Effect of the solution chemistry on the film growth of hybrid MAPbI3 perovskites

This work is focused on studying the chemical equilibrium phenomena of precursor solutions used to growth hybrid inorganic–organic MAPbI3 perovskite films. Special emphasis was made on the effect of important variables such as solvents type, ligands, temperature, and concentration on the chemical equilibrium and subsequent effect on film morphology. These results provided important information to develop a novel synthesis route based on chemical bath deposition (CBD) method that allowed to grow thin films of MAPbI3 with grain sizes greater than 10 μm and high degree of crystalline ordering, features that led to getting MAPbI3 films with improved stability. The proposed CBD method, in addition to being novel for the growth in solution of MAPbI3 thin films, is scalable, low cost, and promising, since it offers great prospects for the manufacture of highly stable perovskite hybrid solar cells.