Working on the developing of a European standard for DD testing

Goal of the study

• Propose a DD test standard
• Should be available by the end of the year after ESA and Components
Technology Board (CTB)/Radiation Working group (RWG) comments
• Goal of this presentation
⇒ Not a draft of the future guidelines, but:
• Remind the physical processes responsible of the displacement damages
• Remind the electrical effects
• List the main parameters that should be taken into account
Thierry Nuns. Senior Engineer at Space Environment Group at ONERA.

Working on the developing of a European standard for DD testing

Energy transfer from particle to matter

  •  Particle slowed down by transfering energy to the matter.Energy transfer from particl
  •  Main part of the deposited energy is ionisation (interaction with the electrons), the rest is atomic displacements (interaction with the nuclei).
  •  Fraction depends on particle type and energy, target material.
  •  Fraction decreases when the energy increases.
  •  Displacement damage: degradation in the bulk of the device.

Particle matter interaction for DD

3 main interaction types, different energy transfers:
• Coulombian
• Nuclear elastic
• Nuclear inelastic

Increasing transfered energy to the Primary Knock-on Atom and cascade size

• Single displaced atom or interaction cascade
• Creation of Frenkel pairs (vacancy-interstitial pairs) or more complex lattice defects (high concentration of deposited energy)
• Reorganisation of these pairs into stable defects. Phase of “annealing”
• Introduction of levels in the gap that modify the electrical properties of semiconducto

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