Definition
A photovoltaic cell, also known as a solar cell, is a device that converts light energy directly into electrical energy through the photovoltaic effect. These cells are the building blocks of solar panels, which are used to harness solar energy.
Etymology
The term "photovoltaic" comes from the Greek word "photo," meaning light, and "voltaic," from the name Alessandro Volta, an Italian physicist known for his pioneering work in electricity. Thus, photovoltaic essentially means "light-electricity."
Example usage
'The rooftop solar installation uses advanced photovoltaic cell technology to generate clean energy for the entire building.'
Interesting fact
The first practical photovoltaic cell was created in 1954 by Bell Laboratories and had an efficiency of just 6%. Modern solar cells have efficiencies exceeding 20% in commercial products and even higher in laboratory settings.
Source: National Renewable Energy Laboratory (NREL)
Explanation and detail
How it works
Photovoltaic cells work by allowing photons, or particles of light, to knock electrons free from atoms, generating a flow of electricity. This process occurs in semiconductor materials, typically silicon, used in the cell.
Structure
A typical photovoltaic cell is composed of two layers of silicon. One layer is doped with phosphorus, giving it an excess of electrons, while the other is doped with boron, creating a deficit of electrons. This creates an electric field at the junction of the two layers.
Applications
Photovoltaic cells are used in a wide range of applications, from small-scale uses like calculators and watches to large-scale installations such as solar farms and power plants. They are a crucial technology in the transition to renewable energy sources.
Related video
