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RD50 workshop Freiburg Katharina Kaska 1
RD50
Determination of depletion voltage from CV, IV and CCE measurements on Pad Detectors
Katharina Kaska, Michael Moll
CERN-PH
RD50 workshop Freiburg Katharina Kaska 2
RD50 Introduction
Various methods to determine the depletion voltage
• Standard CV• IV• CCE vs. voltage:
- from TCT with laser
- with source (not via scope): β-source
Do they agree?
RD50 workshop Freiburg Katharina Kaska 3
RD50 Material
MCz– HIP-MCz-01-n 0.5 x 0.5 cm2 Vfd ~320V (ρ ~ 1 kΩcm) n-type
– 8556-3 (CiS) 0.5 x 0.5 cm2 Vfd ~100V (ρ ~ 2.9 kΩcm) n-type
– HIP-003-C 0.25 x 0.25 cm2 Vfd ~300V (ρ ~ 1 kΩcm) n-type
– p069/8 0.5 x 0.5 cm2 Vfd ~115V (ρ ~ 7.4 kΩcm) p-type
Epitaxial (150 µm)– HIP-004-C 0.25 x 0.25 cm2 Vfd ~150V (ρ ~ 500 Ωcm) n-type
– CNM-11 0.5 x 0.5 cm2 Vfd ~155V (ρ ~ 500 Ωcm) n-type
– CNM-22 0.5 x 0.5 cm2 Vfd ~210V (ρ ~ 980 Ωcm) p-type
Float Zone– CNM-03 0.5 x 0.5 cm2 Vfd ~20V (ρ ~ 15 kΩcm) n-type
– HIP-002-C 0.25 x 0.25 cm2 Vfd ~20V (ρ ~ 15 Ωcm) n-type
– CNM-20 0.5 x 0.5 cm2 Vfd ~2V (ρ ~ 470 kΩcm) p-type
RD50 workshop Freiburg Katharina Kaska 4
RD50 Material II
0.0 3.0x1014 6.0x1014 9.0x1014 1.2x1015 1.5x10150
100
200
300
400
500
600
dep
leti
on
vo
tag
e [V
]
proton fluence [cm-2]
HIP-003 (2.5 x 2.5 mm2)
HIP-001 (5 x 5 mm2)
depletion voltage from CV
For a part of the CCE measurements diodes of smaller size were used.No differences were observed in comparing results obtained on small (2.5x2.5) and big (5x5mm2) diodes (except for the noise levels in CCE).
Example:
MCz-n
RD50 workshop Freiburg Katharina Kaska 5
RD50 Experimental procedure
• Irradiation– 24 GeV/c protons at CERN at 27C– 1 MeV neutrons in Ljubljana
• Annealing– 4 minutes at 80C
• CV/IV– Measured at room temperature in parallel mode at 10kHz
• CCE– NIKHEF setup
• TCT– IR laser
RD50 workshop Freiburg Katharina Kaska 6
RD50 TCT setup
• all detectors were measured at -5±0.1C• humidity in the box was around 15%
- voltage applied with Cu/Be needle - floating guard ring!!!
- N2 atmosphere- Peltier cooling
- 660nm red laser - 1060nm IR laser
RD50 workshop Freiburg Katharina Kaska 7
RD50 CCE setup
P Mscin tilla to r
d iode
co llim ator
90S r sou rce
NIKHEF setup by Fred Hartjes
signal shaping time: 2.5 µs
guard ring connected to ground
• all detectors were measured at -20±1C• humidity in the box was 18-30%
• gain of 247 e-/mV for these conditions
RD50 workshop Freiburg Katharina Kaska 8
RD50 IR laser vs. beta
0 50 100 150 200 250 300
0
20
40
60
80
arb
itra
ry u
nit
s
bias voltage [V]
CCE TCT IR
CNM-03-F-43 1.66 x 1014 p/cm2
0 100 200 300 400 500 600
0
10
20
30
40
50
60
70
80
90
100
arb
itra
ry u
nit
s
bias voltage [V]
CCE TCT IR
HIP-003-C55 4.43 x 1014 p/cm2
BUT: only very few samples investigated!
Fz-nMCz-n
IR laser goes through sample (red laser only on surface) => similar to β particles
!!! Only for curve shape comparison, not CCE values!!!
RD50 workshop Freiburg Katharina Kaska 9
RD50 Fz n-type
0 1x1014 2x1014 3x1014 4x1014 5x1014 6x10140
50
100
150
200
250
300
350
400
de
ple
tio
n v
olt
ag
e [V
]
proton fluence [cm2]
CV IV CCE
CNM-03 (Fz n-type)
IV < CV < CCE (β)
100 200 300 400 500 600 70020
30
40
50
60
70
80
arb
itra
ry u
nit
s
bias voltage [V]
1/C CCE
CNM-03-F-56 4.43 x 1014 p/cm2
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 10
RD50 Fz n-type
1 MeV neutron irradiated
0 1x1014 2x1014 3x1014
0
100
200
300
400
500
600
CV IV CCE
dep
leti
on
vo
ltag
e [V
]
neutron fluence [cm-2]
CNM-03 Fz-n neutron irradiated
IV < CV < CCE (β) =>same as proton
100 200 300 400 500 600 70010
20
30
40
5060708090
100
arb
itra
ry u
nit
s
bias voltage [V]
1/C CCE
CNM-03-F-91 3x1014 n/cm2
RD50 workshop Freiburg Katharina Kaska 11
RD50 Fz p-type
0 1x1014 2x1014 3x1014 4x1014 5x1014
0
50
100
150
200
250
300
dep
leti
on
vo
ltag
e [V
]
proton fluence[cm-2]
CV IV CCE
CNM-20-F Fz-p
10 100
20
40
60
80
arb
itra
ry u
nit
s
voltage [V]
1/C I CCE
CNM-20-F-57 4.43 x 1014 p/cm2
1013 101410-6
10-5
10-4
I at d
eple
tion
[A]
proton fluence [cm-2]
CNM-03-F Fz-p
Not linear at high fluences
IV < CV < CCE (β)
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 12
RD50 MCz n-type
0.0 2.0x1014 4.0x1014 6.0x1014 8.0x1014 1.0x10150
50
100
150
200
250
300
CV IV CCEd
eple
tio
n v
olt
age
[V])
proton fluence [cm-2]
HIP-003 (MCz n-type)
IV < CCE (beta) < CV => different from Fz
24 GeV/c proton irradiated
100 200 300 400 500
20
40
60
80
arb
itra
ry u
nit
s
bias voltage [V]
CCE 1/C
HIP-003-C33 8.21 x 1014 p/cm2
RD50 workshop Freiburg Katharina Kaska 13
RD50 MCz p-type
50 100 150 200 250 300 35040010
20
30
40
50
60
70
arb
itra
ry u
nit
s
bias voltage [V]
CV CCE
p069-44 5.42 x 1014 p/cm2
0.0 2.0x1014 4.0x1014 6.0x1014 8.0x1014 1.0x10150
50
100
150
200
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm-2]
CV IV CCE
p-069 (MCz p-type)
IV < CCE (beta) = CV
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 14
RD50 EPI n-type
0.0 2.0x1014 4.0x1014 6.0x1014 8.0x1014 1.0x10150
50
100
150
200
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm-2]
CV IV CCE
HIP-004-C (EPI n-type)
50 100 150 200 250 30010
15
20
25
30
35
40
1/C CCE
arb
itra
ry u
nit
s [V
]
voltage [V]
HIP-004-C21 8.21 x 1014 p/cm2
IV < CCE (β) < CV => same as MCz
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 15
RD50 EPI n-type
0.0 3.0x1014 6.0x1014 9.0x1014 1.2x10150
50
100
150
200
250
dep
leti
on
vo
ltag
e [V
]
neutron fluence [cm-2]
CV IV CCE
HIP-004-C (EPI-n) neutron
IV < CV < CCE (β) => different from proton irrad.
1 MeV neutron irradiated
100 200 300 400 500
HIP-004-C05 (n-type) 1x1015 n/cm2
arb
itra
ry u
nit
sbias voltage [V]
CCE 1/C (normalised over Vd) I (normalised over Vd)
RD50 workshop Freiburg Katharina Kaska 16
RD50 EPI p-type
0.0 2.0x1014 4.0x1014 6.0x1014 8.0x1014
0
50
100
150
200
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm-2]
CV IV CCE
CNM-22-E (EPI p-type)
10 100
20
40
60
80
100
arb
itra
ry u
nit
s
bias voltage [V]
1/C CCE
CNM-22-E-15 4.43 x 1014 p/cm2
IV < CV < CCE (β)
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 17
RD50 EPI p-type
IV < CV < CCE (β)
100 100010
15
20
25
30
35
40
CNM-22-E-26 1x 1015 n/cm2
arb
itra
ry u
nit
s
bias voltage [V]
1/C CCE
1 MeV neutron irradiated
RD50 workshop Freiburg Katharina Kaska 18
RD50 Overview
material Irradiation Highest values Junction
Fz-n proton CCE back
Fz-n neutron CCE back
Fz-p proton CCE front
MCz-n proton CV ?
MCz-p proton CV=CCE ?
EPI-n proton CV front
EPI-n neutron CCE back
EPI-p proton CCE back
EPI-p neutron CCE front
There seems to be no correlation with:• material• n- or p-type• side of junction
RD50 workshop Freiburg Katharina Kaska 19
RD50 Summery and outlook
Summery• Depletion voltages from CV, IV and CCE were investigated for Fz, MCz and EPI
material.• All methods on their own show expected behaviour, but don’t agree in values.• No clear correlations with inversion, material and type.
Outlook:• Look at rest of methods
• Investigate after annealing (change in curve shape)
Thanks!
RD50 workshop Freiburg Katharina Kaska 20
RD50
• spares
RD50 workshop Freiburg Katharina Kaska 21
RD50 Fz n-type
0.0 2.0x1014 4.0x1014 6.0x1014 8.0x10140
100
200
300
400
500
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm2]
CV red laser
CNM-03 Fz-n
100 200 300 400 50010
20
30
40
50
60
7080
arb
itra
ry u
nit
s
bias voltage [V]
1/C red laser (front)
CNM-03-F-56 4.43e14p
0 1x1014 2x1014 3x1014 4x1014 5x10140
50
100
150
200
250
300
350
400
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm2]
CV red laser TCT
(front=electron signal) CCE
CNM-03 Fz-n
24 GeV/c proton irradiated
CV < red laser = CCE (β)
TCT with red laser from the front:electron signal in n-type
RD50 workshop Freiburg Katharina Kaska 22
RD50 MCz n-type
100 1000
0.2
0.4
0.6
0.8
1
arb
itrar
y un
its
voltage [V]
CV red laser TCT
HIP-MCz-01-n-23 9.7 x 1014 p/cm2
0.0 3.0x1014 6.0x1014 9.0x1014 1.2x1015 1.5x1015100
200
300
400
500
600
dep
leti
on
vo
ltag
e [V
]
proton fluence [cm-2]
CV red laser TCT
front=electron signal CCE
HIP-MCz-01 MCz-n
24 GeV/c proton irradiated
red laser = CCE (β) < CV
TCT with red laser from the front:electron signal in n-type
RD50 workshop Freiburg Katharina Kaska 23
RD50 MCz p-type
100
20
40
60
80
arb
itra
ry u
nit
s
bias voltage [V]
p069-44 MCz-p 5.42 x 14 p/cm2
0.0 3.0x1014 6.0x1014 9.0x1014 1.2x1015 1.5x10150
100
200
300
400
500
Vfd
[V
]
proton fluence [cm-2]
CV red laser TCT
(back = electron signal) CCE
Depletion voltage comparison MCz-p
red laser < CCE (β) = CV
TCT with red laser from the back:electron signal in p-type
24 GeV/c proton irradiated
RD50 workshop Freiburg Katharina Kaska 24
RD50 Front vs. back
HIP-MCz-01-n-261.08x1014 neq cm-2
proton
Junction is on front.
0 100 200 300 400 500 600-10
0
10
20
30
40
50
60
70
80
90
100
CC
E D
AQ
bias voltage [V]
TCT red front TCT red back TCT IR
HIP-003-C53 1.66e14 p
Front signal: electronsBack signal: holes
RD50 workshop Freiburg Katharina Kaska 25
RD50 Back vs. front
p069-443.35x1014 neq cm-2
proton
front (holes) back (electrons)
0 100 200 300 400 500
0
10
20
30
40
50
60
70
80
CC
E D
AQ
bias voltage [V]
TCT red front TCT red back TCT IR
p069-44 5.42e14 p
Front signal: holesBack signal: electrons
MCz-p
RD50 workshop Freiburg Katharina Kaska 26
RD50 Protons vs. neutrons
0 50 100 150 200 250 300
0
10
20
30
40
50
60
70
80
90
100
CNM-11-E-91 (1 x 1015 n/cm2)
arb
itra
try
un
its
bias voltage [V]
normalised curves TCT red TCT IR
0 50 100 150 200 250 300
0
10
20
30
40
50
60
70
80
90
100
CNM-22-E-25 3 x 1014 n/cm2
arb
itra
try
un
its
bias voltage [V]
normalised curves TCT red TCT IR
0 50 100 150 200 250 300
0
10
20
30
40
50
60
70
80
90
100
CC
E D
AQ
bias voltage [V]
normalised curves TCT red TCT IR
CNM-22-E-15 4.43 x 1014 p/cm2
0 50 100 150 200 2500
10
20
30
40
CC
E D
AQ
bias voltage [V]
TCT red TCT IR
HIP-004-C26 4.43e14 p
p-in-n diode (inverted)
Not invertedn-in-p diode (not inverted)
inverted
proton neutronHigh fluences