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      Photonic Synapses Based on Inorganic Perovskite Quantum Dots for Neuromorphic Computing

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          Phase-change materials for rewriteable data storage.

          Phase-change materials are some of the most promising materials for data-storage applications. They are already used in rewriteable optical data storage and offer great potential as an emerging non-volatile electronic memory. This review looks at the unique property combination that characterizes phase-change materials. The crystalline state often shows an octahedral-like atomic arrangement, frequently accompanied by pronounced lattice distortions and huge vacancy concentrations. This can be attributed to the chemical bonding in phase-change alloys, which is promoted by p-orbitals. From this insight, phase-change alloys with desired properties can be designed. This is demonstrated for the optical properties of phase-change alloys, in particular the contrast between the amorphous and crystalline states. The origin of the fast crystallization kinetics is also discussed.
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            Ultrafast charge transfer in atomically thin MoS₂/WS₂ heterostructures.

            Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional layers, including graphene, hexagonal-boron nitride and transition-metal dichalcogenides (MX2), give rise to fascinating new phenomena. MX2 heterostructures are particularly exciting for novel optoelectronic and photovoltaic applications, because two-dimensional MX2 monolayers can have an optical bandgap in the near-infrared to visible spectral range and exhibit extremely strong light-matter interactions. Theory predicts that many stacked MX2 heterostructures form type II semiconductor heterojunctions that facilitate efficient electron-hole separation for light detection and harvesting. Here, we report the first experimental observation of ultrafast charge transfer in photoexcited MoS2/WS2 heterostructures using both photoluminescence mapping and femtosecond pump-probe spectroscopy. We show that hole transfer from the MoS2 layer to the WS2 layer takes place within 50 fs after optical excitation, a remarkable rate for van der Waals coupled two-dimensional layers. Such ultrafast charge transfer in van der Waals heterostructures can enable novel two-dimensional devices for optoelectronics and light harvesting.
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              Colloidal CsPbBr3Perovskite Nanocrystals: Luminescence beyond Traditional Quantum Dots

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                Author and article information

                Journal
                Advanced Materials
                Adv. Mater.
                Wiley
                09359648
                September 2018
                September 2018
                July 31 2018
                : 30
                : 38
                : 1802883
                Affiliations
                [1 ]College of Electronic Science and Technology; Shenzhen University; Shenzhen 518060 P. R. China
                [2 ]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 P. R. China
                [3 ]Institute for Advanced Study; Shenzhen University; Shenzhen 518060 P. R. China
                Article
                10.1002/adma.201802883
                © 2018

                http://doi.wiley.com/10.1002/tdm_license_1.1

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