Optimization of MAPbI 3 Film Using Response …
407
Fig. 10 Three-dimensional (3D) response surface and contour plot for efficiency of PSC and effect
of a ratio of PbI 2 and CH 3 NH 3 I (X 1 ) and spin speed (X 2 ); X 3 (annealing temperature) = 80 °C,
b ratio of PbI 2 and CH 3 NH 3 I (X 1 ) and annealing temperature (X 3 ); X 2 = 2500 rpm, and c spin
speed (X 2 ) and annealing temperature (X 3 ); X 1 = 3.00
407
Fig. 10 Three-dimensional (3D) response surface and contour plot for efficiency of PSC and effect
of a ratio of PbI 2 and CH 3 NH 3 I (X 1 ) and spin speed (X 2 ); X 3 (annealing temperature) = 80 °C,
b ratio of PbI 2 and CH 3 NH 3 I (X 1 ) and annealing temperature (X 3 ); X 2 = 2500 rpm, and c spin
speed (X 2 ) and annealing temperature (X 3 ); X 1 = 3.00