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Elèni BerdermannGSI, GSI, HelmholtzHelmholtz ZentrumZentrum ffüürr SchwerionenforschungSchwerionenforschung
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Contributing to these studiesContributing to these studiesContributing to these studiesUNIVERSITY OF AUGSBURGGSI - DETECTOR LABORATORY
Stefan DunstStefan GsellMatthias SchreckChristian Stehl
Mircea CiobanuMD Shahinur RahmanCarmen SimonsMichael TrägerEBe
GSI – ACCELERATOR HFPeter Moritz
GSI – TARGET LABORATORYAnnett HübnerBirgit KindlerBettina LommelWilly Hartmann
CARAT –Advanced Diamond Detectors1st CARAT workshop, DEC 2009
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OutlineOutlineOutline
Introduction
Bulk and surface structure
Electronic propertiesDark conductivity
Timing signals
Charge Collection Efficiency (CCE)
Homogeneity of the signal response
Summary and conclusions
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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IntroductionIntroductionIntroduction
Motivation Radiation hard, ultra-fast, large-area diamond tracking and ToF sensors of better homogeneity than pcCVDD
RequirementsHomogeneous, high-mobility detector material
δx, δy ≈ 3 – 100 µm ; σToF ≤ 50 ps; SPR ≈ 107 – 108 ions/s
High charge-collection efficiency (CCE)good S/N ratio for relativistic light ions and protons
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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DoI material(s) – Post processingDoIDoI material(smaterial(s) ) –– Post processingPost processingDia/IDia/Ir/r/YSZ/Si(001): (cube on cube)YSZ/Si(001): (cube on cube)
HI sensors
1) IRIDIUM ELECTRODE(growth side polished)
Contacts
Iridium substrates:4 inch wafers routinely realized
ORIGINAL STRUCTURE
DoI 549a, d = 230 µm
2) FREESTANDING(both sides polished)
Contacts
universalsamples
HVContacts
DoI 724b, d = 12 µm
3) ADDITIONALIR LAYER
ultra-thinlow-energy HI
sensorsM. Schreck et al, Uni Augsburg
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Bulk Structure⎝Birefringence imagingBulk StructureBulk Structure⎝⎝Birefringence imagingBirefringence imagingStefan Dunst, Uni Augsburg; Michael Träger, Carmen Simons, GSI (DL)
Dia-on-DiaDia-on-Iridium Dia-on-Silicon
‘quasi’single-crystal
poly-crystal single-crystal
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Surface structure ⎝ AFM imagingSurface structure Surface structure ⎝⎝ AFM imagingAFM imagingStefan Dunst, Uni Augsburg
Nucleation side
Growth side
DoIDoI 549a,549a,No add. N2,No add. N2,free standingfree standingD = 230 D = 230 µµmm
11 scaife polished
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Metallization by sputtering (Ti-Pt-Au)Metallization by sputtering (TiMetallization by sputtering (Ti--PtPt--Au)Au)
DoIDoI 724b 724b 22ndnd IrIr layer defining anlayer defining anactive thickness of 12active thickness of 12µµmm
2
4-sector electrodeon growth side
Bottom view on ‘1st’ Ir layer
B. Lommel, A. Hübner et al. GSI (TL)
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Electronic propertiesElectronic propertiesElectronic propertiesIV characteristics of the different CVDD types IV characteristics of the different CVDD types
(a) (b) (c)
Dia-on-Dia Dia-on-IridiumDia-on-Silicon
The lowest dark conductivity has been measured for Dia-on-Iridium.1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Electronic properties - dark conductivity Electronic properties Electronic properties -- dark conductivity dark conductivity Dark conductivity studiesDark conductivity studieswith DoI549a
MD Shahinur Rahman, GSI MC PAD
with DoI549a
ACTIVATION ENERGY EacACTIVATION ENERGY ACTIVATION ENERGY EEacacIV (T) IV (T) -- DEPENDENCEDEPENDENCE
M. Pomorski PhD thesis: EEacacSC≈ 0.35 – 0.39 eV: B activation
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Electronic properties – dark conductivityElectronic properties Electronic properties –– dark conductivitydark conductivity
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
CHECK OHMIC and SCL CONDUCTIONCHECK OHMIC and SCL CONDUCTION
Dark conductivity studiesDark conductivity studieswith DoI549a
MD Shahinur Rahman, GSI MC PAD
with DoI549a
α = 1 OHMICα ≥ 2 SCL
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Electronic properties – dark conductivityElectronic properties Electronic properties –– dark conductivitydark conductivity
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
MD Shahinur Rahman, GSI MC PAD
ECATJ .)ln()ln( *
2 +=b
d
kk
q
C..4 επ
=with SCHOTTKY BARRIER Φb
Dark conductivity studiesDark conductivity studieswith DoI549a with DoI549a
ΦΦbb = 1.8 = 1.8 --1.9 1.9 eVeV
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Detector setup for a-ToF measurementsDetector Detector setupsetup forfor aa--ToFToF measurementsmeasurements
conductive rubber
main pcb back side
main pcb front side
No α-collimator in this case
DoI 724b
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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241Am-α-induced transient current signals241241AmAm--αα--induced transient current signalsinduced transient current signals
Dia-on-Dia Dia-on-IridiumDia-on-Silicon
‘‘SINGLESINGLE--CARRIERCARRIER’’ DRIFT IN THE DRIFT IN THE ‘‘SMALLSMALL--SIGNALSIGNAL’’ CASECASE
The TC signals of DoI sensors show narrowest FWHM (< 500ps) and amplitudes (on 50Ω) comparable to homoepitaxial diamond.
1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Timing signal characteristics – DoI 724bTiming signal characteristics Timing signal characteristics –– DoIDoI 724b724bα-source, DBAII, and +HV on growth side
16 µ
A ≈
100
mV
on 5
0Ω(a
t D
BA g
ain
122.
5)
1V/µm20mV/div 2V/µm20mV/div
HO
LE D
RIFT
SIG
NA
LS
4V/µm40mV/div3V/µm30mV/div
t-axis: 500ps/div1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Timing signal characteristics – DoI724bTiming signal characteristics Timing signal characteristics –– DoI724bDoI724bα-source, DBAII, and - HV on growth side
16 µ
A ≈
100
mV
on 5
0Ω(a
t D
BA g
ain
122.
5)
-2V/µm40mV/div
-1V/µm30mV/div
ELEC
TRO
N D
RIFT
SIG
NA
LS
-4V/µm50mV/div-3V/µm50mV/div
t-axis: 500ps/div1st CARAT workshop, DEC_09 Early Diamond-on-Iridium (DoI) samples
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Charge collection efficiency (CCE)Charge collection efficiency (CCE)Charge collection efficiency (CCE)
3α - line source
E [V/µm]-6 -4 -2 0 2 4 6
CC
E
-1.0
-0.5
0.0
0.5
1.0
DG PC_CVDD
AG PC_CVDD incr_neg Q1
incr_neg Q2
incr_neg Q3
incr_neg Q4
decr_neg Q1
decr_neg Q2
decr_neg Q3
decr_neg Q4
incr_pos Q1decr_pos Q1incr_pos Q2
incr_pos Q3
incr_pos Q4
decr_pos Q2
decr_pos Q3
decr_pos Q4
Stopped ions STRONG POLARIZATION
DoI724b12µmDoI549a
230µm
CARAT –Advanced Diamond Detectors1st CARAT workshop, DEC 2009
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Homogeneity of the sensor responseHomogeneity of the sensor responseHomogeneity of the sensor response
DoI 724b @ -2V/µm
MEASURED α-ENERGY [keV]
0 500 1000 1500 2000 2500
CO
UN
TS
1
10
100 pulser
Q1Q2 Q3Q4
QC [fC]1.0 10.0 100.0
CO
UN
TS20
40
60
80
100
120
DoI CVDD; 230µm pcCVDD; 350µm
scCVDD; 50µm
Energy resolution (α’s): ‘Thin’ DoI δE/E ≤ 20%‘Thick’ DoI δE/E ≤ 40%
Poly CVDD δE/E >> 60%
CARAT –Advanced Diamond Detectors1st CARAT workshop, DEC 2009
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Summary and conclusionsSummary and conclusionsSummary and conclusionsVery low dark conductivity; order of 10-13A at 4V/µm
High activation energy Eac = 1.6eVSchottky conduction
CCEα ≈ 40% Extremely fast timing signals; FWHM << 500ps; rt< 200ps
no really suitable electronics available forTiming α-amplitudes as high as of best single-crystalsEnergy resolution δE/E < 20%
NEXT STEPS NEXT STEPS Signal simulations and FEE developmentsSignal simulations and FEE developmentsHeavyHeavy--ion beam tests in spring 2010ion beam tests in spring 2010Preparation of tools and assembly techniquesPreparation of tools and assembly techniquesfor largefor large--area strip sensorsarea strip sensors
1st CARAT workshop, DEC 2009 CARAT –Advanced Diamond Detectors
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MERRY CHRISTMAS and HAPPY NEW YEAR !!!MERRY CHRISTMAS and HAPPY NEW YEAR !!!
1st CARAT workshop, DEC 2009 CARAT –Advanced Diamond Detectors