A Tegal 700 plasma etcher was used to etch trenches in (100) p-type silicon wafers using a SF6102 plasma. Silicon etch rates of approximately 1.17 microns/minute and a Si:Si02 selectivity ratio of 22.0 were obtained. Scanning Electron Micrographs show the etch was isotropic in nature with an aspect ratio of approximately 2:1.
Waskiewicz, Christopher J.
"Preliminary Formation of Deep Trench Capacitors,"
Journal of the Microelectronic Engineering Conference: Vol. 4
, Article 38.
Available at: https://scholarworks.rit.edu/ritamec/vol4/iss1/38