pvdeg.collection.calculate_jsc_from_tau_iqe#

pvdeg.collection.calculate_jsc_from_tau_iqe(tau, wafer_thickness, d_base, s_rear, spectrum, absorption, wavelengths, w_emitter=0.36, l_emitter=15, d_emitter=5, s_emitter=10000.0, xp=2.4e-07)[source]#

Return cell Jsc given lifetime and cell parameters.

Calculates Jsc via calculating cell internal quantum efficiency (IQE) and absorption for Si

Parameters:

  • tau (numeric) – Carrier lifetime [us].

  • wafer_thickness (numeric) – Wafer thickness [um].

  • d_base (numeric) – Minority carrier diffusivity [cm²/Vs].

  • s_rear (numeric) – Rear surface recombination velocity [cm/s].

  • spectrum (array-like) – photon flux density solar spectrum.

  • absorption (array-like) – absorption coefficient of Si, e.g. loaded from ‘photovoltaic’ library [1].

  • wavelengths (array-like) – wavelength series (nm) for absorption coefficient and solar spectrum.

  • w_emitter (numeric, default 0.36) – Emitter thickness [um].

  • l_emitter (numeric, default 0.5) – Diffusion length of the emitter [um].

  • d_emitter (numeric, default 4) – Minority carrier diffusivity in the emitter [cm²/s].

  • s_emitter (numeric, default 4.86e5) – Front surface recombination velocity [cm/s].

  • xp (numeric, default 0.00000024) – width of the depletion region [m]. Treated as fixed width, as it is very small compared to the bulk, so injection-dependent variations will have very small effects.

Returns:

jsc (numeric) – Short circuit current of the solar cell [mA/cm²]

Notes

Default emitter parameters w, l, d, and s are supplied, but users may wish to experiment to find the most suitable parameters to model different cell types. Default values are adapted from [2] and [3].

Pros of this approach:

requires only fundamental inputs: Si absorption and spectrum

Cons:

does not account for any anti-reflection or light trapping

To do:

accept user inputs for spectrum and absorption, otherwise use photovoltaic library

References

in 2014,” IEEE Journal of Photovoltaics, vol. 5, no. 4, pp. 1250–1263, Jul. 2015 doi: 10.1109/JPHOTOV.2015.2430016.

“Internal quantum efficiency for solar cells,” Solar Energy, vol. 82, no. 2, pp. 106–110, Feb. 2008, doi: 10.1016/j.solener.2007.07.010.

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