The Study Of Optimization Of Finger On Industrial Crystalline Silicon Solar Cells

Improving the efficiency of solar cells is always the most important goal of craft optimization. Finger, as a key part of solar cells, can collect and derive the current which comes from the photovoltaic effect, therefore, improving and researching finger technique are very important to improve the efficiency of the solar cells. For this reason, we have made a series of systematic, more in-depth researches, as follows:1. Through the matching experiment with metal paste and printing plate, we find a rule that can improve printing fluency and efficiency of the cells effectively, the photoelectric conversion efficiency of the best combination of polycrystalline silicon solar cells have reached16.60%. And then through the design of test plates, we simplify the test and get a clear way to measure.2. To adjust the addition of organic solvent for example, it proved the importance of paste element balance for the printing effect and solar cells performance, When the quality score of terpinol is0.175%, The maximum of productivity is5.654KW/h.3. Compare different square resistance with different printing finger width. The results show that improving diffuse square resistance and reducing the finger width appropriately can promote the short-circuit current and efficiency. But limited to the increase of the resistance, the square resistance and finger width have an optimal value, with the Matlab simulation model, we can find out the solution in some condition. It is63.2Ω/□and95.3871μm, and maximum efficiency is16.528%.4. The way of LIP insteads of traditional screen printing to form new finger, with laser selective diffusion process, in order to optimize the material and structure. Through the exploration of LIP, we want to find the key factors to improve efficiency.5. Summarize each experimental conclusion, develop a set of industrial crystalline silicon solar cells finger integrated optimization scheme. With a mass-production, the average efficiency have reached16.76%,0.25%higher than general condition.