Perovskite Thin Films for Optoelectronic Devices: Study of their Stability

The last 15 years of scientific research in the field of photovoltaics have been dominated by materials such as perovskites. Due to their promising optoelectric properties, the interest in perovskites and their use in photovoltaics is growing year by year. Studies show that non-linear optical effects (NLO) occur in thin layers of perovskites, which allows for new applications, for example, the generation and modulation of light. Apart from the many advantages that perovskites have, there is a problem related to their stability. Perovskites are highly hygroscopic materials and very sensitive to external conditions. This is the main reason for stopping the commercialization of devices containing perovskites. This work presents the results of spectroscopic studies of the influence of external conditions on the stability and NLO results of perovskite thin films as CH
3
NH
3
CdI
3
and CH
3
NH
3
PbCl
3
. A solution was proposed to extend the lifetime of perovskite thin films by covering them with a thin layer of tin (IV) oxide or lead (II) iodide, which will not have a significant effect on the optoelectric properties of the studied perovskites.