Preparation Of Perovskite Structure Materials And The Study Of Photoelectric Properties

Since 2014,with the development of computers and other technologies,perovskite materials as new semiconductor materials are widely used in optoelectronics,photovoltaic devices and other fields,especially in the LED and solar cells,it have caused people's height attention.At present,there are many reports on 2D and 3D perovskites,while there are few studies on two-dimensional-three-dimensional hybrid perovskites.Compared with the three-dimensional perovskite,twodimensional-three-dimensional hybrid perovskites have the characteristics of larger band gap and adjustable emission peak position.Therefore,the properties of twodimensional-three-dimensional hybrid perovskites are studied in detail will further improve the applications of perovskite in the optoelectronic devices and photovoltaic devices.Two-dimensional hybrid perovskite is a self-assembled multi-quantum well structure,which can be controlled by changing the ratio of different elements and the ratio of organic and inorganic groups.Therefore,the study of the two-dimensional-threedimensional hybrid perovskite luminescent properties and the movement of electrons and holes in perovskite will play an important role in the application of LED and other devices.In this paper,we refer to the existing research results,and?PEA?₂?CH₃NH₃?_n-1Pb_nI_3n+1was used as a research system to explore the characteristics of two-dimensional-threedimensional hybrid perovskites.The main contents are as follows:?1?The research status of perovskite in optoelectronic devices and photovoltaic devices is analyzed,and the preparation process and method of the characterization are introduced in detail.?2?Through the design experiment,we found that the optimal rotational speed of the prepared two-dimensional-three-dimensional hybrid perovskite films was 6000 revolutions,and the best time?40-50 seconds?of adding chlorobenzene was proved.?3?The optical properties of two-dimensional-three-dimensional hybrid perovskite films were studied by photoluminescence spectroscopy and absorption spectroscopy.It is found that this two-dimensional-three-dimensional hybrid perovskite is not a single phase,but contains various components with different n values.The transfer of electrons and holes in the perovskite films was studied by means of transient absorption spectroscopy.It is found that the direction of electrons transfer is from small n phase to large n phase,and the direction of the holes transfer is opposite to that of electron.On this basis,we explored the influence of sample quality to the transmission of electrons and holes.When the quality of the sample is good,the electrons could be transmitted from small n phase to large n phase,and the holes were transmitted from large n phase to small n phase,and when the sample quality is not good,electrons and holes will not be able to pass between different n values perovskite.?4?The positive and negative surfaces of the samples were tested by photoluminescence spectroscopy.It is found that the distribution of different n values perovskite is small n phase mostly distributed on the surface of the substrate,and the large n phase is much more distributed on the surface of the sample.?5?Two-dimensional-three-dimensional hybrid perovskite lines were prepared by crystallization method,and the lines were preliminarily characterized by photoluminescence spectroscopy.It was found that the perovskite lines was similar to that of the films,it is a multiphase material.