25.2.2003Sensor meetingF. Hartmann 1 Status report St & HPK plus add. Scratch tests. IEKP –...
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- Slide 1
- 25.2.2003Sensor meetingF. Hartmann 1 Status report St & HPK
plus add. Scratch tests. IEKP University of Karlsruhe Frank
Hartmann
- Slide 2
- 25.2.2003Sensor meetingF. Hartmann 2 QTC (sensors from JAN
& FEB) Optical inspection of KA-Set 10 &11 (33/35)
Electrical results of KA-Set 10/1 W5B (8/8) KA-Set 10/2 W5B (13/13)
KA-Set 11/1 W6B(5/10) KA-Set 11/2 W6B(4/4) KA-Set H5 W1TID(3/37)
Some high IV I-t Some currents are improving with time MANY sensors
at the IV limit Possible explanation for the high IV and
discrepancy of CMS & ST measurements.
- Slide 3
- 25.2.2003Sensor meetingF. Hartmann 3 Optical inspection
KA-S10/1 Batch 31850 W5B Del. 9.1.2003 KA-S11/1 Batch 32961 W6B
9.1.2003 KA-S11/2 Batch 39728 W6B 9.1.2003 KA-S10/2 Batch 37528 W5B
(11/13) Del. 9.1.2003
- Slide 4
- 25.2.2003Sensor meetingF. Hartmann 4 2 Sensors class C
3021102318502130211023752820 IV OK! 2 rejects!
- Slide 5
- 25.2.2003Sensor meetingF. Hartmann 5 KA Set S10 (21 sensors
W5B)
- Slide 6
- 25.2.2003Sensor meetingF. Hartmann 6 KA Set S10 ----
global
- Slide 7
- 25.2.2003Sensor meetingF. Hartmann 7 KA Set S11 (9/14 sensors
W5A)
- Slide 8
- 25.2.2003Sensor meetingF. Hartmann 8 KA Set S11 ----
global
- Slide 9
- 25.2.2003Sensor meetingF. Hartmann 9 Comparison of Datas For 17
sensors no data available ! (~50% data still missing!!!!!!) Good
agreement for pinholes, shorts and Rpoly! Ileak & CaC not
measured by ST Add. defective strips have scratches! no add.
Pinholes due to scratches! Higher current @ 450V due to scratches!
QTC & ST agree on IV up to the additional ~linear~
increase!
- Slide 10
- 25.2.2003Sensor meetingF. Hartmann 10 Same IV up to soft strip
breakdown First strip Second strip
- Slide 11
- 25.2.2003Sensor meetingF. Hartmann 11 Summary of QTC
KA-S10/1KA-S10/2KA-S11/1KA-S11/2 Optical inspected 8/811/1310/104/4
measured7/812/134/103/4 Failures Opt/IV/ strips 1/0/01/0/0
1/1/01/1/0 0/0/00/0/00/0/00/0/0 Accepted %8784100
- Slide 12
- 25.2.2003Sensor meetingF. Hartmann 12 I-t @ 450V 1. 2. 10A 5 A
7 A 5 A Saturation not yet reached
- Slide 13
- 25.2.2003Sensor meetingF. Hartmann 13 I-t @ 550V Min not
reached! 12 A 8 A
- Slide 14
- 25.2.2003Sensor meetingF. Hartmann 14 I-t @ 550V over night
30211223972812
- Slide 15
- 25.2.2003Sensor meetingF. Hartmann 15 Improvements of IV e.g.
30211023752813 I-t (~10 min) between each IV-curve !
- Slide 16
- 25.2.2003Sensor meetingF. Hartmann 16 IV-problem 5 from 6
sensors improved, but they needed ~20 min or longer to reach the
specified limit! each sensor has a few high leaky strips! leaky
strips ~ IV ( few strips drive IV) EACH leaky strip is scratched !
Attention: standard test with I-t would had have jected 6 instead
of 1
- Slide 17
- 25.2.2003Sensor meetingF. Hartmann 17 Leaky strips
30211223972812 strip 49 30211223972812 strip 282
- Slide 18
- 25.2.2003Sensor meetingF. Hartmann 18 Leaky strips (2)
30211223972812 strip 282 30211223972816 strip 3
- Slide 19
- 25.2.2003Sensor meetingF. Hartmann 19 Leaky strips (3)
30211223972816 strip 14 30211223972816 strip 476 ?
- Slide 20
- 25.2.2003Sensor meetingF. Hartmann 20 Solving/Explaining the
problem!?!??? Clear correlation between IV and leaky strips and
scratches on sensors observed! No IV-breaks on Minisensors !
Handling ! Scratch test: Scratchtest on minisensors to reproduce
effect Needle Pencil (2B) screwdriver
- Slide 21
- 25.2.2003Sensor meetingF. Hartmann 21 Scratches on Minisensor
Soft scratches with probe needle Carbon residues of pencil
- Slide 22
- 25.2.2003Sensor meetingF. Hartmann 22 Deep scratches on
Minisensor Not-so-SOFT scratches with screwdriver
- Slide 23
- 25.2.2003Sensor meetingF. Hartmann 23 IV of ST-minisensor
x3
- Slide 24
- 25.2.2003Sensor meetingF. Hartmann 24 ILeak (regard strips
8-15) A few single strips show high leakage current!
- Slide 25
- 25.2.2003Sensor meetingF. Hartmann 25 Ileak ramps on scratched
strips x 70 All ramps on screwdriver scratched minisensor! The ramp
behavior is similar to the global IV!
- Slide 26
- 25.2.2003Sensor meetingF. Hartmann 26 Correlation strip current
IV Correlation strip current IV Undamaged minisensor @ 400V: Ileak
~ 0,2nA x 192 strips ~ 35nA IV ~ 38nA Damaged minisensor @ 400V:
Ileak damaged strips ~ 55nA Ileak all ~ 100nA IV ~ 120nA High IV
behavior is driven by some leaky strips !
- Slide 27
- 25.2.2003Sensor meetingF. Hartmann 27 Similar defect in CDF
sensors Defect in the p+ layer!! BUT: scratches do not effect p+ (
no pinholes!)
- Slide 28
- 25.2.2003Sensor meetingF. Hartmann 28 Idiel on scratched
Minisensor Pinholes should be here ! Effect is located in the Al
layer, above the oxide!
- Slide 29
- 25.2.2003Sensor meetingF. Hartmann 29 Summary of scratch-test
Scratches increase individual strip leakage current Some few leaky
strips drive high IV Hard mechanical force necessary to damage
sensor! ALL unscratched minisensors show GOOD IV ! ALL leaky strips
are scratched, but not all scratched strips are leaky ! Pinholes???
no pinholes produced in scratch-test no big differences between
data of ST and QTC (w.r.t. pinholes) Effect is located in the Al
layer, not the p+ layer CMS sensors have metal strip
overhang!!!!
- Slide 30
- 25.2.2003Sensor meetingF. Hartmann 30 HPK W1TID qualification
PQC fine, but quite low depletion voltages BTC OK Masks: postponed
-- should be done in Vienna, cause CMM breakdown in KA QTC: fine,
but quite low depletion voltages! Very low total leakage currents.
3/27 sensors measured (no single strip failure)
- Slide 31
- 25.2.2003Sensor meetingF. Hartmann 31 KA SET H5 (3/37
W1TID)
- Slide 32
- 25.2.2003Sensor meetingF. Hartmann 32 KA SET H5 --- global