CALICE pixel Deep P-Well results - PowerPoint PPT Presentation

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CALICE pixel Deep P-Well results

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Collection time (ns) GR: 268 (e- ) CNW: 257 (e- ) G.Villani jan. 07. 5. Conclusions ... Collection time still well below 200 ns in both cases, with central NW 900 m2 ... – PowerPoint PPT presentation

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Title: CALICE pixel Deep P-Well results


1
CALICE pixel Deep P-Well results
P-well contact ground
Nwell 900 µm2
P-well 1µm ring gap
Collecting diodes 3.6 x 3.6 µm2
Hit points
  • Bias
  • NWell 3.5V
  • Diodes 1.5V

50 µm x 50 µm pixel size
2
CALICE pixel Deep P-Well results
P-well contact ground
Nwell 3.6 x 3.6 µm2
P-well 1µm ring gap
P-well 5µm guard ring
Collecting diodes 3.6 x 3.6 µm2 1 µm clearance
from the guard ring
Hit point
  • Bias
  • NWell 3.5V
  • Diodes 1.5V

50 µm x 50 µm pixel size
3
CALICE pixel Deep P-Well results
Deep P Well Ring ( _at_ z 31 µm)
Epitaxial layer potential well
µm
V
top
µm
4
CALICE pixel Deep P-Well simulation results
Single pixel results Pwell Guard ring and CNW
comparison
CNW 257 (e- )
GR 268 (e- )
Guard Ring DPW
Central NW 900 um2
Diodes Charge collected (e- )
CNW Charge collected (e- )
Collection time (ns)
5
CALICE pixel Deep P-Well results
  • Conclusions
  • The layout with central well size 900 µm2 clearly
    shows worse performances in terms of charge
    collection compared to the guard ring PW however
    the worst cases seem comparable, suggesting a
    S/Nmin exceeding 10 in both cases
  • Collection time still well below 200 ns in both
    cases, with central NW 900 µm2 faster than the
    guard ring PW.
  • Shielding effect P Well Guard ring has to be
    assessed with reference to similar layouts no NW
    strips WERE present in the 5 µm guard ring
    layout, that might affect charge collection by
    the diodes.
  • Next step
  • Final layout simulation with and without 3 µm PW
    guard ring and proper biasing
  • Different size diodes simulations (7.6 / 1.8 µm)

6
CALICE pixel Deep P-Well results
  • Narrow ( 3 µm ?) P-Well guard ring around each
    pixel
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