{"id":79735,"date":"2020-10-01T21:00:08","date_gmt":"2020-10-01T18:00:08","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/chemical-innovation-stabilizes-best-performing-perovskite-formulation\/"},"modified":"2020-10-01T21:00:08","modified_gmt":"2020-10-01T18:00:08","slug":"chemical-innovation-stabilizes-best-performing-perovskite-formulation","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/chemical-innovation-stabilizes-best-performing-perovskite-formulation\/","title":{"rendered":"#Chemical innovation stabilizes best-performing perovskite formulation"},"content":{"rendered":"

“#Chemical innovation stabilizes best-performing perovskite formulation<\/strong>”<\/p>\n

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\n Publishing in Science<\/a><\/i>, researchers at EPFL have successfully overcome a limiting problem with stabilizing the best-performing formulation of metal-halide perovskite films, a key player in a range of app<\/a>lications, including solar cells. Credit: Nripan Mathews NTU, Singapore
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Perovskites are a class of materials made up of organic materials bound to a metal. Their fascinating structure and properties have propelled perovskites into the forefront of materials’ research, where they are studied for use in a wide range of applications. Metal-halide perovskites are especially popular, and are being considered for use in solar cells, LED lights, lasers, and photodetectors.<\/p>\n


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For example, the power-conversion efficiency of perovskite solar cells (PSCs) have increased from 3.8% to 25.5% in only ten years, surpassing other thin-film solar cells\u2014including the market-leading, polycrystalline silicon.<\/p>\n

Perovskites are usually made by mixing and layering various materials together on a transparent conducting substrate., which produces thin, lightweight films. The process, known as “chemical deposition,” is sustainable and relatively cost-effective.<\/p>\n

But there is a problem. Since 2014, metal halide perovskites have been made by mixing cations or halides with formamidinium (FAPbI3<\/sub>). The reason is that this recipe results in high power-conversion efficiency in perovskite solar cells. But at the same time, the most stable phase of FAPbI3 is photoinactive, meaning that it does not react to light\u2014the opposite of what a solar power harvester ought to do. In addition, solar cells made with FAPbI3 show long-term stability issues.<\/p>\n

Now, researchers led by Michael Gr\u00e4tzel and Anders Hafgeldt at EPFL, have developed a deposition method that overcomes the formamidinium issues while maintaining the high conversion of perovskite solar cells. The work has been published in Science<\/i>.<\/p>\n

In the new method, the materials are first treated with a vapor of methylammonium thiocyanate (MASCN) or formamidinium thiocyanate FASCN. This innovative tweak turns the photoinactive FAPbI3<\/sub> perovskite films to the desired photosensitive ones.<\/p>\n

The scientists used the new FAPbI3<\/sub> films to make perovskite solar cells. The cells showed more than 23% power-conversion efficiency and long-term operational and thermal stability. They also featured low (330 mV) open-circuit voltage loss and a low (0.75 V) turn-on voltage of electroluminescence.<\/p>\n\n

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A way to increase structural stability in strained halide perovskites\n <\/p><\/div>\n

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\n More information:<\/strong>
\n “Vapor-assisted deposition of highly efficient, stable black-phase FAPbI3<\/sub> perovskite solar cells” Science<\/i> (2020). science.sciencemag.org\/cgi\/doi \u2026 1126\/science.abb8985<\/a><\/p><\/div>\n
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\n Ecole Polytechnique Federale de Lausanne
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Citation<\/strong>:
\n Chemical innovation stabilizes best-performing perovskite formulation (2020, October 1)
\n retrieved 1 October 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-10-chemical-stabilizes-best-performing-perovskite.html<\/p>\n

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