MD8 Programme

Note Mini & MD8 irradiations are usually to 1.6×1015 neq/cm2 except for additional odd batches irradiated with neutrons to 5×1014 neq/cm2 to allow depletion voltage measurements. The Test Chip & MD8 are irradiated to 5×1014 neq/cm2 (odd) for protons and 1.6×1015 neq/cm2 (even) for neutrons. Only Test Chip & MD8 are gamma irradiated.

For the MD8 structure, the IV and CV tests can be performed in one voltage sweep (MD8_IVCV) or can be performed separately (MD8_IV & MD8_CV).

a) MD8_IV Current/Voltage test on the MD8 diode

From the specifications, the I(V) values in 10 V steps with temperature and humidity values should be logged for each applied voltage step.

We also need to record the following test-specific properties:

  • SOURCE_METER (Required): Identifier/model of source meter used for measurements (string)
  • RSERIES: (Required) Series resistance used in the setup for the test (Ohm) (float)
  • ALGORITHM: (Not required) Extraction algorithm name and version (string)

For each voltage starting from 10 V the following 4 raw parameters: will be obtained and recorded in the text data file but not uploaded to the DB:

  • Set voltage [V]
  • Current [A]
  • Temperature [°C]
  • Humidity [%]

The following raw parameter should be recorded in a float array:

  • VOLTAGE: (Required) Set voltage [V]

The following derived parameter should be recorded for each voltage in an additional float array:

  • NORM_CURRENT: (Required) Current/cm2 normalized to 20ºC (to -20ºC after irradiation) (A/cm2)

The following 2 extracted parameters should also be recorded as floats:

  • NORM_CURRENT_500V: (Required) Current/cm2 at 500 V normalized to 20ºC (to -20ºC after irradiation) (A/cm2) (float)
  • VBD: (Required) Breakdown voltage (V) (float) (in case breakdown is not visible, there will be some way to denote this, e.g. an arbitrary “code number” - TB

Thresholds:

  • Before irradiation:
    • Leakage current/cm2 (@500 V) (RH < 20%) < 10-7 A/cm2
    • Breakdown voltage, VBD > 500 V
  • After irradiation to 1.6×1015 neq/cm2:
    • Leakage current/cm2 (@500 V) normalized to -20°C < 10-4 A/cm2
    • Breakdown voltage, VBD > 500V.

b) MD8_CV Capacitance/Voltage test on the MD8 diode

From the specifications, C(V) values in 10 V steps with temperature and humidity values should be logged for each applied voltage step.

We also need to record the following test-specific properties

  • LCR_METER: (Required) Identifier/model of LCR meter used for measurements (string)
  • SIGNAL_AMPLITUDE: (Required) LCR source voltage/amplitude (float) [V]
  • SIGNAL_FREQUENCY: (Required) LCR frequency (float) [kHz]
  • CIRCUIT_MODEL: (Required) LCR circuit model – ‘CR-Series’/‘CR-Parallel’ (string)
  • SOURCE_BIAS: (Required) Identifier/model of source used for biasing (string)
  • ALGORITHM: (Not required) Extraction algorithm name and version (string)

For each voltage starting from 10 V the following 5 raw parameters will be obtained and recorded in the text data file but not uploaded to the DB:

  • Set voltage [V]
  • Capacitance [pF]
  • Resistance [Ω]
  • Temperature [°C]
  • Humidity [%]

The following raw parameter should be stored in a float array:

  • VOLTAGE: (Required) Set voltage [V]

The following derived parameter should be recorded for each voltage in an additional float array:

  • CAPACITANCE: (Required) Capacitance/cm2 [pF/cm2]

The following extracted parameter should also be recorded as a float:

  • VFD: (Required) Full depletion voltage [V]

Thresholds:

  • Before irradiation:
    • Depletion voltage, VFD < 350 V