The Research On Preparation Process Of Polycrystalline Silicon Solar Cell With High Efficiency

Over these years, photovoltaic technology is considered to be the main way to solve the energy crisis and the environment problems. As the polycrystalline silicon solar cell occupied most of the photovoltaic market, and showed an increasing trend year by year, there is great potential for the polycrystalline silicon solar cell to develop. This paper illustrates the domestic PV market trends and the development of photovoltaic technology firstly, and makes a brief introduction on the preparation process of polycrystalline silicon solar cell secondly: cleaningâ†'diffusionâ†'wet etchingâ†'PECVDâ†'screen printingâ†'sinteringâ†'testing and sorting. At the same time, I optimized every main process parameter, and some new materials and new technologies were also included, such as the thinning thickness of the wafer, sheet resistance of diffusion, the concentration of wet etching solution, printing speed, the introduction of screen printing polyester mesh version and PECVD double layers. After a series of optimization of process parameters and introduction of new technology, made the final conversion efficiency of polycrystalline silicon solar cell rising by 0.3%.In addition to the above, this also analyses the matching problem of each process parameters. For example: the thinning thickness of cleaning process matching with the follow-up process, light diffusion process matching with PECVD, screen printing and sintering process, wet etching process matching with double-side diffusion process, the top electrode design matching with the light diffusion process. After a series of research and experiments on process parameters matching problems, making the final system conversion efficiency of polycrystalline silicon solar cells have increased about 0.3%.In this paper, a series of optimization on preparation process of polycrystalline silicon solar cells are all based on not changing the structure of the solar cell, not introducing additional materials and new equipment. No additional cost in this case, so that the final conversion efficiency of cells obtained from the initial 15.9% to 16.5%, further enhancing the competitiveness of polycrystalline silicon solar cell.