Organic-inorganic lead halide perovskites (APbI3) have shown tremendous growth in solar cell efficiencies, however, our atomistic understanding of the intrinsic instability due to the A-cations size effects is far from...

I extend my thanks to the professors and staff of the São Carlos Institute of Chemistry (IQSC-USP) for their sympathy and for making the institute pleasant and conducive to learning and scientific production. Thank you all very much! "There is nothing more stimulating than a case where everything goes against you.

Meus agradecimentos ao conselho nacional de desenvolvimento científico e tecnológico (CNPq) pelo suporte financeiro, ao