Internal quantum efficiency of back illuminated n+ pp + solar cells

Abstract
A theoretical analysis of the Internal Quantum Efficiency (I.Q.E.), taking into account the generation in the p+ layer of the back illuminated n+ pp+ solar cells has been carried out, and compared to that of the structure illuminated in the conventional way. Experimental cells have been made both by ion implantation and by alloying Al-Si to form the p+ layer. Very thin cells, here reported, present excellent values up to 90 % for the back illuminated to front illuminated I.Q.E. ratio