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Analytical approach for 3D detectors engineering

Analytical approach for 3D detectors engineering. Vladimir Eremin , Elena Verbitskaya Ioffe Physico -Technical Institute of Russian Academy of Sciences St. Petersburg Russia. RD50 13-th meeting, CERN, 10-12 November, 2008. Outline. Typical constructions of 3D detectors

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Analytical approach for 3D detectors engineering

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  1. Analytical approach for 3D detectors engineering Vladimir Eremin, Elena Verbitskaya Ioffe Physico -Technical Institute of Russian Academy of Sciences St. Petersburg Russia RD50 13-th meeting, CERN, 10-12 November, 2008

  2. Outline • Typical constructions of 3D detectors • Electric field in 3D detectors • Radiation effects in 3D detectors • Conclusions RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  3. J/O-Osurf J-Osurf J/O-J/O J/O-SiO2 J-O/Osurf Typical 3D detector constructions Junction column (J) Ohmick column (O) Front side Back side RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  4. The Large Scale Model and operational parameters The depleted radius (Rd) Sensitive volume (S) The pinch-off voltage (Vpf) The maximum operational voltage (Vm) Cylindrical p+-n junction Spherical p+-n junction RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  5. r0 Rd The critical regions of 3D detectors Cylindrical Spherical RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  6. r0 Rd Rd r0 The main equations RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  7. Rd r0 The electric field distribution around the column Neff=1012cm-3 r0=5u Rd=50u RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  8. The pinch-off voltage MCZ: 1k cm Neff=4x1012cm-3 r0=5u Rpf=50u r0 Rpf RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  9. The full depletion voltage MCZ: 1k cm Neff=4x1012cm-3 r0=5u Pitch=a=40u Vpf Vfd r0 Rpf RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  10. The maximal electric field and pinch- off voltage increase with fluence Cylindrical part MCZ: 1k cm r0=5u Rpf=50u β=1.7e-2 Neff=βxF RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  11. Rd r0 Effect of 2D and 3D focusing on the breakdown voltage E 2D, 3D 1D x Cylindrical Spherical r0/Rd = 10 Vbr(cyl)=0.4Vbr(planar) Vbr(spher)=0.18Vbr(planar) RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  12. Fluence, cm-2 The breakdown characteristics of 3D planar detectors at different fluences RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

  13. Conclusions 1. The simple analytical equations can be applied for the engineering of 3D detectors 2. At fluence of 1e16 neutrons/cm2 the pinch-off voltage is close to the breakdown voltage for cylindrical junction. 3. The type of 3D detectors J-O/Osurf with the dead ends of junction and Ohmick columns is promising for the high fluence application J/O-J/O J/O-Osurf J-Osurf J-O/Osurf J/O-SiO2 Thank you for you attention RD50 13-th meeting, CERN, 10-12 November, 2008 Vladimir Eremin

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