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Understanding why cesium and rubidium salt improve the yield of perovskite solar cells

The discovery, made by a research team led by scientists from the University of California San Diego and MIT, could rapidly advance work to identify the perfect mix of compounds and elements in a perovskite layer for use in solar cells. Until now, researchers have been limited to trial and error in identifying the solar power potential of new perovskites, which have a three-part crystal structure composed of three from a long list of candidate materials. “We found that uniformity in the chemistry and structure is what helps a perovskite solar cell operate at its fullest potential,” said research coordinator David Fenning. ” Rubidium and cesium, the scientists added, improve cell performance in relation to microscopic inactive “dead zones” in perovskite cells – which suck in and retain electrons from other regions, resulting in loss of current and voltage which is detrimental for device yield. As recent research has demonstrated, the number of chemicals and materials being used to improve performance of perovskite solar devices has constantly increased.

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