Perovskite solar cell

Luminescent perovskite nanoplatelets hold potential for tunable, efficient LEDs

Dyesol awarded $0.5 million grant to pursue high efficiency, low cost solar cell

Australia-based Dyesol has been awarded a $449,000 grant from the Australian Renewable Energy Agency (ARENA) to commercialize an innovative, very high efficiency perovskite solar cell. ARENA has stated that the funding would enable Dyesol to create a roadmap setting out the steps needed to take its perovskite solar cell technology from the lab to a commercially available product. Dyesol will map out the techniques and requirements for working towards scalable manufacturing of high-quality, uniform perovskite cells that achieve efficiency, durability and stability targets. As declared, Dyesol is initially aiming for a delivery cost benchmark of US 10 cents per kWh, putting perovskite solar PV cells on par with current benchmarks achieved by silicon solar PV. This would be a considerable achievement given silicon PV’s maturity as a technology, and provides…

Researchers at Ludwig Maximilian Univ. of Munich, Germany (LMU) have succeeded in synthesizing perovskite nanocrystals in the form of ultrathin nanoplatelets whose emission characteristics can be tuned by altering their thickness. The resulting nanoplatelets are about 300 times thinner than the perovskite films conventionally used in the fabrication of solar cells.

Despite their large surface area, these platelets emitted an intense blue luminescence, and the properties exhibited by these minuscule particles were deemed inexplicable in the context of classical physics. The scientists state that they can be accounted for only by the laws of quantum physics, as confirmed by theoretical calculations carried out by the team.

Moreover, not only could platelets of varying thickness be produced in a controlled manner by modifying the conditions of their synthesis, these changes also resulted in striking alterations in their optical properties: In fact, the light emitted by the perovskite nanoplatelets was found to depend on their thickness. By adding layers to the crystal lattice, the researchers were able to progressively change the color of the emitted photoluminescence from violet to blue and finally to green.

The team now hopes to extend the tunability of the radiation emitted by their perovskite nanocrystals over the entire visible range and beyond. This would make it possible to manufacture energy-efficient and economical LEDs that radiate light of virtually any desired color, and these novel nanoplatelets are also ideally suited for use in lasers.

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Graphene as a front contact for silicon-perovskite tandem solar cells

Researchers at the Helmholtz-Zentrum Berlin (HZB) developed a process for coating perovskite layers with graphene for the first time, so that the graphene acts as a front contact. A traditional silicon absorber converts the red portion of the solar spectrum very effectively into electrical energy, whereas the blue portions are partially lost as heat. To reduce this loss, the silicon cell can be combined with an additional solar cell that primarily converts the blue portions and a particularly effective complement to conventional silicon is perovskite. However, it is normally very difficult to provide the perovskite layer with a transparent front contact. While sputter deposition of indium tin oxide (ITO) is common practice for inorganic silicon solar cells, this technique destroys the organic components of a perovskite cell. The HZB scientists…

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