vps私人国产一级毛片影院_双腿中间触一下就流水漫画_欧美gay无套粗大_老子影院午夜伦手机电影

1. Polarity of solar cells

Generally, silicon solar cells are made into P+/N type structure or N+/P type structure, P+ and N+, which represent the type of electrical conduction of the semiconductor material of solar cells positive light layer. N and P represent the conductive type of the semiconductor material on the back of the solar cell. The electrical properties of solar cells depend on the properties of the semiconductor materials used to make them.

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 and conversion efficiency. These parameters are a good indicator of the performance of solar cells.

3 the volt-ampere characteristic of solar cells

The p-n junction solar cell contains a shallow p-n junction formed on the surface, a strip and finger-like frontal ohm contact, an ohm contact covering the entire back surface and a layer of anti-reflection layer on the front. When the battery is exposed to the solar spectrum, photons with energy less than the gap width of Eg do not contribute to the battery's output. A photon greater than the gap width of Eg will contribute to the battery's output, while a photon less than Eg will be consumed in the form of heat. Therefore, in the design and manufacture of solar cells, the influence of this part of heat on the stability and life of the cells must be considered.