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Pixel Sensors for the CMS Experiment

Pixel Sensors for the CMS Experiment. Purdue University. Amitava Roy Carsten Rott Daniela Bortoletto Gino Bolla. Wafers. 3 non-oxygenated wafers from CSEM 2 non-oxygenated and 1 oxygenated wafer from Sintef. Breakdown Voltage. CSEM. Design Optimization.

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Pixel Sensors for the CMS Experiment

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  1. Pixel Sensors for the CMS Experiment Purdue University Amitava Roy Carsten Rott Daniela Bortoletto Gino Bolla

  2. Wafers • 3 non-oxygenated wafers from CSEM • 2 non-oxygenated and 1 oxygenated wafer from Sintef

  3. Breakdown Voltage CSEM

  4. Design Optimization • Pixels with metal on top have higher breakdown voltage. • 3 best designs - design A, F & G G A F

  5. Leakage Current • CSEM - 50-100 nA/cm2 • SINTEF - 5-25 nA/cm2

  6. Oxygenated Wafer • Too sensitive to Humidity!

  7. Inter-pixel Resistance • Around 100 KOhm before depletion! • Around 1 TOhm after depletion ! N+ P+ V A A R=V/I Variable V Constant V

  8. Inter-Pixel Resistance Open Double Ring

  9. Inter-Pixel Resistance Single Ring has lower resistance as expected Open Single Ring Open Double Ring

  10. Inter-pixel Capacitance N+ P+  C Inter-pixel Capacitance 100fF

  11. Conclusion • Leakage Current  100nA/cm2 • Best Designs - Design A, F & G with metal on top. • Need more wafers to get statistics about Oxygenated wafer. • Inter-pixel resistance - 100 KOhm before depletion, 0.1-1 Tohm after depletion. • Inter-pixel Capacitance - 100fF

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