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CALICE pixel Deep P-Well results

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

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CALICE pixel Deep P-Well results

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  1. CALICE pixel Deep P-Well results P-well contact ground Nwell ≈ 900μm2 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 G.Villani jan. 07

  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 Hit point • Bias: • NWell 3.5V • Diodes: 1.5V 50 μm x 50 μm pixel size G.Villani jan. 07

  3. ≈ 9.5 μm ≈ 202 mV ≈ 144 mV CALICE pixel Deep P-Well results Deep P Well Ring ( @ z= 31 μm) Epitaxial layer potential well μm V top μm G.Villani jan. 07

  4. 161 ns /352e- NW 55 ns/71e- NW 92 ns/31e- NW 139 ns/103e- NW CALICE pixel Deep P-Well results Single pixel results No Pwell Guard ring e- Diodes Charge collected (e- ) D tc / NW Charge collected G.Villani jan. 07

  5. 238 e- Diodes /1e- NW/ 107 ns tc CALICE pixel Deep P-Well results Single pixel results 5 μm Pwell Guard ring G.Villani jan. 07

  6. CALICE pixel Deep P-Well results • Conclusions • The layout with increased central well size shows a decrease in efficiency of charge collection: however, a S/Nmin should still exceed 10 • Collection time still well below 200 ns. • P Well Guard ring of 5 μm makes worst hit (21) lower but still acceptable with 3.6 μm central N Well • Next step: • Different size diodes simulations (7.6 / 1.8 μm) • Final layout simulation G.Villani jan. 07

  7. CALICE pixel Deep P-Well results Narrow ( 3 μm ?) P-Well guard ring around each pixel G.Villani jan. 07

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