1. Full list of devices of May09
Wafer sensor n 15 2E E E E E E E E E E
WAFER SENSOR N 11   
2E1    10142
2E17    08152
2E3     03142
2E4     04152
3E5      04141
3E7      05151
3E9      04142
3E11     05152
4E6      05082
4E8     09071
In red the ones we loaded (see next)
Wafer 11 characterized by having few pixels working randomly distributed.
Wafer15 characterized by low breakdown voltage.
Is it useful to load more, at least from wafer 15?

2. Loaded devices Device Wafer sensore IV Test Status comments 3E5 0914115
Vbd at 10V
FE does not work properly
3E7    06152
Tuned/calibrated
-> Testbeam
3E9    10132
3E11   07152
Not tuned yet
3E5      04141 11
Normal
Few pixel working
3E7      05151
3E9      04142
To be tested
to be done
None yet

3. IV curves for three devices of wafer 15. Vbd is ~10V.
Some more tests on the three devices of wafer 15 that we still have in Genova:
Repeat IV scan
Noise vs HV
Monleak scan
Xtalk (done but not understood yet)
Noise, monleak and Xtalk only for two devices as one as the FE not working.
IV curves for three devices of wafer 15.
Vbd is ~10V.

4. Wafer15: 3e11_07152
Noise vs HV
Monleak

5. 20 V
The noise becomes higher, especially when two neighbouring pixels are injected at the same time.
Increasing the voltage, the noisy area increases.
12 V
At 10V the leakage voltage starts raising, few pixels starts becoming very noisy
10 V
8 V

6. Noise distributions vs HV

7.
2D Noise map

8.
Three pixels show an higher leakage current and their noise starts increasing
(also for few neighbours)

9.
The areas of noise increase around the noisy “pixel seeds’

10. Wafer15: 3E9_10132
Noise vs HV
Monleak

11. Noise map vs HV 18 V 12 V 10 V 8 V Two areas are visible where
the noise increases
10 V
8 V
Many pixels are noisy
already at low voltages

12. Noise distributions vs HV

15. Outlook
Wafer 15 have a low breakdown voltage. This seems correlated to few pixels that start drawing more current. It does not look as a coherent effect or due to cut problem.
Debug the FE not working
Load more? Is it useful to get more evidence?
Understand better the Xtalk results (not shown)