The influence of single, double absorber layers based on perovskite solar cells has attracted considerable attention of researchers in the last few years; according to their promising output parameters such as short-circuit current (JSC), open-circuit voltage (VOC), fill factor (FF) and power conversion efficiency (PCE). The present work makes under study and investigation the comparison modelling between the two configurations of ITO/C60/MAPb(I1-xClx)3/ Spiro-OMeTAD /Au and ITO/C60/MAPb(I1-xClx)3/MASnI3/Spiro-OMeTAD /Au, the problem of lower absorption materials such as MAPb(I1-xClx)3 limits its output photovoltaic applications. Nevertheless, the need to use a prime candidate of the lead-free MASnI3 for grading with the first absorber layer that leads to absorbing a wider quantity of light spectrum, which boosting up efficiency. The simulating software of SCAPS-1D is used to examine our proposed models. The optimal output parameters (JSC, VOC, FF, and PCE) are obtained in this simulation are 27.69 mA/cm2, 1.37 V, 89.1%, and 33.66%.
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