Study On Photoelectric Properties Of Perovskite And Graphene

In the 21 st century,with the rapid development of science and technology,people are eager for new energy sources than ever before,especially for new optoelectronic devices.For new energy batteries based on perovskite and graphene,the battery efficiency has undoubtedly grown the fastest in just a few years,which is beyond the reach of other materials.Therefore,in order to better explore the photoelectric properties of perovskite and graphene,perovskite,graphene and metasurface are combined to make a detailed analysis in the terahertz region.In recent years,the terahertz band has been explored by people.The emergence of metasurface makes it out of the harsh research conditions in the laboratory,so that terahertz optoelectronic devices break through the barriers,and have great application potential for future lightemitting devices,absorbing devices,and biosensors.In this paper,terahertz optoelectronic devices are designed,simulated and fabricated by combining perovskite,graphene and metasurface structure.The photoelectric properties of perovskite and graphene in terahertz band are observed,mainly including the following aspects:(1)The broadband absorber in THz band is designed and simulated by electromagnetic simulation software CST.Using structured perovskite and graphene,the conductivity of the active material is changed by external excitation to play a regulatory role.Three control methods are used:adjusting to perovskite,adjusting to graphene,adjusting to perovskite and graphene.The results show that the optimal scheme is that the Fermi level of graphene is at leV,and the conductivity of perovskite is at 100000S/m.The absorption efficiency is up to 99.5%.This study proposes a more convenient and efficient innovative idea for new terahertz absorbers.(2)Summarize the existing work of the electromagnetically induced transparencylike phenomenon(EIT-Like)on the metasurface.With the help of electromagnetic simulation software,the optoelectronic devices based on the terahertz electromagnetically induced transparency-like principle are designed,simulated and fabricated.The physical mechanism is analyzed.The high sensitivity of the transparent window is used to achieve ultra-sensitive detection.In the experiment,the movement of the Fermi level of graphene between the valence band,the Dirac point,and the conduction band is also observed.The photoelectric properties of graphene are more intuitively explained,and the modulation depth can reach a maximum of 182%.Using the electromagnetically induced transparency-like characteristics,another terahertz optoelectronic device was designed.The modulation depth of the device reached 300.1%,which has been further improved and has far-reaching reference value for future terahertz wave modulation devices.Figure[35]Table[3]Reference[96]...