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£2.2m to investigate perovskite atomic structures

Warwick University to use new NMR spectrometer to understand how to increase lifespan and durability of perovskite solar cells

The European Research Council (ERC) has approved a five-year study which will delve into the atomic-level structure of metal halide perovskite compounds to address issues including stability and lifespan, which decrease in high humidity, strong sunlight and at elevated temperatures. The research will be led by Dominik J. Kubicki, an assistant professor in the Department of Physics, University of Warwick.

Using Nuclear Magnetic Resonance (NMR– an analytical chemistry technique that harnesses high magnetic fields and radiofrequencies targeted at atomic nuclei) scientists hope to answer an enduring question: what is causing this type of solar cell material to degrade at the atomic level?

The ERC Starting Grant of £2.2m will involve the purchase of a 400 MHz solid-state NMR spectrometer worth £0.9m, with unique capabilities that are currently not available in West Midlands. It will be installed specifically for this project, enabling researchers to investigate the atomic-level structure of solar cells. The eventual aim is to help improve the durability of these devices, so they can be relied on for decades to come.

While the properties of perovskite solar cells change in a range of atmospheric conditions, they remain remarkably stable outside the Earth's atmosphere. This points to the potential for harvesting energy in space – a topical area of research, after the European Space Agency revealed it would be investigating whether satellites could beam electricity back to Earth earlier this year.

What has already struck scientists is the viability of these new solar cells in applications where currently used silicon solar cells fall short: indoor light harvesting, use on highly flexible substrates, such as foils and fabrics, and in windows which require the material to be partially transparent.

Kubicki said: “This study will help diversify sustainable energy sources and explore more options in the quest to reduce reliance on fossil fuels. We’re keen to understand more about why these solar cells degrade in different atmospheric conditions at the atomic level, so we can design new, better materials and ensure maximum efficiency of this new sustainable energy source."

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