Solution-Processed Reduced-Dimensional Cesium Lead Halide Perovskites

This work introduces a solution-processed approach for growing <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{Cs}_{2} \text{PbX}_{4}$</tex> nanostructures on <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{CsPbI}_{2} \text{Br}$</tex> thin films, achieving effective control over interface morphology. The surface of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{CsPbI}_{2} \text{Br}$</tex> thin films is modified through CsCl posttreatment using various organic solvents. Careful optimization of post-treatment parameters, including solvent selection and processing conditions, ensures uniform nanostructure growth and improved interfacial properties. This strategy significantly reduces defects and enhances charge transport, leading to efficient and stable Cs-based perovskite solar cells (PSCs).