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Promising discoveries could lead to a better, cheaper solar cell



  A promising discovery could lead to a better, cheaper solar cell.
Credit: McGill University

McGill University researchers have gained new insights into the properties of perovskites, one of the world's most promising materials, to produce a more efficient, robust and cost-effective solar cell.

In a study published today in Nature Communications researchers used a multi-dimensional electronic spectrometer (MDES) ̵

1; a unique instrument handcrafted at McGill – to study the behavior of electrons in cesium lead. Iodide to observe perovskite nanocrystals. The MDES, which made these observations possible, is able to measure the behavior of electrons over extremely short periods of time – up to 10 femtoseconds or 10 millionths of a billionth of a second. Perovskites are seemingly solid crystals, which became known in 2014 for the first time for their unusual promise in future solar cells, which could be cheaper or more defect tolerant.

A Most Exciting Discovery

"It's the Most Exciting Outcome I've Ever attended" Lead author and McGill chemistry professor Patanjali Kambhampati reported on the discovery of the liquid-solid duality of perovskite. "Instead of looking for perfection in defect-free silicon microelectronics, we have a flawed thing here that is defect-tolerant, and now we know a bit more about why that is."

Solids work like liquids

How the researchers Looking at the crystals with the MDES, they challenged our traditional understanding of the difference between liquids and solids.

"Since childhood, we have learned of solids from Differentiating fluids based on intuition: We know solids as a solid form, while liquids take on the shape of their container, "said Hélène Seiler, senior author of the study and former graduate student. Student at the Faculty of Chemistry at McGill, currently at the Faculty of Physical Chemistry, Fritz Haber Institute at the Max Planck Institute. "But if we look at what the electrons in this material are actually doing in response to light, we find that they behave the way they normally do in a liquid, they are clearly not in a liquid – they are The difference between a solid and a liquid is that atoms or molecules dance in a liquid, whereas in a solid the atoms or molecules in the space are more solid than in space a grid. "


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Further information:
Hélène Seiler et al. Two-dimensional electronic spectroscopy shows liquid-like line-form dynamics in CsPbI3 perovskite nanocrystals, Nature Communications (2019). DOI: 10.1038 / s41467-019-12830-1

Provided by
McGill University




Quote :
Promising discovery could lead to a better, cheaper solar cell (2019, October 31)
retrieved on November 1, 2019
from https://phys.org/news/2019-10-discovery-cheaper-solar-cell.html

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