quantum dot

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quantum dot

particles of semiconductor material smaller than 10 nm, used for staining and in vivo biomarker studies.
Synonym(s): nanocrystal
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In their article in this week's Applied Physics Reviews, from AIP Publishing, the authors describe their work testing hybrid organic-inorganic perovskite crystals treated with benzylamine to investigate the mechanisms by which the surface of the crystal is passivated, and traps states are reduced.
Release date- 26072019 - A study led by KU Leuven for the first time explains how a promising type of perovskites - man-made crystals that can convert sunlight into electricity - can be stabilized.
Director of University of Surrey's Advanced Technology Institute (ATI), Prof Ravi Silva, said perovskite photovoltaics "are an upcoming solar technology" that could help manufacture environment-friendly solar panels.
The offhand comment led the team to recall that the caffeine in coffee is an alkaloid compound containing molecular structures that could interact with the precursors of perovskite materials -compounds with a particular crystal structure that forms the light-harvesting layer in a class of solar cells.
This led the team to remember that coffee's caffeine is an alkaloid compound containing molecules similar to the materials of perovskite of solar cells.
By spring 2017, small perovskite solar cells in labs were recording power conversion efficiencies above 22 percent, closing in on the current record for silicon-based solar cells of 26.7 percent efficiency and topping the typical commercial solar cell's 20 percent rating.
Figure 1a shows the XRD pattern for the SHNO material, which consists of strong peaks characteristic of a primitive cubic perovskite plus a few weak line reflections arising from the super-lattice resulting in the crystallization of this material in a cubic double perovskite Fmm space group (#225) (Howard, et al., 2003; Madueno, et al., 2006).
In recent years, a family of hybrid materials called perovskites has gained attention because they can achieve high power output more cheaply than silicon.
The novelty of the work consists in the constructing of the thermodynamic stability diagram for interesting and promising double perovskite YBa[Co.sub.2][O.sub.6-[delta]] for the first time.
In particular, they have been extensively employed in perovskite solar cells (PSCs) [1-3], contributing to boost their impressive evolution in the last ten years from an initial 3.8% [4] to a 22.1% [5] certified efficiency.
Benefiting from the advantage of flexibility in the oxidation states of transition metals and high tolerance of defective structures for oxygen vacancy or excess, the perovskite oxides with a general formula [ABO.sub.3-[delta]] (where A = rare earth or alkaline earth metal ions and B = transition-metal ions) can be engineered to fit a wide range of applications [10-12].