The silicon light battery in solar street lights is a semiconductor device that directly converts light into electrical energy. Its structure is simple, and the core part is a large area of PN knots (below). You can do a simple experiment by yourself, and connect the point contact diode of a transparent glass case with a micro -safety table to a closed circuit. When the diode's core (PN knot) is illuminated, you will see Wei'an The table of the table is biased, showing a current in the circuit. This phenomenon is called the photovoltaic effect.

The PN nodular area of the silicon light battery is much larger than the PN of the diode, so the electromotive force and current generated during light are much larger. For example, the domestic 2CR silicon light battery is strong at 100MW/CM2. The opening voltage (measurement with high internal resistance with high internal resistance) is 450-600mV, short -circuit current is 16-30mA, and the conversion efficiency is 6%~ 12%.