The Optical Resonant Behavior Of Perovskite?CH₃NH₃PbI₃? Microcavity Under Pressure

In this paper,the micro-nano optical technology has been used in the high pressure field.Given the characteristics of the high pressure technology,we set up the in-situ dark field spectroscopy to try to measure the photoluminescence of the single perovskite nanowires under pressure and we use it to realize the photoluminescence measurements of the single perovskite nanowires under pressure.We use the photoluminescence of the single perovskite nanowire to explore its spontaneous emission and stimulated radiation under high pressure.This results are shown in the following three parts:We adopt surface-liquid growth method to synthesize CH3NH3 Pb I3 nanowires and other micro-nano structures.We discover the regulating effect of the concentration of CH3NH3 I on CH3NH3 Pb I3 nanowires growth and confirm that its near saturation can implement shape optimization of the nanowire structures.We prepare the regular shape,smooth surface and good monodispersity perovskite nanowires.We have combined the micro-nano optical technology and the high pressure technology to realize the micro operations and spectral characterization of the micro-nano structure on the surface of the diamond anvil cells(DAC).1)Using the submicron level precision work station and the tungsten tip by the electrochemical corrosion technique,single nanowires is separated from thin film samples and transfer to the DAC sample chamber.2)We adopt upright-inverted double microscope optical design to realize the spectral measurement of a single microstructure based on the type-Boelher-DAC.The design realizes the dark field observation under pressure and improves the optical observation method contrast of the micro-nano samples in DAC.This technology makes the characterization of micro-nano optics under high pressure easier to implement.We use the high pressure in-situ micro zone spectrum system to measure the photoluminescence of the single perovskite nanowires under pressure.The semiconductor nanowires have been preliminarily researched for the laws of s spontaneous emission change with pressure.We have achieved the characterization of the spectral properties of the single perovskite nanowires under high pressure.Not only can it help to better understand the behavior of exciton and lasing phenomenon under pressure,but also provide a feasible technical route for conducting the research of micro-nano optical in the high pressure field and make a beneficial trial to explore.To sum up,we put the micro-nano manipulation,micro-nano optical characterization techniques and DAC high-pressure experimental technology in together and set up a suitable high pressure in-situ micro zone spectrumequipment for single semiconductor micro-nano structure to provide a technical solution for the interdiscipline of micro-nano optics and high pressure science.It laid a solid technical foundation for regulating semiconductor nanowires lasering behavior under the pressure.