The secret of the tennis court led floodlight solar panels:

The effective state density and distribution function of the solar panel are explained, the electrons are filled with the valence band, and the outermost conduction band is empty.

Starting from absolute zero, as the temperature rises, electrons can transition to the conduction band, and vacancies can also occur on the valence band.

The above changes show that "electronics have thermal energy that will transition from the valence band to the conduction band." In other words, the main thermal energy is provided by k7, and the heat energy at room temperature (298K) is about 25 meV. This band gap E is a very small value. Therefore, the intrinsic semiconductor downloading flux density n at room temperature will become very low.