Preparation and Testing of Anisotropic MAPbI3 Perovskite Photoelectric Sensors

Abstract

Perovskite structures of organic and inorganic halides are peculiar structures with many interesting properties. Using their photoelectric effect, the structures have been used in photocells, photoelectric sensors, and light-emitting diodes. In conventional perovskite film crystallization, which is a one-step method, the MAPbI 3 crystals form disordered needlelike crystals at room temperature. Such needlelike crystal films have rough surfaces and low coverage to the substrate, resulting in insignificant photoelectric effects. With the assistance of an electric field and three-dimensional (3D) printing, the direction of the perovskite needlelike crystal can be arranged to make it orderly. In this way, the photoelectric sensor of the ordered MAPbI 3 perovskite needlelike crystal film can be prepared. This sensor has high sensitivity, high stability, and high response speed. Moreover, it has anisotropy and higher photoelectric sensitivity in the direction perpendicular to the needle crystal. Most interestingly, the sensors respond differently to polarized light in different directions, and this effect can be used to detect the direction and degree of polarization of polarized light.

Highly Stable Waterborne Luminescent Inks Based on MAPbBr3@PbBr(OH) Nanocrystals for LEDs and Anticounterfeit Applications

“…Luminescent materials can absorb energy in a certain way and convert it into radiation of light, leading to a wide variety of applications including in information displays, light-emitting technology, X-ray intensification and scintillation, biomarkers for diagnostics, sensor technologies, cellular imaging agents, and so on. − So far, many luminescent materials have been extensively investigated for such applications, including inorganic rare-earth or transition metal ion-doped inorganic phosphors, , inorganic semiconductor nanocrystals (NCs), organic dyes, transition metal complexes, and carbon dots . Especially, luminescent materials have been widely and efficiently used to prepare anticounterfeiting patterns, with an increasingly severe global issue in all kinds of commercialized productions, such as national card, paper currency, and checks, as well as detection of latent fingerprints, food, and medicines. − …”

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.…”

Investigations of Fused Deposition Modeling for Perovskite Active Solar Cells

“…Many of the FDM-oriented approaches have focused on uses like photoelectric sensing [16] or light production [17][18][19]. Zhao et al advanced the general formation of perovskite crystals from disordered to ordered via electric field, producing a more orderly crystal deposition for use in a photosensor with high sensitivity, high stability, and good response [16].…”

“…Many of the FDM-oriented approaches have focused on uses like photoelectric sensing [16] or light production [17][18][19]. Zhao et al advanced the general formation of perovskite crystals from disordered to ordered via electric field, producing a more orderly crystal deposition for use in a photosensor with high sensitivity, high stability, and good response [16]. Tai et al investigated several thermoplastic polymers as protective coatings for perovskite materials and incorporated the effort into light-emitting diode (LED) devices with various emission wavelengths.…”