Research On Carrier-induced Degradation And Regeneration Effect Of Crystalline Silicon Solar Cells

With the rapid development of photovoltaic industry dominated by crystalline silicon solar cells,the quality requirements for solar cells and their components are also increasing,and the photo-attenuation effect of crystalline silicon solar cells is also receiving more and more attention.In this paper,the light induced degradation effect of crystalline silicon solar cells is studied,and the experimental study on carrier induced degradation and regeneration recovery of crystalline silicon solar cells is carried out.A defect of using gray value of electroluminescence image of crystalline silicon solar cell is proposed..(1)In order to overcome the energy consumption problem of light injection,this paper designs a set of experimental devices integrating collector injection anti-light decay and electroluminescence test using the principle of electroluminescence of crystalline silicon solar cells.A defect in the analysis of the gray value of the illuminating image.According to the principle of electroluminescence,select the appropriate near-infrared camera and lens,and select the appropriate filtering and image processing algorithms,and build the corresponding experimental device.(2)Electro-injection and light-injection induced decay experiments on crystalline silicon cells.Through the analysis of the electrical properties of the silicon cells,it can be clarified that both methods can cause 3%-5% attenuation of the single crystal silicon battery.By analyzing the grayscale attenuation variation of the battery electroluminescence image,it can be concluded that the battery defect is not uniform,the attenuation and regeneration are synchronous,and the attenuation difference of different regions is large.The exponential model is used to fit the attenuation rate and the carrier injection conditions,the fitting effect is very good.(3)Electro-injection and light-injection regeneration recovery experiments on crystalline silicon cells.Through the analysis of the battery’s electrical performance,it can be determined that the battery’s electrical performance can eventually recover to more than 99% of the initial value.By analyzing the dark,bright and global gray values of the battery electroluminescence image,it is found that the overall recovery effect of the battery is very good,and even the performance of some regions exceeds the initial value;the exponential model is used to fit the regeneration rate and the flow injection conditions,the fitting effect is very good.The experimental results also show that it is feasible to reflect the change of battery performance by using the change of the gray value of the electroluminescence image,and the effect is very good.