  In the last few years there is an unprecedented progress in the increase of
the power conversion efficiency of perovskite solar cells. Evidently, further
advances of the efficiency of these devices will depend on the constraints
imposed by the optical and electronic properties of their constituents. Quite
apparently that during the manufacturing process of a solar cell, there is an
inevitable variation in the thicknesses of various functional layers, which
affects the optoelectronic characteristics of the final sample. In this work a
possible strategy of the analysis of the solar cell performance is suggested,
based on statistically averaging procedure of experimental data. We present a
case study, in which the optoelectronic properties of the meso-structured
perovskite solar cell (with a mesoporous TiO$_2$ layer) are analysed within the
method providing a deeper understanding of the device operation. This method
enables an assessment of the overall quality of the device, pointing pathways
towards the maximum efficiency design of a perovskite solar cell by material
properties tuning.
