Research On Two-Dimensional Material Photodetector Based On Micro-Nano Structure Regulation

Two-dimensional materials have very good potential for use in the field of nanodevices.Graphene is an excellent feature with ultra-wide spectral absorption,good electrical and thermal conductivity,and high carrier mobility,which makes it have potential applications in the field of photodetection.However,as a photosensitive material of a photodetector,graphene itself has two disadvantages.First,since graphene is a substantially two-dimensional material having no thickness and absorbs little light,the light absorption of a single layer of graphene is only 2.3 %,The external quantum efficiency of graphene-based photodetectors is very low;second,graphene is a two-dimensional material with no band gap,which leads to its lack of selectivity for light,which limits the effect of graphene in some Applied research.Antimonene,a new two-dimensional material,was found in 2016.Antimonene has a wide bandgap compared to graphene and also has better stability than two-dimensional materials such as black phosphorus,thus attracting a wide range of researchers.In this paper,first-principles calculations of antimony were carried out,and the antimony was combined with the micronano structure through simulation to improve the light absorption rate of the antimony ene photodetector.For the antimony metal,the photocurrent of the material was calculated by NanoDcal,Provide a theoretical reference for the application of the material,the main research contents are as follows:The NEGF-DFT method,linearly polarized light and elliptically polarized light irradiation in the central region of antimony give the electric transport,the results show that antimony structure due to anti-symmetry of the space,so at 0V bias,either linearly polarized Or circular polarized light irradiation,antimony olefin photocurrent size is basically zero.When a voltage is applied across the electrodes,the space inversion symmetry of the structure is destroyed,so that the photocurrent greatly increases.Moreover,this chapter calculated the extinction ratio and the anisotropy ratio of the material by different angles of polarized light,and found that antimony has a very good extinction ratio and anisotropy ratio.According to the principle of surface plasmon of metal-plated AAM,we simulated the metal-plated AAM using FDTD Solutions simulation software,built the metal-plated AAM model and measured the reflectivity of the three metals of gold,silver and aluminum using simulation software AAM with different metal thickness(10nm-60 nm,10nm interval)was also simulated and its reflectivity was measured.It was found that when the thickness of Au was 30 nm,Also through the 30 nm thickness of the metal AAM to make the electric field distribution diagram,also found that most of the AAM absorption of light in the AAM hole wall and surface intersection,which also ensures that when we transfer the two-dimensional material on the AAM,the metal-plated AAM The absorbed light is better transmitted to the two-dimensional material so that the light absorption of the two-dimensional material photodetector is increased.