Attached is the UI diagram of the new double-sided silicon strip detector (DSSD). [Micron W1, ID: 3305-9] 
It was taken during the internship of Emily Voigt and Rebanna Klawitter.

Conditons:
- DSSD in dark test chamber
- under atmosphere pressure
- no alpha source or similar

Analysis:
The current is roughly linear with voltage up to values of about 110-120V. After this point the current increases more slowly, kind of a plateau.
The comparison to an older measurement [https://elog.gsi.de/esr/E127/292] with another, identical DSSD is not fully understood. No plateau seems to reached in the range up to 150V. The currents are also significanlty higher.

Conclusion:
Save operation is possible up to 100V. 
Voltages above 100V should only be used in case of ion damage and related performance losses.