Аннотация
This work introduces a solution-processed approach for growing$\text{Cs}_{2} \text{PbX}_{4}$nanostructures on$\text{CsPbI}_{2} \text{Br}$thin films, achieving effective control over interface morphology. The surface of$\text{CsPbI}_{2} \text{Br}$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).