Spatially Resolved Local Ideality Factor by means of Differential Electroluminescence Imaging

This work features a method to obtain the spatially resolved distribution of the local ideality factor, n
loc
, based on variations in terms of the saturation of the recombination current from the difference of injected currents between neighboring points. The methodology to obtain the local ideality factor mapping is applied on the characterization of solar cells fabricated following Al-BSF compatible techniques. Starting from the EL counts distribution, the voltage map is obtained, followed by the horizontal and vertical current distributions up to the obtaining the local ideality factor map.