Preparation of Ordered MAPbI₃ Perovskite Needle-Like Crystal Films by Electric Field and Microdroplet Jetting 3D Printing

Abstract

The crystallization of the perovskite structure of organic and inorganic halide depends on its composition and environmental condition. The most convenient method for the preparation of MAPbI3 perovskite films is the one-step method on TiO2 substrate, which will produce disordered needle-like MAPbI3 perovskite films with poor surface morphology. The electric polarity of MAPbI3 perovskite needle-like crystals was used to arrange the MAPbI3 perovskite needle-like crystals and prepare orderly MAPbI3 perovskite needle-like crystal films to improve their surface morphology. A microdrop-on-demand jetting 3D printing system that can simply add physical fields such as electric field was used to print perovskite narrow line films, which helps to improve the anisotropy of perovskite films. At room temperature and under electric field, ordered needle-like MAPbI3 perovskite crystal film can be obtained to improve the morphology and performance of perovskite film. This phenomenon is helpful for us to explore the influence and application of electrical polarity in the preparation of perovskite needle-like crystal films