Investigation On Diffusion Of Commercial Cz-Si Solar Cell

Currently, energy and environmental protection become the world’s two hot spots.With economic development and social progress, people have raised higher and higherenergy requirements, so searching for and developing pollution-free resources becomemore and more urgent. Solar energy is the most promising energy resource for it isclean and renewable. Solar cells based on photoelectric effect have been widely usedsince they were invented and it is believed a bright future with increasing efficiencyand decreasing cost.The photovoltaic conversion efficiency of Cz-Si solar cells is the highest, and thetechnology is also the most mature, but the cost is high. Reducing the cost andincreasing the photoelectric conversion efficiency of the solar cells is a majorchallenge to researchers and manufacturers. In addition to applying new technology inmanufacture, improving and optimizing production process is also very important toimprove the performance of solar cells, and the diffusion technique is more importantin research and manufacture of high-efficiency and low-cost solar sells.This paper firstly introduced the principle of solar cell and the commercial Cz-Sisolar cell production； then introduced the optimization methods of diffusiontechnology which include the research of diffusion uniformity; the comparative studyof one-sided diffusion and two-sided diffusion; the research on the relationshipbetween the front electrode grid and sheet resistance; the research on the relationshipbetween the yield and sintering of30-60/□; and commercial shallow emitters Cz-Sisolar cell with high efficiency. The photovoltaic conversion efficiency of Cz-Si solarcells have been improved by0.6%-0.8%from17.2%to17.8%-18%by improvingdiffusion technology and not increasing the cost to maximize the economic benefits,especially the Cz-Si solar cells are fabricated in the domestic production-line withregular process.Most of the Experiments on this paper are implemented in commercial Cz-Sisolar cell production line, so the experimental results and data will provide importantreference to production and further experiments.