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

Perovskite fiber-shaped optoelectronic devices for wearable applications

“…According to this hypothesis, a high electrical field may produce changes in relative crystallinity, crystallization half time, crystallization rate constant, and the Avrami exponent, among other factors. 81,182,183…”

“…According to this hypothesis, a high electrical field may produce changes in relative crystallinity, crystallization half time, crystallization rate constant, and the Avrami exponent, among other factors. 81,182,183 The influence of relative humidity on the electrospinning of perovskite composite nanofibers may be explained by the fact that DMF, the solvent utilized in these studies, is an aprotic polar with a high affinity for water. 184 It has been conceptualized that as the nanofibers fly from the spinning needle to the collector, DMF residue is washed away, resulting in the rapid crystallization of perovskite grains.…”

Emerging Intelligent Manufacturing of Metal Halide Perovskites

“…Uniform and orderly aligned perovskite thin films can be used to detect the polarization direction and degree of polarized light, as shown in Figure 4i. [ 94,107 ]…”

High Electrical Anisotropic Multilayered Self‐Assembled Organic Films Based on Graphene Oxide and PEDOT:PSS

“…This alignment can tune the electronic conduction in a specific direction and leads to electrically anisotropic films. [ 45–51 ] Here, we report a graphene‐based composite self‐assembled multilayered structure exhibiting extremely high electrical anisotropy, with the measured in‐plane conductivity five orders of magnitude higher than the cross‐plane value. Comparatively, the best‐reported electrical anisotropies reported to date in graphitic systems reach four orders of magnitude at room temperature, after several processes of mechanical stretching in order to align the conductive phases.…”