temperature dependence of sensor leakage current contents introduction measurement result summary...
TRANSCRIPT
Temperature dependence of sensor leakage current
Contents
•Introduction
•Measurement
•Result
•Summary
Junkichi Asai (RIKEN BNL Research Center)
(Hiroki kanoh (Tokyo Institute of Technology))
VTX Meeting 6/1/2004
Introduction
Tk
EATTI
B
g
2exp)( 2
::::
B
g
kEAT Temperature
sensor constant Energy gap =1.2 boltzmann constant
VI
::::
V
I Increase dark current damage constant [A/cm] sensor Volume [cm3] radiation flux [/cm2]
• Silicon breaks by Radiation damage:
dark current increases
• Main part of dark current is leakage current depending on temperature:
Setup
• Silicon strip sensor : 1st prototype detector
(2002 Nov : Test beam at KEK)
Currents
Voltage
Thickness: 400um
Channel: 384x384 (sum : 768 strips)
Front
Back
SensorAmmeter Voltage
Setup• device :
Senso
r
•Model 6487 Picoammeter/Voltage Source(Keithley Instruments) Voltage : as high as 500V Currents : as low as 20fA
•DAQ controlled by LabVIEW7 (programming by H. Kanoh)PC : Windows Connect : PCI-GPIB
•Temperature and Humidity controlled chamber(ESPEC LHU-113) T: -20 to 85oC (%RH : 0 to 95%)
Curren
ts
Voltag
e
PC
Front Back
Chamber
Ammeter Voltage
ChamberPCSensor Box
Measuring condition
•Sensor : In the chamber dark room keeping over 1day(for light sensitive)
•IV measurement : bulk=768 strips (not channel by channel)Bias Voltage : 0 ~ 500VCurrent : max 2mATemperature : -10 ~ 30 oCHumidity : 15% , 30%
Result (temperature dependence)
1.E- 10
1.E- 09
1.E- 08
1.E- 07
1.E- 06
1.E- 05
1.E- 04
1.E- 03
1.E- 02
1 10 100 1000
30℃25℃20℃15℃10℃5℃0℃-5℃-10℃
Bias Voltage [V]
Lea
kage
cur
rent
[A
]
Humidity : 30%
1.0E- 10
1.0E- 09
1.0E- 08
1.0E- 07
1.0E- 06
1.0E- 05
1.0E- 04
1.0E- 03
1.0E- 02
260 270 280 290 300
500V400V320V250V200V160V100V50V25V1V
Result (temperature dependence)L
eaka
ge c
urre
nt [
A]
[k]
Temperature
Bias Voltage
Humidity : 30%
-10 -5 0 5 10 15 20 25 30 [oC]
100Vconstant
Test beam @KEK : 80~90 V
@100V
T[oC]
I[uA]
30 70
25 51
20 32
15 20
10 15
5 10
0 8
-5 9
-10 9
Result (humidity dependence)
Bias Voltage [V]
[A]
1.0E-09
1.0E-08
1.0E-07
1.0E-06
1.0E-05
1.0E-04
1.0E-03
0 50 100 150 200
20℃ 30%20℃ 15%10℃ 30%10℃ 15%L
eaka
ge c
urre
nt
[A]