:RIE]]
LNF_Poly is designed for etching si [[Silicon|Si]] and polysilicon [[Polysilicon]] in the LAM 9400. This recipe is currently under development produces a very vertical sidewall angle and will replace poly_etch_2 as it does not have the same stability problemshas a high selectively to oxide (~18:1).
==Etch Rates==
* Polysilicon - 2340 Å/min (blanket 150mm poly)*Si - 2800 Å/min(<10% open area)
*SPR 220 (3.0) - 275 Å/min
*SiO<sub>2</sub> - 150 Å/min
==Sidewall Profile==
[[* Nearly a 90 degree sidewall angle <gallery mode="packed-hover" heights="300px">File:LAM_9400_LNF_Poly_2um_grating.jpg|400px|2µm grating in Si LNF_Poly for 600 sec]], 2 µm grating[[File:LAM_9400_LNF_Poly_10um_grating.jpg|400px| 10µm grating in Si LNF_Poly for 600 sec]], 10 µm grating</gallery>
To remove the photoresist a ~20 sec dip in 100:1 HF is necessary before nanostrip.
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