Concentrator photovoltaics solar energy is a kind of solar power generation technology that uses optical elements such as lens or mirror to concentrate a large area of sunlight on a small area, and then make further use of it to generate electricity. What is high concentrator photovoltaics? Its basic principle is very simple, that is, a magnifying glass. By concentrating the sunlight to one point and using high-efficiency batteries, the photoelectric conversion rate can be improved, the usage of semiconductor batteries can be reduced, and the cost can be reduced. The so-called III-V compound semiconductors refer to the compound semiconductors formed by the combination of group III and group V elements in the periodic table of elements, mainly including arsenic gallide (GaAs), indium phosphide (INP) and gallium nitride. HCPV is high concentrator photovoltaics energy, high concentration solar energy (HCPV) and concentration solar energy (CPV) technology is to focus a certain area of sunlight through the concentration system to converge in a narrow area (focal spot). Solar cells only need the size of focal spot area, so as to greatly reduce the consumption of solar cells.
Known as the third-generation photovoltaic technology, high-power concentrator photovoltaics power generation technology uses high-efficiency multi junction three five group solar cells, and the photoelectric conversion efficiency has reached 41%%, theoretically up to 70%. Multi junction three five solar cells, also known as gallium arsenide cells, are the solar cells with the highest photoelectric conversion efficiency, which is twice as high as that of crystalline silicon technology, and also have the greatest potential for efficiency growth. Because its price is very expensive, it was first used in the space field to provide energy for satellites and space stations, so it is difficult to popularize the use on the ground. However, because the conversion efficiency of this kind of battery can be improved with the increase of the concentration multiple, a high efficiency power generation system can be obtained at a low cost by combining the low-cost concentration optical system with the battery. Due to the high conversion efficiency of concentrating solar cells, on the one hand, it can reduce the cost of photovoltaic power generation, but also can greatly reduce the construction land of photovoltaic power station; Therefore, it is also the most promising photovoltaic technology to be used in large-scale photovoltaic power plants to reduce the cost of power generation to a level that can compete with the cost of coal power.
1.Generation conversion efficiency = output power / (input power density x chip light transmission area)
2.The calculation method of geometric focusing power is to divide the area of the focusing lens by the size of the chip.
3.The current ratio is calculated by dividing the short-circuit current under concentrated light by the short-circuit current without concentrated light.