In this work, thanks to 3D modelling, we were able to express the effective broadcast length as a function of dimensions (x, y) of crystal, loss rate at the limits of x and y, temperature and magnetic field, based on the distribution of carriers in the base volume, obtained from the minority carrier continuity equation. The effective broadcast length and short circuit current were calculated as a function of grain size, magnetic field and temperature. It was found that the short-circuit current is independent of the effective broadcast length but also on the grain size, magnetic field and temperature. This shows that the electrical parameters cannot be extrapolated to larger effective broadcast lengths since it is limited for a given optimal temperature, magnetic field and grain size. Also, a small effective broadcast length can be due to a small carrier scattering length, a small grain size, a high temperature or a high magnetic field.
