Low-demanding in situ crystallization method for tunable and stable perovskite nanoparticle thin films

Metal halide perovskite nanocrystals can display excellent light-emission properties, leveraging the chemical versatility of this family of materials. However, using these features in functional films is an elusive task due to aggregation and material-instability problems. Using a metal-organic host matrix based on a sol-gel approach allows for a controlled in situ crystallization of perovskite nanocrystals with extremely low-demanding fabrication methods. As a result, this ambient annealing-free process generates high-performance nanocomposite thin films with photoluminescence quantum yield (PLQY) >80% with outstanding ambient and mechanical stability. The crystallization dynamics determining the final nanoparticle size, and thus the emission properties, can be adjusted in detail through the ambient exposure and precursor concentration.