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shared by emfennelly on 15 Jun 14 - No Cached

with a limited income, most people will choose to take care of their own immediate needs before they address the needs of the planet.
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Between 1977 and 2013, the overall cost associated with solar power dropped an amazing 99%
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dropped 60% since the beginning of 2011
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new materials (such as perovskites) are becoming even cheaper to manufacture, more efficient at converting energy, and could eventually supplant current silicon cells by absorbing only specific wavelengths of light—thus making it possible to “layer” semi-transparent sheets to increase the amount of energy being generated.
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shared by emfennelly on 03 Jun 14 - No Cached

shared by emfennelly on 03 Jun 14 - No Cached

Photovoltaic cells are made of special materials called semiconductors such as silicon,
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when light strikes the cell, a certain portion of it is absorbed within the semiconductor material. This means that the energy of the absorbed light is transferred to the semiconductor. The energy knocks electrons loose, allowing them to flow freely.
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