The Synthesis of 2D CH₃NH₃PbI₃ Perovskite Films with Tunable Bandgaps by Solution Deposition Route

Figure 8

Absorption spectra of the degraded MAPb(I_1-xBr_x)₃ prepared from MAI+MABr precursor solution at various molar ratios: (A) 100 : 0 w/o 5-AVAI; (B) 100 : 0; (C) 75 : 25; (D) 50 : 50; (E) 25 : 75; and (F) 0 : 100.