十万个为什么·科学启蒙30篇（2）

20 / 30

太阳能电池板如何把阳光变成电？

Solar panels contain many silicon-based photovoltaic cells that absorb sunlight.
When photons hit these cells, they knock electrons loose from their atoms.
This movement of free electrons creates an electric current inside the cell.
Metal contacts on the top and bottom of each cell collect this current for use.
An inverter then changes the direct current (DC) into alternating current (AC) for homes.
Efficiency depends on light intensity, panel angle, and how clean the surface is.
Even on cloudy days, panels still generate some electricity—just less than in full sun.
Newer panels use multiple layers to capture different light wavelengths more effectively.
They produce no emissions while operating, making them vital for clean energy goals.
Regular maintenance and smart placement help maximize long-term power output.