Passivation of HPGe Detectors at LNL-INFN Speaker: Gianluigi Maggioni Materials & Detectors...
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Transcript of Passivation of HPGe Detectors at LNL-INFN Speaker: Gianluigi Maggioni Materials & Detectors...
Passivation of HPGe Detectors at LNL-INFN
Speaker: Gianluigi MaggioniMaterials & Detectors Laboratory (LNL-INFN)
Scientific Manager: Prof. Gianantonio Della Mea
Staff2 Ph.D. in Materials Engineering1 Ph.D. in Chemistry1 Degree in Materials Science3 Engineers (in Electronics and Materials Science)1 Technician3 Ph.D. Students in Physics, Materials Science and Engineering
The activities of the Lab are devoted to the:1. Synthesis of new materials (thin and thick films)2. Modification of materials3. Characterization of the physical / chemical properties of materials
The research activities are mainly funded by INFN (about 3 experiments per year starting from nineties in the framework of V INFN Commitee) by inter-University MIUR research programs, by other National and International Research Institutions.
1. Synthesis of MaterialsPVD Facilities
6 Sputtering deposition apparatuses
2 High Vacuum Evaporation chambers
1 Glow-Discharge-induced Sublimation apparatus
Chemical Techniques
Spin Coating
Sol-Gel
Tape Casting
Solvent Casting
Liquid Phase Deposition
3. Characterization of the physical / chemical properties of materials
Composition (Nuclear Techniques: RBS, ERDA, NRA, IBIL, PIXE)
Morphology (AFM, SEM)
Electrical Properties (resistivity, surface resistance, dielectric breakdown field)
Mechanical Properties (Micro Scratch Test, Nano Indentation, Micro Indentation)
Chemical Structure (FT-IR Analysis)
Optical Properties (UV-visible spectrophotometry)
Previous experience in Germanium Detectors Technology
Collaboration project with EG&G Ortec “Advanced passivating techniques for the development of ruggedized HPGe detectors” (1997-1999)
Aim: an alternative to the detector encapsulation procedure (complex, expensive,...)
Passivation techniques:• deposition of oxides layers by liquid phase deposition (LPD)
These techniques were not adopted because they could not be easily applied to industrial production (according to EG&G Ortec)
New passivation technique:
Vacuum Deposition of a Polymer Layer
Polymer Deposition Apparatus
New passivation technique:
Vacuum Deposition of a Polymer Layer
Polymer Deposition Apparatus
New passivation technique:
Vacuum Deposition of a Polymer Layer
HPGe Detector
New passivation technique:
Vacuum Deposition of a Polymer Layer
• Vacuum Deposition Process (no solvent)
• Room Temperature Deposition Process
• Post-deposition curing is not required
• Very clean deposition process (compatibility with clean room operations)
• Detectors with complex shape can be coated
• Very low permeability to moisture, oxygen, … (barrier properties)
• Electrically insulating material ( > 1016 Ohm cm)
• High thermal resistance (Tg 250-400°C)
• The coated detector can be handled
• Layer thickness: 1 to 50 m
• Radiation hardness