Oct 6, 2020 |
Etching Tools
Etch Rate Etch rate is the measurable quantity of how fast material is removed from the surface of a wafer and is typically expressed in Å, nm, μm per unit time (e.g. Å/s, nm/min, μm/min). It is usually measured following an etch process by dividing the total thickness change by the time of the etch or by taking several thickness measurements for different etch times and using a “best fit” to the slope. This is done when it is suspected that the etch rate may not be linear with time or that there may be a delay in the onset of etching. Occasionally, it is possible to measure the etch rate in real-time....