Monocrystalline silicon solar cell is the solar cell with the highest conversion efficiency
Among the silicon solar cells, which type of cell has the highest conversion rate? There is no doubt that it is the monocrystalline silicon solar cell, which not only has the highest conversion rate, but also has the most mature technology. High-performance monocrystalline silicon cells are based on high-quality monocrystalline silicon materials and related thermal processing techniques. Nowadays, the electrical and ground technology of monocrystalline silicon has become more and more mature, because in the previous battery production, various technologies such as surface texturing, emitter passivation, and zone doping were generally used, and developed The batteries are mainly composed of planar monocrystalline silicon cells and monocrystalline silicon cells with grooved buried gate electrodes.
In order to improve the conversion efficiency, it is mainly to rely on the microstructure treatment of the single crystal silicon surface and the partition doping process. In this regard, the Fraunhofer Freiburg Solar Energy System Research Institute in Germany has always maintained a world-leading level. The institute uses photolithography to texture the surface of the battery into an inverted pyramid structure. At the same time, the 13nm-thick oxide passivation layer and the two layers of anti-reflection coating are combined on the surface.
Then the ratio of the width and height of the gate is increased through an improved electroplating process: and then the conversion efficiency of the battery obtained by the above Over 23%, the maximum can reach 23.3%. For now, the conversion efficiency of large-area (225cm2) monocrystalline solar cells prepared by Kyocera can reach 19.44%, and the conversion efficiency of planar high-efficiency monocrystalline silicon cells (2cm X 2cm) can reach 19.79%, and the grooved buried gate The conversion efficiency of the electrode crystalline silicon battery (5cm X 5cm) can reach 8.6%.
Therefore, in general, the conversion efficiency of monocrystalline silicon solar cells is naturally the highest, which makes it still occupy a very important position in large-scale applications and industrial production.