What do You think, when was started the story of the solar battery? In 1839, Edmond Becquerel discovered the photovoltaic effect — conversion of solar energy into electricity. In about 50 years, Charles Fritz suggested that this effect can be achieved by using the device of the selenium and gold with an efficiency of less than 1%. And implemented the technology for the first time in the 30-ies of XX century Soviet scientists. Americans 1% efficiency was not satisfied, so in 1954 they invented the silicon solar battery, the outstanding 6% efficiency. After 4 years solar energy has become the main source of solar energy in space ships. In the 70-ies of the efficiency reached 10%, however on land use speech and did not go, because the cost of manufacturing solar panels was very large. And only in 1989 was able to achieve an efficiency of 30%. Most solar panels used in Germany – 36%. There is 1 GW of electricity annually, followed by the USA and Spain. Batteries are placed on the roofs of houses, factories, and some even wear hats with solar panels to charge your gadgets. Samsung went ahead and released the world's first netbook solar battery, working time is around 15 hours. And mobile phone battery from Samsung will be able to provide 10 minutes talk time per hour of charging from the sun.