8/2/2023 0 Comments Placa solar de silicio![]() 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 Pakistan receives one of the best solar irradiation in the world and has a potential to generate over 2.324 million megawatts (MW) of electricity per annum through the solar thermal and photovoltaic systems.Calvin S. ![]() As per the available data, although Pakistan has the capacity to add 15,000MW to the national grid by 2025, still 25 percent of the population does not have access to electricity, leaving almost 58 million population without power. Recently, the country’s energy demand has increased manifold because of rapid population growth and other factors. To achieve the set target, it is mandatory that such steps should be taken which help build the energy infrastructure mainly for renewable energy technologies in the country. It is to be mentioned that as per the SDG Goal 7, affordable, reliable and modern energy for all must be ensured by 2030. Pakistan’s power demand is expected to reach 108–126 million tons of oil equivalent (TOE) by 2030. He said the plan was to shift the existing power units to solar energy during day time instead of using costly imported fuel. Utilizing solar energy will also help reduce conventional fuel consumption and cost 50-60 percent less than fossil fuel. Jaffri said the project was aimed at reducing the country’s reliance on expensive imported fuel. “The bidding process has been initiated and the project is expected to be completed in next 2.5 years under the Fast Track Solar Initiative to generate 600 megawatts,’’ he said. He was of view that the time had come to take the power sector towards more decarbonization. The project is part of the government’s efforts to save energy and utilize indigenous renewable energy resources. Taking to WealthPK, Director of Policy at Alternative Energy Development Board (AEDB) Syed Aqeel Hussain Jaffri said Pakistan’s energy sector remained one of the main obstacles to economic growth. To tackle the current economic and energy crisis, as both are interlinked, the government has prioritized solarization, as opting for renewable energy sources offers better economic alternatives. ![]() ![]() ISLAMABAD-Moving towards clean and cheap energy adoption, the government is all set to launch a 600-megawatt solar power project in Muzaffargarh. ![]()
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