Outdoor basketball court led floodlight solar energy knowledge:

External photoelectric effects are not limited to metals, but can also occur in semiconductors. There are photomultiplier tubes on the market that make semiconductors into photo-electric surfaces. There is also a photoelectric effect inside the semiconductor

When the semiconductor is irradiated with light, if the photon energy exceeds the band gap, the carrier increases and the resistance decreases. This phenomenon is called photoconductivity. If it corresponds to the external photoelectric effect discussed above,

This phenomenon is called the internal photoelectric effect. When the light is dimmed, the street light will automatically light up, and the light control switch uses this principle. However, this effect only changes the size of the resistor, but it cannot obtain energy. If you want to get energy, you need the photovoltaic effect described below.