Volume : VIII, Issue : XII, December - 2018
Quantum Dots and their applications: A Review
Divij Sharma
Abstract :
Nanoparticles or nanocrystals are of great scientific interest as they are effectively a idge between a bulk material and atomic or molecular structures. A bulk material should have a constant physical properties regardless of its size ,but at nanoscale this is often not the case .When the size and dimension or dimensions of a material are reduced from a large or a macroscopic size to a very small size , the properties remains same at first , then small changes begin to occur.
Thus, nanostructures are the structures whose dimensions are between the molecular range and a microscopic range i.e, between 0.1 nm to 100 nm .Their classification can be made as Quantum Well, Quantum Wire and Quantum Dot . If one dimension is reduced to a nano–range and the other two dimensions remains large , then we obtain a structure called as QUANTUM WELL.
If two dimensions are reduced and one is large we obtain QUANTUM WIRE ,further reducing all the three dimensions to a nano range ,the structure obtained is of QUANTUM DOT .In other words we can define quantum dots as structures whose size is less than the exciton bohr radius of the semiconducting material . The word quantum is associated with these three types of nano structures because the changes in properties arise from the quantum mechanical nature of physics in the domain of ultra small, thus the charged particles in the nanostructures are governed by the laws of quantum mechanics rather than classical physics leading to significant changes in their physical and electrical properties . These effects are pronounced maximum in QUANTUM DOTS structures as the quantum confinement is along all the three spatial dimensions in these structures and because of this reason , they are best suited for nonlinear optical device applications such as tunable lasers , ultra fast optical switching devices , optical computing , optical waveguides, communication network , infrared detectors and many more .
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DOI : 10.36106/ijar
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Quantum Dots and their applications: A Review , Divij Sharma , INDIAN JOURNAL OF APPLIED RESEARCH : Volume-8|Issue-12| December-2018
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Quantum Dots and their applications: A Review , Divij Sharma , INDIAN JOURNAL OF APPLIED RESEARCH : Volume-8|Issue-12| December-2018
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