Simulation On Anti-reflection/light-trapping Properties Of Uniform And Hybrid Structures On Silicon Solar Cell

With the rapid development of renewable energy,photovoltaic power generation will be one of the key directions of future research and development.As a core part of photovoltaic power generation,solar cells are an important factor in the development of photovoltaic power generation technology.The surface microstructure can reduce the reflection of incident light on the surface of the solar cell,reducing optical loss,thereby improving conversion efficiency.In this paper,moth-eye structure,rectangular pyramid structure and cylinder structure were used as the research object.Firstly,the broadband anti-reflection properties of three uniform structures were studied.Secondly,based on the uniform structure,the broadband anti-reflection properties of bi-hybrid and multi-hybrid structures were analyzed.Finally,the anti-reflection and light-trapping properties of the uniform and hybrid structures based on the front and back surfaces of ultra-thin crystalline silicon cells were studied.The details are as follows:1.The uniform moth-eye structure,uniform rectangular pyramid and uniform cylinder structure based on infinite thickness body silicon were simulated by time-domain finite difference method.The influences of structural parameters on reflectivity were analyzed.The results show that in the wavelength range of 300-1200 nm,for the uniform moth-eye structure(uniform rectangular pyramid),when the bottom surface diameter(bottom width)is constant,the average reflectance becomes smaller as the height increases;when the height is constant and not less than100 nm,as the diameter of the bottom surface(the width of the bottom surface)increases,the average reflectance decreases firstly and then increases.The best average reflectance of the uniform moth-eye structure and the uniform quadrangular pyramid structure can be less than 1%,and uniform cylindrical structure has poor anti-reflection performance.2.On the basis of uniform structure,the bi-hybrid structure based on infinite thickness bulk silicon was simulated firstly,and the anti-reflection properties of bi-hybrid structure and uniform structure were compared,and the excellent anti-reflection properties of hybrid structures were explained from the reflectance curve and electric field intensity distribution,Secondly,based on the bi-hybrid structure with improved anti-reflection properties,the three-hybrid structure and the four-hybrid structure were simulated.The results show that the average reflectivity of the three bi-hybrid structures in the wavelength range of 300~1200 nm and 400~1100 nm can be lower and the anti-reflection performance is improved compared with the uniform structure.On the basis of the bi-hybrid structure,the three-hybrid moth-eye structure and the three-hybrid rectangular pyramid structure have lower average reflectance in the wavelength range of 400~1100 nm and improved anti-reflection properties.3.On the basis of ultra-thin crystalline silicon solar cells,the uniform and hybrid structure of two surfaces were simulated.The results show that three bi-surface uniform structures have superior anti-reflection and light-trapping performance,and the bi-surface uniform moth-eye structure can achieve the optimal short-circuit current density of 28.37 mA/cm~2.On the basis of the uniform structure of the double surface,the short-circuit current density corresponding to the three bi-hybrid structures can be improved.On the basis of the bi-surface bi-hybrid structure,the short-circuit current density corresponding to the three-hybrid moth-eye structure and the three-hybrid rectangular pyramid structure can be higher,the bi-hybrid and three-hybrid structures can achieve better anti-reflection and light-trapping properties.