Control Fabrication And The Photogenerated Carrier Transport Behaviors Of CH₃NH₃PbBr₃ Microstructures With Different Exposed Facets

Organic-inorganic perovskite materials CH3NH3PbA3(A =I,Br,Cl)have excellent optoelectronic properties,thus the organic-inorganic perovskite materials are widely used in many optoelectronic devices,such as solar cells,photodetectors,and photoelectrocatalysis.At present,there is still controversy over the transport mechanism of photogenerated carriers for organic-inorganic hybrid perovskite materials.Studying the transport behavior of in-plane carriers within the organic-inorganic perovskite materials has profound implications for improving the performance of optoelectronic devices.However,the ultrafast propagation speed of carriers places very high demands on the characterization methods of materials,and it is difficult for conventional instruments and equipment to capture ultrafast carriers.Fluorescence confocal microscope can realize the monitoring of the optical signal under the steady state and transient state of the fluorescent material,and can display the carrier information in the form of images.It is the most novel and the most development space in the current optical signal characterization science.Photodetectors can realize the transformation from optical signals to electrical signals,and can also play an important role in the study of carrier transport.In this dissertation,CH3NH3PbBr3 is chosen as the research object,microcrystals with(001)and(110)predominant exposed surfaces were synthesized by the template method,and confocal fluorescence microscopy was used to construct micro-photodetectors for carriers in two dominant planes.The in-depth study of the transmission behavior provides experimental guidance and theoretical support for the design of new photoelectric materials.(1)The rod-like CH3NH3PbBr3 crystallites with the(110)crystal plane as the main exposed surface were synthesized via a template method and their material properties have been tested with various characterization methods;(2)The CH3NH3PbBr3 crystallites with the(001)plane as the main exposed surface were synthesized by the template method and tested for material characterization;(3)Micro-photodetectors were constructed to investigate the carrier transport behavior of CH3NH3PbBr3 crystallites on different exposed surfaces.(4)The carrier transport behavior of CH3NH3PbBr3 crystallites on different exposed surfaces was studied by confocal fluorescence microscopy.