photovoltaics tagged posts

Building Blocks of the Future for Photovoltaics

Artistic representation showing the twisted layers of tungsten diselenide (top) and molybdenum disulphide (bottom). Following excitation using light, a multitude of optically “dark” excitons form between the layers. These “dark” excitons are electron-hole pairs bound by Coulomb interaction (light and dark spheres connected by field lines), which cannot be directly observed using visible light. One of the most interesting quasiparticles is the “moiré interlayer exciton” – shown in the middle of the image – in which the hole is located in one layer and the electron in the other...
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Flexible All-Perovskite Tandem Solar Cells with a 24.7% Efficiency

Lightweight and flexible perovskites are highly promising materials for the fabrication of photovoltaics. So far, however, their highest reported efficiencies have been around 20%, which is considerably lower than those of rigid perovskites (25.7%).

Researchers at Nanjing University, Jilin University, Shanghai Tech University, and East China Normal University have recently introduced a new strategy to develop more efficient solar cells based on flexible perovskites. This strategy, introduced in a paper published in Nature Energy, entails the use of two hole-selective molecules based on carbazole cores and phosphonic acid anchoring groups to bridge the perovskite with a low temperature-processed NiO nanocrystal film.

“We believe that lightweight flexible perovskite solar cells ar...

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Charging Electric Vehicles with Photovoltaics at Home

Exemplary week of a single user showing the usage of the BEV as well as the energy production by rooftop PV. In this recorded charging pattern (i.e., the baseline scenario, as explained below), it would be beneficial to not immediately recharge the car to the maximum, but instead wait for periods of increased PV energy generation. Credit: DOI: 10.1016/j.rser.2021.111969

An electric car that runs on PV power sounds appealing. But is it really possible to enjoy flexibility with a vehicle charged through a home photovoltaic system? An ETH research team has reached some surprising conclusions.

The area of photovoltaics (PV) is rapidly increasing in popularity, and in Switzerland it already covers 5 percent of the country’s electricity consumption...

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Twisting 2D materials uncovers their superpowers

three different interlayer twist angles and their subsequent crystalline symmetry
The twist angle between the layers governs the crystal symmetry and can lead to a variety of interesting physical behaviours, such as unconventional superconductivity, tunnelling conductance, nonlinear optics and structural super-lubricity.

Researchers can now grow twistronic material at sizes large enough to be useful. While an exciting potential area of nanotechnology, twistronics until now has mostly been explored on samples smaller than human hairs. Now researchers can produce samples on the centimetre scale.

2D materials, which consist of a single layer of atoms, have attracted a lot of attention since the isolation of graphene in 2004...

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