department of semiconductor detectors
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Thomas BergauerDepartmentof SemiconductorDetectors
HEPHY Scientific Advisory Board
21 Oct. 2010
Department of Semiconductor Detectors
2Thomas Bergauer21 Oct. 2010
Mission Statement• Design, construction and testing of silicon sensors and
detector modules
• Operate the semiconductor laboratory (a.k.a. “clean room”)
Department of Semiconductor Detectors
3Thomas Bergauer21 Oct. 2010
List of Members• Scientific (5 FTE):
– Thomas Bergauer (Belle, CMS, ILC)• AIDA WP9.4 convener
– Marko Dragicevic (CMS)• CEC convener
– Michael Hoch (CERN, CMS)
– Josef Hrubec (CMS)
– Manfred Krammer (CMS)• CMS Conference Committee Chair• Austrian RECFA representative
• Students– Two PhD students: Manfred Valentan (Belle), Stephan
Hänsel (ILC)– Three master students: Wolfgang Treberspurg, Maria
Bernard-Schwarz (CMS), Erik Huemer (CMS)
• Technicians (0.75 FTE):• Dieter Uhl (0.25 FTE, technical college)• Margit Oberegger (0.5 FTE)
Department of Semiconductor Detectors
4Thomas Bergauer21 Oct. 2010
Present Activities• Construction of the Belle II Silicon Vertex Detector (SVD)
– Double sided silicon sensors: design and negotiation with companies– Electrical characterization– Module assembly, beam tests, gamma-Irradiation
• R&D for CMS Tracker Upgrade: CEC collaboration– New sensor design: strixel sensors– New methods of connecting readout chip to sensor– Neutron irradiation at Vienna nuclear reactor– Development of radiation-hard silicon sensors with Austrian
semiconductor company
• Silicon Detectors for an International Linear Collider experiment – SiLC collaboration: Sensor Design,
electrical characterization, testbeams – Associated member of EUDET, Full member of AIDA (start 2011)
Department of Semiconductor Detectors
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Expertise: Sensor Design• Sensor design
– Design is programmed and automatically drawn
– Self-programmed software framework
• Collaboration with detector producers– Hamamatsu, Micron, ITE Warsaw
• Microscopic and spectroscopic analysis to verify actual processed sensor– Collaboration with Center for Electron
Microscopy at TU Vienna
Thomas Bergauer21 Oct. 2010
Department of Semiconductor Detectors
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Expertise: Electrical CharacterisationAvailable Setups:• Global IV, CV measurements• Fully automatic strip-by-strip
measurements performed by motorized XYZ-table
• Cold chuck to test at different temperatures
Goals are:• Quality assurance for mass
production (e.g. CMS, soon Belle II)• Report back to producer• Select good sensors for module
production
Thomas Bergauer21 Oct. 2010
Department of Semiconductor Detectors
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Expertise: Module Construction
Thomas Bergauer21 Oct. 2010
• Tasks to perform:• Gluing, metrology, wire-bonding
• Modules for• CMS Tracker mass production• Trapezoidal prototype modules
for Belle II
Department of Semiconductor Detectors
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Expertise: Beam Tests
Thomas Bergauer21 Oct. 2010
• Regular beam tests to test sensors and modules• Usually at CERNs SPS secondary
beam lines• In cooperation with HEPHY
electronics group and international colleagues (SiLC, EUDET)
• Different main goals:• 2008: resolution studies of sensors
with different layout (ILC)• 2009: performance of double metal
layers for routing purpose (CMS)• 2010: performance of double sided
sensors with different p-stop patterns (Belle II)
Department of Semiconductor Detectors
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New Expertise: Neutron-Irradiation
Thomas Bergauer21 Oct. 2010
• Irradiation of silicon sensors at TRIGA Mark II nuclear reactor at ATI Vienna (“Atominstitut der TU Wien”)• Easy access• High neutron flux
• Test of silicon sensors:• For CMS upgrade R&D• n- vs. p-type substrate• Float zone vs. mCz vs. Epitaxial material
• First in-situ temperature measurement of nuclear reactor’s irradiation channels• Necessary to know for the understanding
of the annealing behavior in silicon sensors
Department of Semiconductor Detectors
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New Expertise: Gamma-Irradiation
Thomas Bergauer21 Oct. 2010
• Irradiation of prototype Belle II modules at Co-60 source in Mol, Belgium
• Test of • Silicon sensors• readout electronics, • voltage regulators,
temp/humidity sensors
• Joint effort of semiconductor/electronics department
Department of Semiconductor Detectors
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Expertise: Analysis
Thomas Bergauer21 Oct. 2010
• Baby sensors using 3 different inter-strip isolation layout on n-side
sig nal [e]0 10 00 0 20 00 0 30 00 0 40 00 0 50 00 0 60 00 0 70 00 0 80 00 0 90 00 0
entr
ies
[]
0
20 0
40 0
60 0
80 0
10 00
Mi cron_wedge_mod1_n (M icron_wedge_1) - S ignal siC2 7Ent ries 2 03 96M ean 2 .47 5e +0 4RM S 1 .15 e+ 04
/ nd f χ 1 18 5 / 64Wid th 4 6.2± 1 85 4 M P 8 1± 1 .92 1e +0 4 Are a 1 44 201± 1 .96 7e +0 7 GSig ma 7 6.7± 4 24 1
Peak = 20882.6FWHM = 66.3%
Mi cron_wedge_mod1_n (M icron_wedge_1) - S ignal
SNR [ ]0 10 20 30 40 50 60
entr
ies
[]
0
20 0
40 0
60 0
80 0
10 00
12 00
14 00
16 00
Mi cron_wedge_mod1_n (M icron_wedge_1) - SNR snr27Entries 20396Mean 19.27RM S 9.559
clw = 1 2 3+
Peak = 21.27FWHM = 47.3%
Mi cron_wedge_mod1_n (M icron_wedge_1) - SNR
Department of Semiconductor Detectors
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Main Fields of Expertise: 2009
Thomas Bergauer21 Oct. 2010
Double metal-layer Sensor Design
Module Construction
Testbeam: 19-31. August 2009
Analysis
Electrical Characterisation
Suggestions for Improvement:
Modifications in Processing
2009: Full cycle from design to
results completed
within one year!
Department of Semiconductor Detectors
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Main Fields of Expertise: 2010
Thomas Bergauer21 Oct. 2010
New Sensor Design for Belle II
New Modules
Testbeam: 27. Sept to 11. Oct. 2010
Electrical Characterisation
2010: Full cycle from design to results completed within one year again!
Inter-strip isolation layout must be
improved
Department of Semiconductor Detectors
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Timeline of Papers, Talks and Posters
Thomas Bergauer21 Oct. 2010
2003 2004 2005 2006 2007 2008 2009 20100
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4
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Diploma/PhD theses Presentations
Papers
Department of Semiconductor Detectors
15Thomas Bergauer21 Oct. 2010
Summary
• Department of semiconductor detectors is fully integrated in research projects:– CMS Tracker construction, R&D for upgrade– Belle II: silicon sensors, modules, beam tests– Silicon Sensors for ILC
• Close collaboration with electronics department since many developments are done together (e.g. module construction)
• Good sharing of manpower:– Permanent staff carry expertise– Students for diploma/master and PhD theses
Department of Semiconductor Detectors
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Tak! Danke! Grazie! Thanks!
Thomas Bergauer21 Oct. 2010
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