A comprehensive study on the effect of a cascade structured triple absorber layer configuration in a perovskite- based solar cell has been studied using a simulation method. Three structures comprising single, double, and triple absorber layers sandwiched between Nb2O5 and P3HT layers are investigated. The main purpose of this study is to improve the power conversion efficiency (PCE) of the device by using three absorber layers creating a suitable route for electron flow, based on optimization of the thickness of the absorber layers. The Cs2AgBiBr6, MAPbI3, and CsSnI3 perovskites are utilized as absorber layers. The maximum PCE of 19.90 % can be achieved with a thickness of 100 nm for all the three absorber layers. In the following, the thickness of each absorber layer is varied individually by keeping constant the other two absorber layers. In this regard, PCE increases slightly to 20.37 % by decreasing the thickness of the Cs2AgBiBr6 layer down to 10 nm. Moreover, by increasing the thickness of the CsSnI3 layer into 400 nm, PCE of the triple cell enhances to 22.26 %. This result shows that incorporation of multi-absorber layers for obtaining a cascade property is a suitable route to improve the overall performance of the perovskite-based solar cells.
