Research progress and development trend of the hot

Research progress and development trend of semiconductor photovoltaic devices

as we all know, fossil energy is increasingly restricted, mainly due to pollution. In addition, its cost is slowly rising. Therefore, we really need to make great contributions to clean energy, especially photovoltaic industry. As we know, the current photovoltaic industry has reached the stage of Optoelectronics that can be basically applied. The development of the photovoltaic industry has benefited from optoelectronic conversion. The core of optoelectronic conversion is optoelectronic devices. The technical threshold of the diaphragm industry is still very high. When it comes to optoelectronic devices, it is mainly the ionic nature of light, which has laid an important foundation for today's optoelectronic conversion and photovoltaic industry. Therefore, it has won the 2018 Nobel Prize

when it comes to photovoltaic industry, we should talk about solar cells. The single, double and four chip solar cells based on gallium arsenide are about 32% to 34% of the conversion efficiency. Silicon solar cells are the most commonly used solar cells and many materials of emerging solar cells. Therefore, we should pay more attention to new types of solar cells with new materials on the basis of focusing on traditional gallium arsenide based high-efficiency solar cells and industrialized silicon solar cells

in terms of silicon solar cells, there are mainly two structures. The first structure is back metallization, that is, the solar cells we make now. In addition to the sheet junctions, which are the areas where solar cells are generated, we also have a large number of metal lines. These metal lines occupy a large area of the surface, which will have a certain impact on the efficiency. If we put these lines behind the silicon wafer, At the time of installation, the back can be directly attached to the installed board. At the same time, all the surface areas are reserved, and all the front areas are reserved. As the receiving layer of solar energy, the efficiency per unit area is improved

the second is the technology of restraining junctions, which continuously improves the luminous efficiency of solar cells. The current technology of restraining junctions has an efficiency of 23% 3. All class I and II pipe systems and steam pipes, water supply pipes, compressed air pipes and design pressure greater than 0 The efficiency of the 35 MPa fuel pipe is about 25% after the manufacturing is completed and before the thermal insulation material is wrapped or coated. From the perspective of efficiency, the structural efficiency of the restraining structure is high. The fault isolation method does not need the same type of equipment or spare parts for comparison. Through theoretical calculation, if the laboratory structure is well done, its efficiency can reach 27.5%. Therefore, there is still a considerable growth point compared with the current 10% to 20%

there is another important development. If silicon is done well, both sides can be used as solar cells. It is estimated that by about 2028, the proportion of our double-sided solar cells may be close to 40%. The other is the silicon solar cell or gallium arsenide. Several cells can be stacked together. This is an important direction of future development. The stacking will greatly improve the efficiency of the whole solar cell

perovskite materials related to new materials for solar cells are a hot research topic all over the world. At present, the efficiency of perovskite has exceeded 22% and is still improving

another very important development is the use of silicon. There are two ways to stack silicon's existing solar cells and perovskite. One is to bond the thin film with its direct force swing rod in the rising process, and the other is to directly grow perovskite on silicon solar cells. Both structures can be used. It is expected that the number of stacked silicon-based cells will continue to increase by 2025, From single section to multi section, continuously improve efficiency and reduce costs

on June 25, the perovskite company announced that with the latest laminated structure, the efficiency was 27.3%, which has exceeded the world record of 26.7% for a single silicon solar cell

in short, on the one hand, we should pay attention to the development of new structures and new materials of silicon solar cells, and at the same time, we should also pay attention to the combination with other solar cells, so as to promote the continuous development of the entire photovoltaic industry under the condition of low cost and high luminous efficiency