Recently, the team of associate researcher Zhao Chenyang of the School of Chemistry and Environmental Engineering of Shenzhen University and the team of associate researcher Wu Xiaohan of the School of Microelectronics of Fudan University published the title "Flexible and Filter" in the journal "Small" (impact factor 13.3, JCR1 area of Chinese Academy of Sciences, TOP journal) -Free Color-Imaging Sensors with Multicomponent Perovskites Deposited Using Enhanced Vapor Technology" research paper. Shenzhen University is the first communication unit.
A photodetector is a photoelectric device that outputs light signals as electrical signals. It has a wide range of applications ranging from national defense security to small ones in daily life, such as photoelectric communication, automatic driving, environmental monitoring, color imaging, etc. In recent years, metal halide perovskite materials have been widely used in the field of optoelectronics due to their large absorption coefficient for the entire visible light region, adjustable band gap, longer carrier diffusion length and lifetime, and easy preparation, including Solar cells, light-emitting diodes, lasers, photodetectors, etc. However, a single photodetector made of perovskite material can only detect the intensity of light signals, but cannot recognize colors. In order to achieve the purpose of color perception, the patterning of perovskite materials is imperative. Currently reported patterned perovskite material arrays mostly use solution methods such as photolithography, and the process is relatively complicated and cumbersome. The gas-phase method can also be used to prepare patterned perovskite materials, but the photoelectric properties of the thin films prepared by this method are generally weak, which limits its application in the field of color imaging.
A high-quality perovskite film was prepared on a substrate treated with a monolayer of protonated 3-aminopropyltriethoxysilane by a vapor-phase thermal evaporation method. Studies have shown that compared with the perovskite film on the untreated substrate, the film has the advantages of fewer grain boundary defects, larger grain size, stronger light absorption efficiency, and longer fluorescence quantum lifetime. The photodetector based on the film exhibits excellent light response characteristics, long-term environmental stability, and mechanical flexibility. Three kinds of patterned perovskite film arrays with different halogen components are prepared by this method, which realizes the recognition of red, green, and blue colors and color imaging. Therefore, the research work successfully verified the feasibility of high-performance, multi-component patterned perovskite materials for flexible filterless color imaging sensors, and revealed its application prospects in other optoelectronic fields, such as hyperspectral imaging.
