Patent ID: 8685864
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A method for treating a substrate surface of flat silicon substrates with a process medium at the substrate underside, wherein the process medium has a removing or etching effect on the substrate surface and wherein the silicon substrates are transported one after the other over a tank containing the process medium, the method comprising the steps of: wetting the substrates with the process medium from below with the substrates lying horizontally; and wetting or covering the upwardly facing substrate top side with water or other protective liquid over a large area or over the whole area as protection against the process medium or the outgassings thereof acting on or reaching the substrate top side, the protective liquid being applied to the top side by at least one spray nozzle, wherein arrival of the respective substrate at a nozzle spray region and passing of the nozzle spray region by the substrate is detected, and activation of the at least one nozzle is controlled depending on this detection.