Sang Il Seok and co-workers have significantly improved the stability of the perovskite precursor solution and the resulting perovskite thin layer by adding sulfur to the precursor solution. The sulfur coordinates with the methylammonium cations in the solution, inhibiting de-protonation and increasing the chemical binding energy due to the interstitial sulfur ions in the perovskite lattice.-Scientific Journal cover design by scapiens

https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201970056