Confined Flash Printing and Synthesis of Stable Perovskite Nanofilms under Ambient Conditions

The fabrication of stable perovskite nanofilm patterns is important for the development of functional optical devices. However, current production approaches are limited by the requirement for strict inert gas protection and long processing times. Here, a confined flash printing synthesis method is presented to generate perovskite nanofilms under ambient conditions, combining precursor transfer, perovskite synthesis, crystallization, and polymer protection in a single step within milliseconds. A laser simultaneously prints and induces the flash synthesis, confined in a polymer nanofilm, under normal ambient conditions. Due to its simplicity and flexibility, the method enables the combination and screening of many different perovskite precursor materials on various substrates. Besides for the development of novel perovskite materials and devices, the nanofilms can be applied for biodetection. The unique H₂O₂-responsive property of the ultrathin perovskite quantum dot film is applied for biomolecule detection based on oxidase-catalyzed enzymatic reactions. A new method, confined flash printing, allows for the rapid synthesis of perovskite nanofilms under ambient conditions. This approach combines precursor transfer, synthesis, crystallization, and polymer protection in a single step using a laser. The method's simplicity and flexibility support the development of various perovskite materials and devices, including applications in biodetection. image