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)

Returns 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 [cm^2/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 [cm^2/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/cm^2]

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

[1]

“photovoltaic.” pvedu/photovoltaic

[2]

1. Fell et al., “Input Parameters for the Simulation of Silicon Solar Cells in 2014,”

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

[3]

23. 10. Yang, Z. Q. Ma, X. Tang, C. B. Feng, W. G. Zhao, and P. P. Shi, “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.