Ip65 led floodlight solar cell knowledge: metal photoelectric effect can not be applied to solar cells

If a high voltage is not applied, the phenomenon that the photocurrent is generated by light, that is, the famous photoelectric effect (external photoelectric effect and internal photoelectric effect), is widely used in the light sensor, but the phenomenon itself cannot be used only from the light. Get energy in.

Metal also has a photoelectric effect

In a photocell, a metal sheet (photoelectric surface) placed in a vacuum is irradiated with light. When a high voltage is applied to the anode, if the energy of the light exceeds the work function of the metal, the photoelectron is released, thereby generating an electric current. Known as the external photoelectric effect, it is known as Einstein's experiment of discovering light quantum. High-sensitivity light sensor fabricated using this principle,

The photomultiplier tube was used to discover high-energy particles from space using this principle in the Shengang area of Feizheng City, Jixian County. However, the photomultiplier tube uses high voltage to excite photoelectrons. It must increase the amount of electrons by high voltage, so that the power supply becomes indispensable and therefore cannot be applied to solar cells.