Patent ID: 9558952
Date: 2017-01-31
CPC Classifications: C09K,H01L,Y02E,Y02P

Claim:
1. A method for etching a semiconductor substrate comprising the step of: contacting the substrate with a process medium which is provided in a process tank, wherein the substrate is transported such that it is moved in a plane which is oriented substantially in parallel direction to the surface of the process medium, and wherein the process medium comprises at least one alkaline and at least one viscosity-increasing component and has a pH value of higher than 12 and a viscosity of at least 1.5 mPas, and in that the substrate is contacted with the process medium only on one side, wherein “on one side” means that in the case of a flat substrate, such as a wafer, one of both main sides, thus the front side or the back side, is not contacted with the process medium.