Ligand-Free In Situ Synthesis of Stable Perovskite-Inorganic Polymer Composites

Metal halide perovskite (MHP) is a promising candidate to achieve Rec. 2020 with size independently high color purity when their size is over exciton Bohr diameter. Ligands are widely accepted to control the crystallization of MHP. However, since the binding of ligands is based on weak electrostatic attraction, the stability of the MHP crystal is limited. Also, the ionic nature of MHP reduced their stability against the ambient environment. Here, we report the facile ligand-free synthesis method comprising perhydroxypolysilazane (PHPS). PHPS crystalized to SiO2-SiNx inorganic polymer composites and interact with MHP precursor to control the crystallization of MHP crystal. Synthesized MHP crystal was effectively encapsulated by an inorganic polymer matrix and showed high stability against high-temperature, water, and ambient environment.