The proposed all perovskite non-toxic cell structure is given in figure During simulation, the solar radiation spectrum is set as AM 1.5G with 300 o K temperature and illumination is set to 1000W/m 2 for the simulation. The hole thermal velocity and electron thermal velocity is 1×10 7 cm/s while band-to-band recombination is taken as 2.3×10 -9 Cm 3 /s.