Patent ID: 9708182
Date: 2017-07-18
CPC Classifications: B81B,B81C,H01L

Claim:
1. A method for producing at least one cavity within a semiconductor substrate, the method comprising: dry etching the semiconductor substrate from a surface of the semiconductor substrate at at least one intended cavity location in order to obtain at least one provisional cavity; depositing a protective material with regard to a subsequent wet-etching process at the surface of the semiconductor substrate and at cavity surfaces of the at least one provisional cavity; removing the protective material at least at a section of a bottom of the at least one provisional cavity in order to expose the semiconductor substrate; and electrochemically etching the semiconductor substrate at the exposed section of the bottom of the at least one provisional cavity, wherein the electrochemical etching comprises a first temporal segment, during which an electrical voltage applied to the semiconductor substrate is increased, and a second temporal segment, during which the electrical voltage applied to the semiconductor substrate is kept constant.