G.Villani jan. 071 CALICE pixel Deep P-Well results Nwell ≈ 900 μm 2 P-well 1μm ring gap Collecting diodes 3.6 x 3.6 μm 2 Bias: NWell 3.5V Diodes: 1.5V.

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G.Villani jan. 071 CALICE pixel Deep P-Well results Nwell ≈ 900 μm 2 P-well 1μm ring gap Collecting diodes 3.6 x 3.6 μm 2 Bias: NWell 3.5V Diodes: 1.5V 50 μm x 50 μm pixel size P-well contact ground Hit points

G.Villani jan. 072 CALICE pixel Deep P-Well results Nwell 3.6 x 3.6 μm 2 P-well 1μm ring gap Collecting diodes 3.6 x 3.6 μm 2 1 μm clearance from the guard ring Bias: NWell 3.5V Diodes: 1.5V 50 μm x 50 μm pixel size P-well contact ground Hit point P-well 5μm guard ring

G.Villani jan. 073 CALICE pixel Deep P-Well results ≈ 144 mV ≈ 202 mV ≈ 9.5 μm V μmμm μmμm top Epitaxial layer potential well Deep P Well Ring z= 31 μm)

G.Villani jan. 074 CALICE pixel Deep P-Well simulation results Single pixel results Pwell Guard ring and CNW comparison Diodes Charge collected (e - ) e-e- Guard Ring DPW Central NW 900 um2 1 6 CNW Charge collected (e - )Collection time (ns) GR: 268 (e - ) CNW: 257 (e - )

G.Villani jan. 075 ConclusionsConclusions The layout with central well size 900 μm 2 clearly shows worse performances in terms of charge collection compared to the guard ring PW: however the worst cases seem comparable, suggesting a S/N min exceeding 10 in both cases Collection time still well below 200 ns in both cases, with central NW 900 μm 2 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) CALICE pixel Deep P-Well results

G.Villani jan. 076 CALICE pixel Deep P-Well results Narrow ( 3 μm ?) P-Well guard ring around each pixel