Perovskite solar cell

EPFL researchers working towards a perovskite material that turns light and X-rays into electricity

Scientists tackle heat loss problem by deploying hot-carrier technology in perovskite solar cells

Researchers at the National Renewable Energy Laboratory (NREL) announced that they have figured out a pathway for dealing with the heat loss problem by deploying hot-carrier technology in perovskite solar cells. Hot carrier solar cells offer simplicity of design, low cost, and high efficiency, but are a long way from being commercialized, as one big challenge is revving up the kinetic energy transfer in order to prevent energy loss. This recent study provides a pathway for pushing perovskite levels upwards, possibly as high as 66%. It determines that charge carriers created by absorbing sunlight by the perovskite cells encounter a bottleneck where phonons (heat carrying particles) that are emitted while the charge carriers cool cannot decay quickly enough. Instead, the phonons re-heat the charge carriers, thereby drastically slowing the cooling…

Researchers at the Swiss EPFL are working on developing a perovskite-based material that can convert light and X-rays into electricity and holds great potential for use in photovoltaics as well as space exploration.

The scientists have chosen to use methylammonium lead iodide (CH3NH3PbI3), a material already used in conventional perovskite solar cells, where it harvests visible-light photons that are then converted into electricity. They fabricated single crystals of methylammonium lead iodide and tested them on photocurrent generation while irradiating them with X-rays, where they found 75% charge-collection efficiency in millimeter-sized crystals. This high-efficiency current conversion for X-ray radiation also matched the material鈥檚 high X-ray absorption coefficient.

In terms of degradation, the material鈥檚 performance decreased less than 20% when hit with X-ray doses similar to those in space, which may represent very promising stability for high-radiation doses. According to the researchers, the combination of these features can lead to fabricating photovoltaic cells that can harvest visible, X-ray, and even gamma-ray photons. Such technology can have far-reaching advantages for space exploration, as well as converting waste radiation in nuclear powerplants.

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Perovskites enable quantum dots for displays, lasers and solar cells

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 organic鈥搃norganic 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…

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