The embodiment of high-efficiency solar battery conversion efficiency

China attaches great importance to the research and development of solar storage batteries. As early as the Seventh Five-Year Plan period, the research work of amorphous silicon semiconductors has been listed as a major national topic; during the Eighth Five-Year Plan and the Ninth Five-Year Plan period, China puts emphasis on large-area solar storage batteries etc. In October 2003, the National Development and Reform Commission and the Ministry of Science and Technology formulated a solar energy resource development plan for the next five years. The 'Bright Project' of the National Development and Reform Commission will raise 10 billion yuan to promote the application of solar power technology. The total installed capacity of solar power systems nationwide is planned by 2015. Reached 300 megawatts. At present, the core of the third industrial revolution is the new energy revolution. As the key to improving solar energy utilization, high-efficiency solar battery technology represents the direction of advanced technology development and has an important impact on the structural adjustment and sustainable development of my country’s photovoltaic industry. One of the major technologies that should be developed at present. For example, CIGS thin-film solar technology has been listed as a green and environmentally-friendly encouraging project for energy conservation and carbon reduction in the country, and has become one of the key projects supported by the country. The application of solar photovoltaic market is widening and diversified. Photovoltaic products that meet various needs continue to come out. In addition to large-scale grid-connected photovoltaic power stations, photovoltaic power generation systems combined with buildings, small photovoltaic systems, and off-grid photovoltaic systems are also fast Rise. The cost of solar storage batteries and photovoltaic systems continues to decline and approaching the cost of conventional power generation, which is still the subject of the development of the photovoltaic industry, and solar storage batteries will continue to be on the path of high efficiency and low cost. The well-known crystalline silicon cells are divided into single crystal and polycrystalline, the difference lies in the silicon wafers used. Monocrystalline silicon wafers are made by slicing polycrystalline silicon raw materials through a crystal pulling furnace into single crystal rods, and polycrystalline silicon wafers are made of polycrystalline silicon materials that are cast into polycrystalline silicon ingots in an ingot furnace and then sliced. However, it is still polysilicon cells that dominate the photovoltaic market. The basic structure of a solar battery is made by joining P-type and N-type semiconductors. For it, the most important parameter is the photoelectric conversion efficiency. Among the monocrystalline cells, the industrialization level of the N-type monocrystalline cells currently developed is about 21%-24%, the domestic industrialization level of the P-type monocrystalline cells is about 18.7%-19.2%, and overseas is 19.2%. -20% or so. The industrialization level of polycrystalline batteries is around 17%-17.5%.