Highly Luminescent Transparent Cs<sub>2</sub>Ag<sub><i>x</i></sub>Na<sub>1–<i>x</i></sub>Bi<sub><i>y</i></sub>In<sub>1–<i>y</i></sub>Cl<sub>6</sub> Perovskite Films Produced by Single-Source Vacuum Deposition
Oleksandr Stroyuk, Oleksandra Raievska, Paz Sebastiá-Luna, Bas A. H. Huisman, Christian Kupfer, Anastasia Barabash, Jens Hauch, Henk J. Bolink, Christoph J. Brabec
Abstract
High Resolution Image Download MS PowerPoint Slide Thermal deposition of halide perovskites as a universal and scalable route to transparent thin films becomes highly challenging in the case of lead-free double perovskites, requiring the evaporation dynamics of multiple metal halide sources to be balanced or a single-phase precursor preliminary synthesized to achieve a reliable control over the composition and the phase of the final films. In the present Letter, the feasibility of the single-source vacuum deposition of microcrystalline Cs 2 Ag x Na 1– x Bi y In 1– y Cl 6 double perovskites into corresponding transparent nanocrystalline films while preserving the bulk spectral and structural properties is shown. The perovskite films produced from the most emissive powders with x = 0.40 and y = 0.01 revealed a photoluminescence quantum yield of 85%, highlighting thermal evaporation as a promising approach to functional perovskite-based optical materials.