Measurement results of the irradiated mini-sensors

This page contains measurement results (IV/CV, etc.) of the mini-sensors that were irradiated at Boston General Hospital. These sensors are going to be used in the upcoming October testbeam.

Sensor descriptions and general information

All of the mini-sensors that were irradiated were supplied by Micron Semicondoctor. The sensor labels correspond to the type of silicon substrate (n or p), which wafer they were cut from, the type of mini-sensor (MS or MBP, explained below), as well as the location of this sensor on the half-moon structure it was cut from. The labels are oragnized as follows,

 
<company><substrate ID>-<wafer ID>-<sensor type><sensor location>
Definitions:
  • MSL: Micron Semiconductor Limited
  • 309x: 3091 corresponds to n-in-p type while 3092 corresponds to p-in-n type
  • MS: Mini-sensor, 30 um strip width, 80 um strip pitch, 1.115cm x 1.125cm
  • MBP: mini-beam pipe sensor, 30 um strip width, 80 um strip pitch. Locations 1 and 2 have different guard ring structures, shown below. The cutout has a radius of about 5mm.

Schematic of the half-moon structure the sensors were cut from. From the left we have MBP1, MS1, MS2 and MBP2. The smaller square structures are diodes.

MiniSensorUp.png

Zoomed in schematic of the guard ring of the MBP1 sensors:

MBPType1Zoom.png

Zoomed in schematic of the guard ring of the MBP2 sensors:

MBPType2Zoom.png

Irradiation information

Irradiation Group L1 L2 L3 L4
Radiation dose (Mrad) 1.57 5.77 10.10 23.31
Proton fluence [x1014 cm-2] 0.29 1.06 1.86 4.29
Neutron fluence eqv. [x1014 cm-2] 0.27 1.00 1.75 4.03

The protons were 226 MeV while the neutron equivalent is given for 1 MeV neutrons.

Sensor Characteristics

Sensor Depletion Voltage Doping Concentration (atoms/cm3) Resistivity (kOhm-cm)
MSL3092-1-MS2 181.782 5.09723 x 1012 0.875825
MSL3091-7-MBP1 171.113 5.13803 x 1012 2.70315
MSL3091-7-MBP2 172.492 5.12317 x 1012 2.71099
MSL3091-5-MS2 177.448 4.89929 x 1012 2.83488
MSL3092-1-MS1 180.556 5.05295 x 1012 0.883501
MSl3091-8-MS1 176.011 4.97939 x 1012 2.78927
MSL3091-7-MS1 175.804 4.8664 x1012 2.85404
MSL3091-7-MS2 177.903 5.03692 x 1012 2.75742
MSL3091-8-MBP2 178.739 5.16102 x 1012 2.69111
MSL3091-8-MBP1 177.161 4.57063 x1012 3.03873

The depletion voltage is derived from the $\frac{1}{C^2}$ vs. Voltage relationship. The doping concentration and resistivity are calculated using the geometry of the sensor, the primary carrier mobility (holes for n-in-p and electrons for p-in-n), as well as the calculated depletion voltage.

The doping concentration can be derived from the slope of a plot of $\frac{1}{C^2}$ vs. V for $V < V_{dep}$,

where $\epsilon$ is the dielectric constant of silicon, 1.034x10-14 F/cm3 and $q_e$ is the charge of the electron, 1.6x10-19 C, and A is the area of the silicon.

The resistivity is given by,

where $\mu$ is the carrier mobility of the silicon bulk. For p-type, the main carriers are holes, with a mobility of 450 $ cm^2 / V s $. For n-type, the main carriers are electrons, with a mobility of 1400 $ cm^2 / V s $.

Summary of current measurements before irradiation (Amps)

  Voltage (V)
Sensor 50 100 150 200 250 300 350 400 450 500
MSL3092-1-MS2 6.263E-08 6.622E-08 6.761E-08 6.852E-08 6.931E-08 6.988E-08 7.048E-08 7.117E-08 7.181E-08 7.236E-08
MSL3091-7-MBP1 2.74E-08 2.95E-08 3.02E-08 3.12E-08 3.26E-08 3.41E-08 3.59E-08 3.81E-08 3.98E-08 4.14E-08
MSL3091-7-MBP2 2.99E-08 3.19E-08 3.33E-08 3.42E-08 3.54E-08 3.60E-08 3.68E-08 3.77E-08 3.89E-08 4.01E-08
MSL3091-5-MS2 3.03E-08 3.35E-08 3.44E-08 3.49E-08 3.59E-08 3.83E-08 4.09E-08 4.41E-08 4.46E-08 4.99E-08
MSL3092-1-MS1 3.48E-08 4.04E-08 4.42E-08 4.68E-08 4.90E-08 5.08E-08 5.24E-08 5.38E-08 5.53E-08 5.65E-08
MSl3091-8-MS1 3.48E-08 3.73E-08 3.92E-08 4.04E-08 4.20E-08 4.36E-08 4.51E-08 4.68E-08 4.88E-08 5.13E-08
MSL3091-7-MS1 2.98E-08 3.34E-08 3.70E-08 5.68E-08 2.97E-07 3.53E-07 3.95E-07 4.31E-07 4.65E-07 4.75E-07
MSL3091-7-MS2 3.18E-08 3.65E-08 3.95E-08 4.17E-08 4.37E-08 4.54E-08 4.70E-08 4.83E-08 4.99E-08 5.18E-08
MSL3091-8-MBP2 2.88E-08 3.05E-08 3.18E-08 3.24E-08 3.33E-08 3.43E-08 3.51E-08 3.60E-08 3.71E-08 3.85E-08
MSL3091-8-MBP1 2.24E-08 2.47E-08 2.67E-08 2.81E-08 2.94E-08 3.17E-08 3.49E-08 3.79E-08 4.07E-08 4.39E-08

PreIVCombined.png

Summary of current measurements after irradation (Amps)

  Voltage (V)
Sensor 50 100 150 200 250 300 350 400 450 500
L1 MSL3092-1-2 2.428E-05 3.284E-05 3.512E-05 3.746E-05 4.187E-05 5.184E-05 6.955E-05 9.893E-05 1.485E-04 2.247E-04
MSL3091-7-MBP1 1.897E-05 2.643E-05 2.927E-05 3.033E-05 3.129E-05 3.232E-05 3.360E-05 3.528E-05 3.745E-05 4.029E-05
MSL3091-7-MBP2 1.918E-05 2.673E-05 2.967E-05 3.079E-05 3.179E-05 3.288E-05 3.422E-05 3.595E-05 3.817E-05 4.103E-05
MSL3091-5-MS2 2.286E-05 3.203E-05 3.591E-05 3.725E-05 3.868E-05 4.047E-05 4.271E-05 4.556E-05 4.917E-05 5.366E-05
L2 MSL3092-1-MS1 1.131E-04 1.211E-04 1.260E-04 1.302E-04 1.349E-04 1.431E-04 1.600E-04 1.928E-04 2.495E-04 3.331E-04
MSl3091-8-MS1 7.915E-05 1.083E-04 1.225E-04 1.289E-04 1.332E-04 1.372E-04 1.414E-04 1.460E-04 1.512E-04 1.570E-04
L3 MSL3091-7-MS1 1.259E-04 1.762E-04 2.047E-04 2.200E-04 2.300E-04 2.382E-04 2.461E-04 2.543E-04 2.628E-04 2.719E-04
L4 MSL3091-7-MS2 2.258E-04 3.245E-04 4.011E-04 4.545E-04 4.879E-04 5.128E-04 5.339E-04 5.530E-04 5.715E-04 5.900E-04
MSL3091-8-MBP2 1.927E-04 2.752E-04 3.388E-04 3.823E-04 4.095E-04 4.299E-04 4.472E-04 4.629E-04 4.780E-04 4.930E-04
MSL3091-8-MBP1 1.905E-04 2.723E-04 3.357E-04 3.803E-04 4.084E-04 4.293E-04 4.470E-04 4.631E-04 4.786E-04 4.939E-04

PostIVCombined.png

Summary of capacitance measurements before irradiation (pF)

  Voltage (V)
Sensor 30 50 70 90 110 130 150 170 190 210 230 250
MSL3092-1-MS2 119.99 91.97 77.39 68.16 61.66 56.81 52.98 49.90 48.15 47.87 47.76 47.70
MSL3091-7-MBP1 98.65 75.13 63.07 55.47 50.10 46.14 42.97 40.65 40.05 39.90 39.80 39.74
MSL3091-7-MBP2 99.25 75.47 63.30 55.60 50.20 46.19 43.00 40.60 39.92 39.77 39.66 39.60
MSL3091-5-MS2 126.01 94.57 78.62 68.68 61.86 56.75 52.74 49.56 48.36 48.14 48.02 47.91
MSL3092-1-MS1 119.38 91.59 77.03 67.81 61.35 56.53 52.75 49.69 48.09 47.82 47.73 47.67
MSl3091-8-MS1 122.07 92.94 77.78 68.27 61.66 56.66 52.74 49.62 48.59 48.39 48.26 48.19
MSL3091-7-MS1 126.20 94.71 78.58 68.65 61.79 56.64 52.62 49.49 48.46 48.27 48.14 48.08
MSL3091-7-MS2 130.60 96.24 79.83 69.63 62.63 57.40 53.34 50.13 48.91 48.69 48.56 48.50
MSL3091-8-MBP2 101.47 80.11 65.98 57.41 51.57 47.23 43.88 41.19 40.02 39.81 39.71 39.62
MSL3091-8-MBP1 82.80 67.30 58.70 51.50 46.40 43.10 40.00 37.50 36.70 36.70 36.70 36.90

Summary of capacitance measurements after irradiation (pF)

  Voltage (V)
Sensor 30 50 70 90 110 130 150 170 190 210 230 250
L1 MSL3092-1-MS2 326.66 224.23 174.61 143.43 121.28 102.68 88.73 84.35 81.82 79.61 77.60 75.70
MSL3091-7-MBP1 116.53 86.16 71.22 61.83 54.52 47.30 43.30 43.37 43.36 43.30 43.28 43.22
MSL3091-7-MBP2 117.10 86.55 71.56 62.07 54.79 47.58 43.24 43.22 43.24 43.20 43.13 43.06
MSL3091-5-MS2 159.39 114.99 93.90 81.13 72.16 64.74 56.82 51.30 51.34 51.53 51.49 51.44
L2 MSL3092-1-MS1 989.05 765.80 551.57 441.32 356.10 215.53 151.64 136.16 127.65 121.02 147.49 42.19
MSl3091-8-MS1 569.30 366.44 283.79 236.22 204.95 182.37 164.36 148.98 134.54 114.02 21.48 4.87
L3 MSL3091-7-MS1 812.57 612.50 473.80 394.04 341.76 304.71 276.33 31.64 5.78 2.78 1.70 1.15
L4 MSL3091-7-MS2 527.53 839.06 891.14 804.06 714.95 639.75 578.46 529.78 490.72 457.77 430.09 406.02
MSL3091-8-MBP2 550.59 785.35 739.47 643.88 561.46 497.34 448.02 409.40 378.23 352.13 329.72 310.54
MSL3091-8-MBP1 435.53 653.87 597.91 533.97 474.03 423.99 41.86 7.43 3.50 2.13 1.45 1.05

Total time spent above freezing after irradiation

This is the total amount of time the sensors have been above freezing after we placed them in our freezer here at Syracuse. This does not take into account the shipping time between Boston General and Syracuse. I still need to find this information.
Sensor TimeSorted ascending
MSL3091-7-MBP1 0
MSL3091-7-MBP2 0
MSL3091-5-MS2 0
MSL3091-8-MBP2 82 hours
MSL3091-8-MBP1 82 hours
MSl3091-8-MS1 89 hours
MSL3091-7-MS1 89.75 hours
MSL3091-7-MS2 89.75 hours
MSL3092-1-MS2 92.75 hours
MSL3092-1-MS1 92.75 hours

Detector board information

Each detector board contains two mini sensors. When referring to sensor 1 and sensor 2, if you are looking from the daughter board to the detector board, the left most is sensor 1 and the right most is sensor 2. (This is the labeling on the daughterboard, but does not match the readout scheme of the Beetle chip using the Aliabava system. So, these have been swapped in the list below)

Cartoons with definitions of Beetle Chip Num, Channel Num, Stage Motion direction for Board 1, Board 2,Board 3,Board 4

Board Number

  1. Milano daughter board
    • Sensor 0: 3092-1-MS2 p-in-n. Apply positive HV to the backplane. Irradiation level 1.
    • Sensor 1: 3092-1-MS1 p-in-n. Apply positive HV to the backplane. Irradiation level 2.
  2. Syracuse daughter board
    • Sensor 0: 3091-8-MS1 n-in-p. Apply negative HV to the backplane. Irradiation level 2.
    • Sensor 1: 3091-10-MBP2 n-in-p. Apply negative HV to the backplane. Un-irradiated.
  3. Zurich daughter board
    • Sensor 0: 3091-7-MS2. n-in-p. Apply negative HV to the backplane. Irradiation level 4.
    • Sensor 1: 3091-7-MS1. n-in-p. Apply negative HV to the backplane. Irradiation level 3.
  4. Syracuse daughter board
    • Sensor 0: 3091-8-MBP2. n-in-p. Apply negative HV to the backplane. Irradiation level 4.
    • Sensor 1: 3091-8-MBP1. n-in-p. Apply negative HV to the backplane. Irradiation level 4.

-- PeterManning - 29 Sep 2014

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng MBPType1Zoom.png r1 manage 71.8 K 2014-09-30 - 20:36 PeterManning  
PNGpng MBPType2Zoom.png r1 manage 59.8 K 2014-09-30 - 20:36 PeterManning  
PNGpng MiniSensorUp.png r1 manage 26.9 K 2014-09-30 - 20:36 PeterManning  
PDFpdf MotionStageDaughterCardCartoon_Board1.pdf r2 r1 manage 76.7 K 2014-10-25 - 10:07 StevenBlusk  
PDFpdf MotionStageDaughterCardCartoon_Board2.pdf r1 manage 77.6 K 2014-10-25 - 10:07 StevenBlusk  
PDFpdf MotionStageDaughterCardCartoon_Board3.pdf r3 r2 r1 manage 76.5 K 2014-12-10 - 16:02 StevenBlusk  
PDFpdf MotionStageDaughterCardCartoon_Board4.pdf r1 manage 78.0 K 2014-10-25 - 10:07 StevenBlusk  
PNGpng PostIVCombined.png r2 r1 manage 298.5 K 2014-09-30 - 20:32 PeterManning  
PNGpng PreIVCombined.png r1 manage 231.9 K 2014-09-30 - 20:16 PeterManning  
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Topic revision: r20 - 2015-06-26 - StevenBlusk
 
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