Patent ID: 11901564
Assignee: nan
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 1:
2. The method as defined in claim 1,
wherein said applied etching pulses have a pulse duration between 0.001 seconds and 0.5 seconds, an etching current density between 0.1 mA/cm2 and 100 mA/cm2, and a total etching time of between 0.03 seconds and 450 minutes;
wherein said applied passivation pulses have a passivation current density between 0.1 mA/cm2 and 100 mA/cm2, and having a passivation pulse duration between 0.001 seconds and 10 seconds; and
wherein said fast bipolar electrochemical etching step is applied on said germanium substrate for a total porosification time between 1 minutes and 900 minutes.