Attached is the UI diagram of the new double-sided silicon strip detector (DSSD). [Micron W1, ID: 3305-11] 

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

Analysis:
The current plateau extends up to about 80V. Beyond this point the current increases more rapidly with voltage.

Conclusion:
Operation between 70-80V is optimal.
Depletion voltage is 40V according to Micron.