Define nonradiative recombination parameters

[sbhasan]

Hi,

I am working with the PDD solver and need to define lifetime of the SRH and Auger constants in the material. I see these parameters are suggested in Eqs. (52, 54) of the paper so it seems one could modify them. If true, I would appreciate if someone could point out the variable names that reflect these properties in the python interface.

Thanks a lot for the wonder work and your support.

Kind regards,
Shakeeb

[phoebe-p]

Hi Shakeeb,
As it says in the paper, SRH recombination is account for through lifetimes (tau_n and tau_p), while Auger recombination is described in terms of the constants Cn and Cp which are NOT lifetimes but recombination coefficients with units m^6 s^(-1). See here: http://docs.solcore.solar/en/latest/Solvers/DeviceStructure.html. The table there also lists the units for these coefficients.

So the relevant values to set in the material definition would be something like:

GaAs = material('GaAs')
GaAs_with_recombination = GaAs(
        Na = si('3e16cm-3'), # p-type doing
        electron_minority_lifetime=3e-5, hole_minority_lifetime=2e-6, # for SRH recombination
        electron_auger_recombination=1e-40, hole_auger_recombination=1e-40, # for Auger recombination, units m^6 s^(-1)
        radiative_recombination=1e-16 # radiative recombination, units m^3 s^(-1)
        )

Setting these values in the material definition like this overrides any values which are in the materials database.

[sbhasan]

Hi Phoebe,
Thanks a lot for your detailed response! This certainly answers my original query.
I know it runs on a tangent to this thread but there's one more thing I am trying to discover which you might be able to quickly inform. From the PDD example, I see how to obtain the carrier concentration at equilibrium and short-circuit (for e.g. .short_circuit_data.Bandstructure['n']). For my work, I need this information at all values for which the current is calculated in the output. Is there a simple way to obtain this?
Thanks once again for your help and to the entire team for the excellent tool.
Kind regards,
Shakeeb