The Research Of Light Materials Which Are Used To Improve The Efficiency Of Crystal Silicon Solar Cell

In this paper,the crystalline silicon solar cells with high market share are selected as the research object.The main research problems are the low photoelectric conversion efficiency and the high cost.We start from the main factor lead to the solar cell photoelectric conversion effect low,plans to use the conversion of luminescent materials which can transform the short wavelength light to long wavelength light.At the same time the crystalline silicon solar cells are relatively low utilization for short wavelength and can respond to higher for long wavelength.It just make up the corresponding curve of crystalline silicon and the best area inconsistent of standard solar spectrum.Thereby improving the photoelectric conversion efficiency of the battery.In the course of the experiment,we choose the commonly used method of preparing nano particles: hydrothermal method.Using this method to prepare the nano particles can make the size relatively small which can meet the needs of the application model.Based on the premise of industrial application,we choose a relatively simple application model: composite the fluorescent material and the EVA film which is used to packaging the solar cell.And then applied to the surface of the crystalline silicon solar cells directly.This method not only doesn't change the original industrial production process,but also the selected model is conductive to industrial production requirements.At the same time,this method to increase the relative value of crystalline silicon solar cell photoelectric conversion efficiency is relatively stable.The rare earth organic complexes with Eu and Yb as the central ion and YAG:Ce3+,Yb3+ were prepared by hydrothermal reaction and molten salt calcinations respectively.Comparing the relative fluorescence quantum efficiency and fluorescence intensity of the rare earth complex.The experimental results showed that the Eu(BA)3 is selected as down conversion luminescent material.The excitation peak located at 200 nm to 400 nm and the emission peak is located at 616 nm.The particle size and morphology of the samples were measured by scanning electron microscopy.The results shows that the particle size of the optical fiber is about 20 nm.The evenly spherical sample can be prepared under a certain pH conditions.The selected YAG:Ce3+,Yb3+ can be excited at 400-600 nm,the emission peak is located near 1030 nm which belongs to the characteristic emission of Yb3+.The spherical sample has a particle size of about 1?m.Later we compound two kinds of fluorescent materials and EVA film,the composite film devices are received.The prepared composite film is covered on the surface of the crystalline silicon solar cell.The performance parameters of the modified battery are tested.It is find that the Eu(BA)3@EVA film increased the short circuit current density of the battery to about 0.93mA/cm2,photoelectric conversion efficiency is relatively increased by about 0.31%.After application of YAG:Ce3+,Yb3+@EVA composite film,the short circuit current density of the crystalline silicon cell is increased by about 1.45mA/cm2 and the photoelectric conversion efficiency is improved by about 0.51%.Compared with the composite film,the YAG:Ce3+,Yb3+@EVA composite film is better than the Eu(BA)3@EVA.