Concentrated pv solar cell are defined as the basic photovoltaic devices used in concentrating conditions. Concentrating solar cells are known for their high conversion efficiency and low cost. They are called the third generation solar cells and are also the frontier of current exploration and research.
Concentrating technology is an effective measure to reduce the total cost of solar cells. The concentrated pv solar cell is placed on the spot or light band to increase the light intensity and overcome the defect of low solar radiation energy flux density, so as to obtain more power output.
Concentrated pv solar cell can directly convert solar energy into electricity by photovoltaic effect, which is the core component of photovoltaic power generation system. Generally speaking, solar cells can be divided into ordinary flat panel photovoltaic solar cells and concentrated pv solar cells. The biggest difference between concentrating solar cells and ordinary flat panel photovoltaic solar cells is the irradiance incident on the solar cells. The incident irradiance of ordinary flat panel photovoltaic solar cells is usually one sun (1 x = 1 000 w / m2), while the incident irradiance of concentrating solar cells is x sun (x > 1), so the current generated by concentrated pv solar cells per unit area is larger than that of ordinary flat panel photovoltaic solar cells.
The concentrated pv solar cell is known for its high conversion efficiency and low cost. It is called the third generation solar cell, and it is also explored and researched. However, due to the influence of surface recombination, the conversion efficiency of the concentrated silicon cell has not been improved in recent years. But the efficiency of the mass collection has exceeded 20%, which creates the conditions for the development of low and medium-sized photovoltaic system. The efficiency of the multi junction cells is higher than any other solar cells in the process of solar light conversion to electricity. The efficiency of the three junction cell in the laboratory has reached 44.4%. The past experience shows that the laboratory concentrated pv solar cell can be changed into commodity in 2-3 years. It is expected that the concentrated four or five junction batteries will soon achieve 50% efficiency. In order to develop a high efficiency multi-junction cell, to understand the mechanism of the loss of efficiency, to reduce the defects of the concentrated pv solar cell structure, it is very important to master the way to realize the super efficient multi junction concentrated pv solar cell.