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Solarcell corp1/4/2024 Ohl had inadvertently made a p-n junction, the basis of a solar cell. This crack, which had probably formed when the sample was made, actually marked the boundary between regions containing different levels of impurities, so one side was positively doped and the other side negatively doped. He noticed that in this particular sample, current flowed through this sample when it was exposed to light. He had been investigating some silicon samples, one of which had a crack in the middle. The next major advance in solar cell technology was made in 1940 by Russell Shoemaker Ohl, a semiconductor researcher at Bell Labs. Some research on selenium photovoltaics continued for the next several decades, and a few applications were found, but they were not put to widespread use. Though Fritts had hoped his solar cells might compete with Edison’s coal-fired power plants, they were less than one percent efficient at converting sunlight to electricity and thus not very practical. In 1883, American inventor Charles Fritts made the first solar cells from selenium. Several decades later, in 1873, Willoughby Smith, an English engineer, discovered the photoconductivity of selenium while testing materials for underwater telegraph cables. French physicist Alexandre-Edmond Becquerel, son of physicist Antoine Cesar Becquerel and father of physicist Henri Becquerel, was working with metal electrodes in an electrolyte solution when he noticed that small electric currents were produced when the metals were exposed to light, but he couldn’t explain the effect. The story of solar cells goes back to an early observation of the photovoltaic effect in 1839. In April, 1954, researchers at Bell Laboratories demonstrated the first practical silicon solar cell. Solar cells, which convert sunlight into electrical current, had their beginnings more than a hundred years ago, though early solar cells were too inefficient to be of much use. Fuller at work diffusing boron into silicon to create the world's first solar cell
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