Solar cells, or photovoltaic (PV) cells, are the building blocks of every solar panel. But have you ever wondered how a slice of silicon can turn sunlight into electricity? The process is a marvel of modern materials science and high-precision manufacturing.
From Sand to Silicon
It all starts with quartz sand. This sand is melted at extremely high temperatures to produce 99.9999% pure silicon. This silicon is then grown into large ingots, which are sliced into paper-thin wafers. These wafers are the foundation of the solar cell.
The P-N Junction
To make electricity flow, we create an imbalance. One side of the silicon wafer is treated with phosphorus (creating a negative charge), and the other with boron (creating a positive charge). When sunlight hits this "P-N Junction," it knocks electrons loose, creating a flow of current.