Simulation Study On Improvement Of LED Efficiency And Optical Surface Pe Rformance Based On Micro-nano Texture

Since the industrial revolution,energy problems have plagued countries around the world.With the increasing emphasis on energy in modern society,many energy-saving devices have emerged,including widely used light-emitting diodes(LEDs)and silicon batteries.Both LED and silicon photobatteries need to study the light path.Fresnel reflection occurs when light passes through the interface between the two media,which results in a decrease in the utilization of light in both LED and silicon batteries.In order to reduce the effect of Fresnel phenomenon on light utilization,researchers have proposed many solutions,including device surface roughening,photonic crystal control technology and surface microtexture technology.In this paper,the effect of surface microtexture on the optical performance of LED and silicon batteries is studied.LED and silicon batteries are two typical examples of light propagation paths.The transmission paths are from light-dense media to light-dense media and from light-dense media to light-dense media.Based on the anti-reflective mechanism of micro-nano structure on both sides,the influence of micro-nano structure on the propagation of two different light paths is studied.The electromagnetic field of LED and silicon battery is analyzed by computer simulation technology.Firstly,the structure,working principle and optical anti-reflection principle and method of LED and silicon battery are studied.The reasons for the low light utilization of silicon photobatteries and the low light extraction rate of LED are analyzed,which will lay a foundation for further simulation modeling.Then,the finite-difference time-domain method(FDTD)is used to study.Based on Maxwell's equations,the finite-difference time-domain method calculates the differential dispersion of electromagnetic waves and calculates the distribution of spatial electromagnetic fields.It is suitable for studying the effect of surface micro-nano texture on the propagation of electromagnetic waves in LED and silicon photobatteries.It is very effective for studying the optical propagation of surface micro-texture between LED and silicon batteries.Secondly,the surface electromagnetic field distribution of micro-texture on LED and silicon photovoltaic cell is analyzed by modeling and simulation.The spherical and conical micro-nano texture arrays on LED and silicon photovoltaic cell are established respectively,and the influence of structure parameters on light transmittance is analyzed respectively.Two light paths are analyzed: optical dense medium to Optical Sparse medium and optical dense medium to optical dense medium.For silicon photocells,the influence of micro-nano texture on Fresnel reflection is mainly studied and analyzed;for LED devices,the influence of micro-nano texture on total reflection and Fresnel reflection is mainly analyzed.The final analysis results show that the micro-nano texture has the effect of optical anti-reflection,the average reflectance can be control LED at 1.34% in silicon cell and the optical extraction can be increased to 20.31% in LED.