How Can I Define a Semiconductor Material?

Date	Category
2025-06-30 21:10:35	Charge

A semiconductor material is specified using the MultiPhysicsMedium, by setting its charge property to a SemiconductorMedium. The required parameters for the SemiconductorMedium are:

Density of States and Band Gap Energy

• N_c (PositiveFloat) – Effective density of states in the conduction band.
  Units: cm⁻³

• N_v (PositiveFloat) – Effective density of states in the valence band.
  Units: cm⁻³

• E_g (PositiveFloat) – Band gap energy.
  Units: eV

Electron-hole Recombination Mechanisms

Recombination mechanisms can include:

• Shockley-Read-Hall

• Radiative Recombination

• Auger Recombination

• R (List) – Array containing the recombination models to be applied to the material.

---

Optional Arguments

• delta_E_g – Slotboom model for band-gap narrowing

• N_a – Number of acceptor charges (holes). Units: cm⁻³

• N_d – Number of donor charges (electrons).
  Units: cm⁻³

The free carrier densities can be either a float number or a doping box object.

For a practical example, please refer to this example notebook.