| Perovskite Solar Cells(PSCs)have been a hot research topic in the field of photovoltaic in recent years.From 2009 to now,the photoelectric conversion efficiency has increased from 3.8% to more than 25%.At present,the efficiency improvement is mainly studied from the following aspects: first,the study of new battery material components;The second is to improve the layer interface of the battery;The third is to develop new component additives.Besides,the light absorption capacity of PSCs also has an important influence on the photoelectric conversion efficiency of the battery.Photonic crystal is a kind of artificial crystal structure with photonic band gap,which can cause a series of extreme optical effects,especially the "slow light" effect.It can effectively enhance the interaction between the incident light and the material to improve its absorption efficiency.Therefore,we use Rsoft software to introduce photonic crystal structure into PSCs and the "slow light" effect is used to improve the light absorption efficiency of the absorption layer.The focus of this paper is mainly reflected in the following aspects:Firstly,we briefly introduce the structure and working principle of PSCs,and focus on the current research status of PSCs and the application of photonic crystal structure in solar cells.Secondly,we optimize the structure of two kinds of photonic crystals: dielectric column and air hole in this paper.We design two kinds of lattice arrangement,tetragonal lattice arrangement and hexagonal lattice arrangement.We simulate four kinds of fully symmetric scatterers,tetragonal column,hexagonal column,octagonal column and cylindrical.We also expand two kinds of partially symmetric scatterers,elliptical column and circular platform.The influence of height H and width D of scatterer on absorption efficiency is studied.Finally,a kind of perovskite photonic crystal absorbing layer with wide wavelength,wide Angle and high absorption is designed.The experimental results show that: under the tetragonal lattice arrangement of cylindrical In As scatterers,the absorption layer with the scatterer height H of 0.6 ?m and width D of 0.95 ?m achieves the highest light absorption efficiency.The absorption layer structure achieves 87.56%light absorption efficiency for the sunlight with the wavelength of 300?1200 nm.Compared with the non-photonic crystal structure,the absorption layer is 60.90% higher,and has better adaptability to the incident light Angle.The absorption efficiency can maintain more than 70% in the sunlight incidence range of 0?90°.Thirdly,the influence of defect structure on absorption efficiency is analyzed.In this paper,we simulate the change of absorption efficiency of absorption layer with point defect,line defect and a mixture of the two.The experimental results show that the existence of defect structure will cause the decrease of absorption efficiency,especially when two kinds of defects exist at the same time,the absorption efficiency decreases by nearly 9% compared with perfect photonic crystal.It also has an important influence on the adaptability of incident light angle,especially at high incident light angle.Fourthly,we analyze the "slow light" effect produced by the absorption layer with different shapes of scatterers from the perspective of mechanism and quantify the "slow light" effect produced by the absorption layers of each photonic crystal structure by using the normalized delay bandwidth product NDBP.which corresponds to the absorption efficiency data obtained in previous experiments.It further shows that the fundamental reason for the improvement of absorption efficiency is due to the "slow light" effect caused by the band gap characteristics of photonic crystals.In general,a two-dimensional perovskite photonic crystal solar cell absorption layer with high light absorption efficiency is designed in this paper.We can further improve the photoelectric conversion efficiency of the cell and promote the innovative development of PSCs through a more efficient light management strategy. |
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