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In page Perovskite solar cell:

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In 2021, many solar cells implemented in the year 2000 are nearing their end-of-life stage. As such, research into perovskite recycling is crucial. One tricky component of perovskites to recycle is lead. Currently, producing 1 GW of energy using the most efficient perovskite solar cell would result in 3.5 tons of lead waste. The main strategy used right now to mitigate lead contamination is in-operation of the solar cell. Lead absorbing P,P’-di(2-ethylhexyl)methanediphosphonic acid and sulfonic acid cation-exchange resin are used to prevent lead leaking from any damage the solar panels may incur during use 195.[citation needed]