Perovskites enable quantum dots for displays, lasers and solar cells
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…
Scientists at Nanjing University of Science and Technology, China, and colleagues have used quantum dots based on perovskites for QD-based light-emitting devices (QLEDs). These (completely inorganic) materials reportedly solve the stability problem of previously developed hybrid organicé¥ænorganic halide perovskites.
Quantum dots (QDs) are nanometer-sized semiconductor materials with highly tunable properties such as bandgap, emission color, and absorption spectrum. These characteristics depend on their size and shape, which can be controlled during the synthesis. The quantum dots’ luminescence wavelength can be tuned by both their size and by the halide ratio. In this research, the team made blue, green, and yellow QLEDs with high quantum yields, using the perovskite quantum dots as the emitting layer. The researchers state that this development could allow the design of new optoelectronic devices, such as displays, photodetectors, solar cells, and 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…