  A theoretical approach to photoconversion efficiency modeling in perovskite
p-i-n structures is developed. The results of this modeling compare favorably
with the experiment and indicate that the surfaces of the perovskite solar
cells (SCs) are naturally textured. It is shown that photoconversion efficiency
in the limiting case of negligible Shockley-Read-Hall and surface recombination
and in the absence of optical losses reaches the value of 29%. In the realistic
case, the current-voltage curve ideality factor equals 2. This value is not due
to recombination in the space-charge region; rather, it can be explained by
taking into account the effect of the rear surface and high excitation level.

Mesoscale and Nanoscale Physics