1. Polarity of solar cells
Silicon solar cells are generally made into p+/n structure or n+/p structure, p+ and n+, indicating the conductive type of semiconductor material in the front lighting layer of solar cells; N and P, indicating the conductive type of the semiconductor material on the back of the solar cell. The electrical performance of solar cells is related to the characteristics of semiconductor materials used in the manufacture of solar cells.
2. Performance parameters of solar cells
The performance parameters of solar cells are composed of open circuit voltage, short circuit current, maximum output power, filling factor, conversion efficiency, etc. These parameters are the indicators to measure the performance of solar cells.
3 volt ampere characteristics of solar cells
The p-n junction solar cell consists of a shallow p-n junction formed on the surface, a strip and finger shaped front ohmic contact, a back ohmic contact covering the entire back surface, and an anti reflective layer on the front. When the cell is exposed to the solar spectrum, photons with energy less than the band gap eg do not contribute to the cell output. Photons with energy greater than the band gap width eg will contribute energy eg to the battery output, and energy less than EG will be consumed in the form of heat. Therefore, the influence of this part of heat on the stability and life of solar cells must be considered in the design and manufacturing process of solar cells.
