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    Perovskites tagged posts

    Odds are good for Unique 2D Compound

    October 27, 2020, Categories  Uncategorized

    The polarized light emission from a 7-layer cesium, bismuth and iodine triangle developed at Rice University, under circularly polarized excitation, shows the valleytronics mechanism in action. The inset shows the electronic state written and read optically in a valleytronic memory. Courtesy of the Lou Group

    Perovskites show potential for valleytronics applications. Engineers at Rice University and Texas A&M University have found a 2D material that could make computers faster and more energy-efficient.

    Their material is a derivative of perovskite — a crystal with a distinctive structure — that has the surprising ability to enable the valleytronics phenomenon touted as a possible platform for information processing and storage.

    The lab of materials scientist Jun Lou of Rice’s Brow...

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    Researchers find 1st compelling evidence of new property known as ‘Ferroelasticity’ in Perovskites

    May 23, 2017, Categories  Chemistry/Nanotechnology, Physics, Technology/Electronics

    1, Schematic shows a perovskite sample (black) examined by the photothermal induced resonance technique. When the sample absorbs pulses of light (depicted as disks in purple cones), the sample expands rapidly, causing the cantilever of an atomic force microscope (AFM) to vibrate like a struck tuning fork. The cantilever’s motion, which is detected by reflecting the AFM laser light (red) off the AFM detector, provides a sensitive measure of the amount of light absorbed. Credit: NIST 2. Image recorded by an atomic force microscope reveals the topography of a polycrystalline sample of the perovskite, including the boundaries between crystals. Credit: NIST 3. Illustration shows that in response to an applied stress, such as bending, the boundaries of the ferroelastic domains (red and blue regions depict domains oriented in different directions) become bigger or smaller. Credit: NIST

    1, Schematic shows a perovskite sample (black) examined by the photothermal induced resonance technique. When the sample absorbs pulses of light (depicted as disks in purple cones), the sample expands rapidly, causing the cantilever of an atomic force microscope (AFM) to vibrate like a struck tuning fork. The cantilever’s motion, which is detected by reflecting the AFM laser light (red) off the AFM detector, provides a sensitive measure of the amount of light absorbed.  2. Image recorded by an atomic force microscope reveals the topography of a polycrystalline sample of the perovskite, including the boundaries between crystals. 3...

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    Self-Assembling Particles Brighten Future of LED Lighting

    January 17, 2017, Categories  Physics, Technology/Electronics

    A new type of LED is made with crystalline substances known as perovskites. CREDIT Sameer A. Khan/Fotobuddy

    A new type of LED is made with crystalline substances known as perovskites. CREDIT Sameer A. Khan/Fotobuddy

    Princeton engineers have refined the manufacturing of light sources made with crystalline substances, perovskites, a moreefficient and potentially lower-cost alternative to materials used in LEDs found on store shelves. The researchers developed a technique in which nanoscale perovskite particles self-assemble to produce more efficient, stable and durable perovskite-based LEDs. The advance, reported January 16 in Nature Photonics, could speed the use of perovskite technologies in commercial applications such as lighting, lasers and television and computer screens.

    LEDs emit light when voltage is applied across the LED...

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    Scientists find how Charge-Carrying Particles move in Perovskite

    June 28, 2016, Categories  Chemistry/Nanotechnology, Technology/Electronics

    Scientists find how Charge-Carrying Particles move in Perovskite

    Scientists find how Charge-Carrying Particles move in Perovskite

    Perovskites can be used in solar batteries of future. New results will help scientists to search for a required perovskite structure by taking into account its fundamental features, rather than at random. Perovskite is a material with an almost ideal structure. The majority of high-temperature superconductors are perovskite-based due to their non-ideal structure. The material can also be used to produce flexible solar batteries without rare-earth metals, which would help to reduce costs and enable large-scale manufacture.

    “This material exhibits many interesting and intriguing properties, most notably giant magnetoresistance...

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