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Irradiation in Karlsruhe

Irradiation in Karlsruhe. The Karlsruhe-Probestations Procedure of Irradiation Results Future annealing studies. The Probestation. Cold measurements. The Software. Procedure. Measurements of sensors @ 20°C @ rel. humidity < 30% IV & CV Ileak Rpoly (2V) CC (100Hz)

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Irradiation in Karlsruhe

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  1. Irradiation in Karlsruhe The Karlsruhe-Probestations Procedure of Irradiation Results Future annealing studies Irradiation Workshop Karlsruhe

  2. The Probestation Irradiation Workshop Karlsruhe

  3. Cold measurements Irradiation Workshop Karlsruhe

  4. The Software Irradiation Workshop Karlsruhe

  5. Procedure • Measurements of sensors • @ 20°C • @ rel. humidity < 30% • IV & CV • Ileak • Rpoly (2V) • CC (100Hz) • Pinhole (10V) • Rint (0-0,5V) >10G • Cint (1MHz) Irradiation Workshop Karlsruhe

  6. Procedure • Bias connections for irradiation (conductive rubber & bonds) • Irradiation • 34 MeV-protons • Fluence • Annealing • @ 60 °C & 80 min • Mistake: annealing of sensors in the envelopes • Same measurements as before irradiation, but • @ -10°C & dew point << -10°C (39°C) Irradiation Workshop Karlsruhe

  7. Alpha @ -10°C From literature Irradiation Workshop Karlsruhe

  8. Leakage current before and after irradiation • Guardring connected (for defined Volume) • Increase of leakage current as expected • Breakdown voltage >1200V Irradiation Workshop Karlsruhe

  9. Depletion voltage before and after irradiation • Annealed @ 60°C and 80 min • But in the envelopes ! Irradiation Workshop Karlsruhe

  10. Leakage current after Irradiation Increase of leakage current depends on fluence as aspected Low Fluence High Fluence Irradiation Workshop Karlsruhe

  11. Rpoly after irradiation 100V 0V 1V No dependence on bias conditions ! Irradiation Workshop Karlsruhe

  12. CC after Irradiation 0V 100V 1V No dependence on bias conditions ! Irradiation Workshop Karlsruhe

  13. Cint after irradiation No increase of Cint seen 1V Irradiation Workshop Karlsruhe

  14. IQC-ramps Irradiation Workshop Karlsruhe

  15. Annealing curves Irradiation Workshop Karlsruhe

  16. Annealing @ 50°C ? • Problem of annealing studies @ 60 °C • high stability of temperature needed • Effects of heating up and cooling down become important • Problem of annealing studies @ 40 °C • long time constants Irradiation Workshop Karlsruhe

  17. Time constants @ 50°C • Fit from values in the Moll-Thesis: • Beneficial annealing: 65 min • Reverse annealing: 5162 min Annealing steps: 15 min ? Irradiation Workshop Karlsruhe

  18. Conclusions • Measurements @ -10°C after irradiation • Annealing without envelopes ! • No dependence of stripvalues from bias conditions • Next irradiations without bias ? Irradiation Workshop Karlsruhe

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