1. Low temperature: measurements plan
Marco Bomben

2. Measurements goals Validate the new system by:
Reproduce “old” results taken at 0 °C on irradiated edgeless pad diodes
Reproduce “old” results taken at 0 °C on irradiated edgeless FEI4 test structures
For edgeless pad diodes and FEI4 test structures repeat then the measurements at -20 °C
Measure the CiS n-on-p irradiated diodes

3. 1. Irradiated pad diodes
A diode was irradiated with reactor neutrons (JSI, Ljubljana), ϕ = 2.5x1015 (1 MeV) neq/cm2
a) reproduce the 0 °C result; b) go to -20 °C
log(C) – log(V)
I – V
α ~ 4.7x10-17 A/cm

4. 2. Irradiated FEI4 test structures
a) reproduce the 0 °C result; b) go to -20 °C

5. 3. Measure the CiS n-on-p irradiated diodes
a) IV & CV measurement at -20 °C
IV & CV measurement at -20 °C taken at Moll’s lab
Need to go to Vbias = 3000 V to observe full depletion for the largest fluence

6. How much time will the meas. take?
CV for 1 diode: 2 seconds/bias point, points
Hence CV meas.: 1-2 hours (including mounting/unmounting) for 1 diode
1 diode for 1. a) & b)
No diodes for 2.
For 3. : we have ~ 6 diodes x 3 fluences
IV for diodes/test structures: a factor of 4 faster
Shorter time for each bias point

7. Plan Start: Thursday, 5 March Measurements days: Thursday, Friday
Break: Week of 23/3 -> DESY testbeam
Proposed plan
5-6/3: restart of the probe-station, test on chiller
12-13/3: 1. a)
19-20/3: 1. b)
2/4: 2. a)
16/4: 2. b)
9/4 -> teaching

8. Plan Start: Thursday, 5 March Measurements days: Thursday, Friday
Break: Week of 23/3 -> DESY testbeam
Proposed plan
5-6/3: restart of the probe-station, test on chiller
12-13/3: 1. a)
19-20/3: 1. b)
2/4: 2. a)
16/4: 2. b)
For CiS n-on-p: once we are confident in the new setup we can proceed with the CiS diodes
9/4 -> teaching