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Nanostructures assist in some ways — ScienceDaily


By the top of 2021, groups at HZB had introduced perovskite silicon tandem photo voltaic cells with an effectivity near 30 p.c. This worth was a world file for eight months, a very long time for this hotly contested area of analysis. Within the famend journal Nature Nanotechnology, the scientists describe how they achieved this file worth with nanooptical structuring and reflective coatings.

Tandem photo voltaic cells made from perovskite and silicon allow considerably increased efficiencies than silicon photo voltaic cells alone. Tandem cells from HZB have already achieved a number of world data. Most not too long ago, in November 2021, HZB analysis groups achieved an authorized effectivity of 29.8 % with a tandem cell made from perovskite and silicon. This was an absolute world file that stood unbeaten on the high for eight months. It was not till the summer season of 2022 {that a} Swiss workforce at EPFL succeeded in surpassing this worth.

Three HZB groups had labored carefully collectively for the record-breaking tandem cell. Now they current the main points in Nature Nanotechnology. The journal additionally invited them to put in writing a analysis briefing, during which they summarise their work and provides an outlook on future developments.

Textures improves the efficiency

“Our competences complement one another very effectively,” says Prof. Dr. Christiane Becker, who developed the world file cell with the workforce led by Dr. Bernd Stannowski (silicon backside cell) and Prof. Dr. Steve Albrecht (perovskite high cell). Becker’s workforce launched a nanooptical construction into the tandem cell: a gently corrugated nanotexture on the silicon floor. “Most shocking, this texture brings a number of benefits directly: it reduces reflection losses and ensures a extra common perovskite movie formation,” says Becker. As well as, a dielectric buffer layer on the again of the silicon reduces parasitic absorption at near-infrared wavelengths.

As a conclusion, the researchers maintain: customised nanotextures can assist to enhance perowskite semiconductor supplies on numerous ranges. These outcomes should not solely invaluable for tandem photo voltaic cells made from perovskite and silicon, but additionally for perovskite-based light-emitting diodes.

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Supplies supplied by Helmholtz-Zentrum Berlin für Materialien und Energie. Notice: Content material could also be edited for model and size.

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