Effects of HTL/ETL properties on the performance of (FAPbI3)0.85(MAPbBr3)0.15 perovskite solar cells

Mixed cation perovskite solar cells (PSCs) have shown high stability over 1000 h under outdoor conditions. In this paper, we simulated fluorine-doped tin oxide/TiO2/(FAPbI(3))(0.85)(MAPbBr(3))(0.15)/ Spiro-OMeTAD solar cell as the base structure by SCAPS-1D software. We then studied the effects of E (V) position of hole transport layer (HTL) and E (C) position of electron transport layer (ETL) and carrier density of HTL and ETL, on the performance of the solar cells. Simulation results showed that the carrier density of HTL and ETL has outstanding effect on the performance of the mixed cation PSC through band alignment between the layers. Moreover, we studied the influence of defect density of ETL/perovskite and perovskite/HTL interface layers. According to simulation results, we predict that using Spiro-OMeTAD as HTL and Nb-doped TiO2 as ETL, that have shown capability of fabrication with PSCs, improves the power conversion efficiency to 19.75%.