Difference between revisions of "Photovoltaics"
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A PV cell is the basic unit of a PV array. It is usually made of a [[silicon]] substrate coated with a thin film. These are mounted together with supporting structure to form [[solar_panel|PV panel]].<ref>G.D.J. Harper - ''Domestic solar energy: a guide for the home owner'' 2009. ISBN 978-1-84797-060-2 p. 140</ref> A number of technologies are available, but costs vary widely and increase sharply with high efficiencies. | A PV cell is the basic unit of a PV array. It is usually made of a [[silicon]] substrate coated with a thin film. These are mounted together with supporting structure to form [[solar_panel|PV panel]].<ref>G.D.J. Harper - ''Domestic solar energy: a guide for the home owner'' 2009. ISBN 978-1-84797-060-2 p. 140</ref> A number of technologies are available, but costs vary widely and increase sharply with high efficiencies. | ||
| − | == Technologies == | + | ==Technologies== |
Thin film technologies are generally less expensive than the others, as well as being lighter. Some versions have reached 23% efficiency | Thin film technologies are generally less expensive than the others, as well as being lighter. Some versions have reached 23% efficiency | ||
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Emerging technologies: Perovskite cells may reach over 30% efficiency for very low costs. Still in development. | Emerging technologies: Perovskite cells may reach over 30% efficiency for very low costs. Still in development. | ||
| + | |||
| + | Multijunction cells are over 100 times more expensive than less efficient crystalline silicon cells or thin film cells | ||
==References== | ==References== | ||
Revision as of 15:09, 22 April 2019
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Photovoltaics (or PV) is the generation of electric currents from electromagnetic radiation using the photovoltaic effect (compare solar-thermal electricity).
A PV cell is the basic unit of a PV array. It is usually made of a silicon substrate coated with a thin film. These are mounted together with supporting structure to form PV panel.[1] A number of technologies are available, but costs vary widely and increase sharply with high efficiencies.
Technologies
Thin film technologies are generally less expensive than the others, as well as being lighter. Some versions have reached 23% efficiency
Single junction gallium arsenide up to 28% efficient
Multijunction cells, three and four junction cells have reached about 36% efficiency without concentrators and up to 46% with concentrators.
Crystalline silicon cells, 25-26 %, 22% for commercially available products (2019).
Emerging technologies: Perovskite cells may reach over 30% efficiency for very low costs. Still in development.
Multijunction cells are over 100 times more expensive than less efficient crystalline silicon cells or thin film cells
References
- ↑ G.D.J. Harper - Domestic solar energy: a guide for the home owner 2009. ISBN 978-1-84797-060-2 p. 140
