Application And Surface Texturization Of Monocrystalline Silicon Wafers

At present, crystalline silicon solar cells still hold a dominant position in photovoltaic power generation. Moreover, the monocrystalline silicon solar cells occupy a certain market share, because of its high photoelectric conversion efficiency, long service life, cost reduction and other advantages. The photoelectric conversion efficiency of silicon solar cells can reach about 20% in the industry. This paper used a new monocrystalline silicon wafers cut by diamond wire as the research object, and adopted a superior alkaline solution with low cost to proceed the surface texture.This paper compared monocrystalline silicon wafers cut by diamond wire with traditional monocrystalline silicon wafers cut by mortar, discussed the influence of alkaline solution in two kinds of cut process of monocrystalline silicon wafers, and analysed the samples’surface morphology, reflectivity, and the performance of solar cell after the surface texture. The results shows that the surface damage layer thickness of monocrystalline silicon wafers cut by diamond wire is only 3-5 μm, lower than the monocrystalline silicon wafers cut by mortar (12-17 μm), illustrating that diamond wire cutting process can effectively reduce the loss of silicon material. Under the condition of center wavelength of 650 nm, the original monocrystalline silicon wafers cut by diamond wire has a high reflectivity of 42.36%, however, the reflectivity of the original monocrystalline silicon wafers cut by mortar is only 30.63%. Using alkaline solution to proceed surface texture to the original silicon wafers which obtained by two different process can effectively reduce the surface reflectivity. After surface texture, the surface reflectivity of monociystalline silicon wafers cut by diamond wire is only 10.80%, apparently lower than the surface reflectivity of monocrystalline silicon wafers cut by mortar (11.87%).To compare the efficiency performance of two kinds of surface texture solar cell, we compared the photoelectric conversion efficiency of solar cell in the same period for two different cutting processes. The results show that the average photoelectric conversion efficiency of solar cell produced by diamond wire cutting process is as high as 19.60%, whereas the monocrystalline silicon wafers cut by mortar average photoelectric conversion efficiency is 19.46%, indicating that the new diamond wire cutting process can improve the cell photoelectric conversion efficiency of 0.14%.