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Published in:
2018 | OriginalPaper | Chapter
2. Conceptual Framework
Authors : Andrés Julián Aristizábal Cardona, Carlos Arturo Páez Chica, Daniel Hernán Ospina Barragán
Published in: Building-Integrated Photovoltaic Systems (BIPVS)
Publisher: Springer International Publishing
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Abstract
Solar energy is transformed directly into electricity by photovoltaic cells. This process is based on the application of the photovoltaic effect, which occurs when light hits on materials called semiconductors. Light is composed of photons, which are energetic particles. These photons are of different energies corresponding to the different wavelengths of the solar spectrum. When photons strike a photovoltaic cell, they can be reflected or absorbed, or can pass through it. Only the absorbed photons can generate electricity. When a photon is absorbed, the photon energy is transferred to an electron of an atom of the cell. With this new energy, the electron is able to escape its normal position associated with an atom to form part of a current in an electric circuit [1].