Cation and anion substitutions in hybrid perovskites: solubility limits and phase stabilizing effects

TL;DR

This study investigates how cation and anion substitutions affect the solubility limits and phase stability of hybrid perovskites, which are crucial for optimizing their use in high-efficiency solar cells.

Contribution

It provides a systematic analysis of structural and optoelectronic properties of mixed hybrid perovskites using X-ray diffraction and photoluminescence spectroscopy.

Findings

Identification of solubility limits for various cation and anion combinations.

Correlation between composition, phase stability, and optoelectronic properties.

Insights into how substitutions influence crystal structure and band gap.

Abstract

Organic or inorganic (A) metal (M) halide (X) perovskites (AMX3) are semiconductor materials setting the basis for the development of highly efficient, low-cost and multijunction solar energy conversion devices. The best efficiencies nowadays are obtained with mixed compositions containing methylammonium, formamidinium, Cs and Rb as well as iodine, bromine and chlorine as anions. The understanding of fundamental properties such as crystal structure and its effect on the band gap, as well as their phase stability is essential. In this systematic study X-ray diffraction and photoluminescense spectroscopy were applied to evaluate structural and optoelectronic properties of hybrid perovskites with mixed compositions.