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Revision as of 16:30, 29 January 2011
Photovoltaics (PV) is a method of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the photovoltaic effect. Photovoltaic power generation employs solar panels comprising a number of cells containing a photovoltaic material. Materials presently used for photovoltaics include monocrystalline silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper indium selenide/sulfide.[1] Due to the growing demand for renewable energy sources, the manufacturing of solar cells and photovoltaic arrays has advanced considerably in recent years.[2][3][4]
As of 2010, solar photovoltaics generates electricity in more than 100 countries and, while yet comprising a tiny fraction of the 4.8 TW total global power-generating capacity from all sources, is the fastest growing power-generation technology in the world. Between 2004 and 2009, grid-connected PV capacity increased at an annual average rate of 60 percent, to some 21 GW.[5] Such installations may be ground-mounted (and sometimes integrated with farming and grazing)[6] or built into the roof or walls of a building, known as Building Integrated Photovoltaics or BIPV for short.[7] Off-grid PV accounts for an additional 3–4 GW.[5]
Driven by advances in technology and increases in manufacturing scale and sophistication, the cost of photovoltaics has declined steadily since the first solar cells were manufactured.[8] Net metering and financial incentives, such as preferential feed-in tariffs for solar-generated electricity, have supported solar PV installations in many countries.
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Footnotes
- ↑ Cite error: Invalid
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- ↑ German PV market
- ↑ BP Solar to Expand Its Solar Cell Plants in Spain and India
- ↑ Large-Scale, Cheap Solar Electricity
- ↑ 5.0 5.1 REN21. Renewables 2010 Global Status Report p. 19.
- ↑ GE Invests, Delivers One of World's Largest Solar Power Plants
- ↑ Building integrated photovoltaics
- ↑ Richard M. Swanson. Photovoltaics Power Up, Science, Vol. 324, 15 May 2009, p. 891.