The simulation result shows that the diffusion length and carrier lifetime decreased with the increment of defect density (here, Lp=Ln and τp= τn for MAPbI3-based cell). From the result, it can say that maximum efficiency can be achieved when Lp=Ln is 5.10×10 2 μm to 1.60×10 1 μm and τp= τn is 1.00×10 7 to 1.00×10 4 . The optimized defect density value for MAPbI3-based cell is 1.00×10 13 (1/cm 3 ), where an efficiency of 27.1% can be achieved.