Organic-inorganic hybrid perovskite optical ferroelectric semiconductors have attracted the interest of scientific researchers in the field of optoelectronic devices due to their combination of ferroelectricity and excellent semiconductor properties. However, the effective regulation of the Curie temperature of the two-dimensional hybrid perovskite ferroelectric is still a challenge. For organic-inorganic hybrid perovskite ferroelectrics, the order-disorder movement of organic cations is a key factor in driving the ferroelectric phase transition. Increasing the phase transition barrier of this rotationally driven hybrid perovskite ferroelectric can be Significantly increase its Curie temperature. The confinement effect of guest molecules in organometallic framework materials provides a new idea for rationally regulating the Curie temperature of two-dimensional hybrid perovskite ferroelectrics.
Luo Junhua, a researcher at the State Key Laboratory of Structural Chemistry of Fujian Institute of Physics, Chinese Academy of Sciences, and his team used ethylamine as a “limiting hole rotor†to synthesize a two-dimensional double layer and a two-dimensional three-layer hybrid calcium. Titanium ore optical ferroelectric semiconductor. The structure and theoretical calculation analysis show that as the number of inorganic framework layers increases, the pore confinement effect of ethylamine increases, which leads to the increase of the ferroelectric phase transition energy barrier driven by the ethylamine rotor. Experiments have found that the Curie temperature (370 K) of the two-dimensional three-layer perovskite ferroelectric is higher than that of the two-dimensional double-layer perovskite ferroelectric (326 K). Studies have shown that ethylamine is an effective "restricted hole rotor" for the design of high Curie temperature two-dimensional organic-inorganic hybrid perovskite optical ferroelectric semiconductors, and is a reasonable design for high Curie temperature hybrid perovskite optical ferroelectric semiconductors with excellent semiconductor properties. Ferroelectric semiconductors provide new ideas.
Recently, relevant research results were published in the form of communication in "Angewandte Chemie International Edition 2020, DOI: 10.1002/anie.202011270). Peng Yu, a doctoral student jointly trained by Fujian Institute of Physics and Shanghai University of Science and Technology, was the paper First author. The research work was funded by the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Basic Frontier 0-1 Original Innovation Project of the Chinese Academy of Sciences, and the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences.
Ceiling lamps are widely used in the home.
Compared with other types of lamps, ceiling lamps are very economical. The installation and cleaning of such lamps are very simple.
Ceiling Lamp,Ceiling Lights,Chandelier Light,Led Ceiling Lights
JINGYING , https://www.jingyingoptical.com