Design And Fabrication Of High-resolution Perovskite Image Device

Photoelectric image devices refer to photoelectric devices that can convert optical signals into precise electrical signals.They have important applications in video imaging,fire detection,biomedical imaging,and motion detection.In recent years,perovskite has become a high-performance and easy-to-process photoelectric image device material due to its advantages such as adjustable bandgap,large absorption coefficient,high carrier mobility and low cost.Perovskite is used in image photodetectors,and its excellent performance and rapid development achieved are obvious to all.However,due to the low resolution of traditional manufacturing technology and the single absorption spectrum of the material,it is difficult to meet the manufacturing requirements of high-resolution full-color image devices.In this regard,this paper proposes to use electrohydrodynamic printing technology(EHD)to prepare high-resolution perovskite patterns,optimize the printing film forming process and device design,and finally realize the preparation of flexible full-color perovskite image devices,and further design and prepare passive perovskite image devices for artificial eyes applications are as follows:(1)Research on EHD printing on demand and perovskite film forming and crystallization technology.The electrohydrodynamic printing technology is used to prepare patterned perovskites.A solution suitable for electrohydrodynamic printing is prepared by introducing a new high-viscosity solvent,methyl amine acetate(MAAc),which avoids the use of anti-solvents in the air and helps delay the crystallization of perovskite to improve the quality of the film.Furthermore,the preparation of high-resolution patterned films was achieved by optimizing printing on-demand process.The influence of the pre-crystallization temperature on the formation of perovskite crystallization films was studied,and the optimal pre-crystallization temperature was combined to obtain the best performance.Photodetector device.(2)Design,preparation and application research of full-color perovskite image devices.First,the bandgap is changed by adjusting the ratio of perovskite halogen elements;using the electrohydrodynamic printing to deposit three sub-pixel arrays with specific absorption spectra;device design is carried out to prepare a complete full-color perovskite image device.Then,the photoelectric properties such as I-V and I-t of the sub-pixels of the abovementioned devices in response to light sources of different wavelengths were characterized,thereby verifying the potential of high-resolution imaging devices and flexible devices.In the end,the device successfully realized the color recognition and photoelectric imaging of the set color "HUST" light source pattern signal,laying the foundation for the application of the electrohydrodynamic printing in the field of full-color perovskite photoelectric image sensors.(3)Design,preparation and performance test of passive perovskite artificial retinal imaging device.The spin-coating method is used to prepare the perovskite functional layer,and the patterned electrode and encapsulation layer are introduced to develop the design and preparation of a passive perovskite artificial retina image device.The photoelectric performance of the imaging device has been systematically studied,such as the response speed of the device,the influence of different light intensities and light pulse frequencies on the output photocurrent and photovoltage,and the performance verification of the potential applications of artificial retinas in the future has been launched.