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Calculations of 3D Weighting Field Profiles for 3D Detectors. Zheng Li G. Carini, M. Li. 3rd Workshop on Advanced Silicon Radiation Detectors (3D and P-type Technologies, Barcelona, Spain, April 14-16, 2004. BNL 3D detector: 1 column design. n + (column),0. p + , 0. p + (implant),0.

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slide1

Calculations of 3D Weighting Field Profiles for 3D Detectors

Zheng Li

G. Carini, M. Li

3rd Workshop on Advanced Silicon Radiation Detectors (3D and P-type Technologies, Barcelona, Spain, April 14-16, 2004

slide2

BNL 3D detector: 1 column design

n+(column),0

p+, 0

p+ (implant),0

n+, the collecting

electrode column, 1

slide3

n+

n+

cut plane @ 1um

cut plane @ 2um

n+

n+

cut plane @ 4um

cut plane @ 10um

Weighting field highest near the surface

slide4

n+

n+

cut plane @ 20um

cut plane @ 30um

n+

n+

cut plane @ 50um

cut plane @ 70um

Weighting field highest near the collecting n+ column, lowest under p+ electrodes,

and is at ½ strength in the middle (non-zero)

slide5

n+

n+

cut plane @ 150um

cut plane @ 250um

n+

cut plane @ 268um

cut plane @ 271um

slide6

Potential

Cutline

Cutline

slide7

cut plane @ 280um

cut plane @ 290um

Some weighting field still exists near

the unprocessed back side (non-zero)

cut plane @ 300um

slide8

BNL 3D detector: 2 columns design

p+

n+(column)

p+ (column)

n+, the collecting

electrode column, 1

slide9

n+

n+

cut plane @ 0um

cut plane @ 150um

n+

n+

cut plane @ 268um

cut plane @ 250um

Weighting field highest near the collecting n+ column, lowest between p+ columns

And non-collecting n+ column, and is at about ½ strength in the middle (non-zero)

slide11

cut plane @ 271um

cut plane @ 275um

cut plane @ 278um

cut plane @ 281um

slide12

cut plane @ 285um

cut plane @ 290um

Some weighting field still exists near

the unprocessed back side (non-zero)

cut plane @ 300um

slide13

3D detector: BNM/ITC - IRST

p+

n+(column)

p+ (column)

n+, the collecting

electrode column

slide14

cut plane @ 0um

cut plane @ 7um

cut plane @ 17um

cut plane @ 12um

Weighting field lowest near the surface of p+ columns

slide15

cut plane @ 18um

cut plane @ 20um

cut plane @ 24um

cut plane @ 28um

slide16

n+

n+

cut plane @ 30um

cut plane @ 50um

n+

n+

cut plane @ 150um

cut plane @ 250um

Weighting field highest near the collecting n+ column, lowest between p+ columns

And non-collecting n+ column, and is at about ½ strength in the middle (non-zero) (same)

slide18

n+

n+

cut plane @ 269um

cut plane @ 271um

n+

n+

cut plane @ 280um

cut plane @ 273um

slide19

n+

n+

cut plane @ 285um

cut plane @ 290um

Weighting field at the surface of n+ columns

is similar to that of the STC 3D detector

n+

cut plane @ 300um

slide20

Summary

  • Weighting field in 3D detectors is highly non-uniform
  • But it is distributed all throughout the detector (for pitch  50 µm)
  • In the middle of the cell (between 4 columns), the weighting field is about

half of the maximum

  • So the main limiting factor for CEE in 3D detectors may be electric fields