The basic characteristics of solar cells are the three basic characteristics of the polarity of solar cells, the performance parameters of solar cells, and the volt-ampere characteristics of solar cells. The specific explanation is as follows
1, the polarity of solar cells
Silicon solar cells are generally made of P+/N type structures or N+/P type structures, P+ and N+, which represent the conductivity type of the solar cell front illumination layer semiconductor material; N and P, represent the conductivity type of the back side substrate semiconductor material of the solar cell . The electrical properties of solar cells are related to the properties of the semiconductor materials used to make the cells.
2, solar cell performance parameters
Solar cell performance parameters consist of open-circuit voltage, short-circuit current, maximum output power, fill factor, and conversion efficiency. These parameters are a measure of the performance of solar cells.
3 Volt-ampere characteristics of solar cells
The P-N junction solar cell includes a shallow P-N junction formed on the surface, a stripe-like and finger-shaped front ohmic contact, a backside ohmic contact covering the entire backside surface, and an antireflection layer on the front side. When the cell is exposed to the solar spectrum, photons with energy less than the band gap Eg do not contribute to cell output. Photons with energies larger than the bandgap Eg will contribute energy Eg to the battery output, and energy less than Eg will be consumed as heat. Therefore, in the design and manufacture of solar cells, the effect of this heat on the stability and life of the battery must be considered.