The photovoltaic effect is the creation of electric voltage or electric current in a material upon exposure to light. This phenomenon is the foundational principle behind photovoltaic cells, commonly known as solar cells, which are used to convert sunlight into electricity. Here's a more detailed explanation: 1. **Material Properties**: The photovoltaic effect occurs in certain materials, typically semiconductors, such as silicon. These materials have a band gap that allows them to absorb photons (light particles) with sufficient energy.
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The photovoltaic effect is the production of an electric potential difference or an electric current by photon absorption in a material or device. In a semiconductor, absorbed photons generate electrons and electron holes; asymmetric transport and selective collection can maintain distinct quasi-Fermi levels and deliver electrical power to a load. An equilibrium built-in potential alone supplies no continuous electrical power.