Influence of Perovskite Layer Parameters and Back Contact Material on Characteristics of Solar Cells

The article is devoted to the numerical simulation of a perovskite solar cell with the FTO/TiO2/CH3NH3PbI3-xClx/Cu2O/Me structure in the SCAPS-1D program. The effect of the thickness and defect concentration in the perovskite layer CH3NH3PbI3-xClx, as well as the work function of the back contactmaterial (Me), on the photoelectric characteristics of a solar cell has been studied. It was found that the optimal thickness of the CH3NH3PbI3-xCIx layer is 600-700 nm, and the defect concentration should be less than 1014 cm(-3). It is shown that the work function of the back contact material must be greater than or equal to 5 eV to create solar cells with high efficiency. A maximum efficiency of 21.55% was obtained (short circuit current 24.87 mA/cm(2), open circuit voltage 1.1 V, fill factor 78.82%) for the structure of a perovskite solar cell with a carbon (C) back contact. The results can be used in the design and manufacture of efficient and inexpensive perovskite solar cells.