Quantum dots

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    08-Jul-2015
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Quantum Dots Description,production,Optical Properties,applications and future works in various fields of industry.

Transcript of Quantum dots

  • Amity School of Engineering & Technology

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    Presented By:-Maaz Hasan

    B.Tech (CSE)Sem -III

    QUANTUM DOTS

  • Amity School of Engineering & Technology

    INTRODUCTION

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    A QUANTUM DOTis aNano crystalmade ofsemiconductormaterials that are small enough to exhibit quantummechanicalproperties.Researchers have studied applications for quantum dotsintransistors,solarcells,LEDs,anddiodelasers.

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    PRODUCTIONThere are several ways to confine excitons in semiconductors,resultingindifferentmethodstoproducequantumdots.Quantumdotsaregrownbyadvancedepitaxialtechniquesorbyionimplantation,orinNanodevicesmadebystate-of-the-artlithographictechniques.

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    PRODUCTIONColloidal Synthesis:-ColloidalsemiconductorNano crystalsaresynthesizedfrom precursorcompounds dissolved in solutions, much like traditionalchemicalprocesses.

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    PRODUCTIONFabrication:-CMOS technology can be employed to fabricate silicon quantum dots. Ultra small (L=20 nm, W=20 nm) CMOS transistors behave as single electron quantum dots when operated at cryogenic temperature.

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    PRODUCTIONElectrochemical Assembly:-Highly ordered arrays of quantum dots may also be self-assembled by electrochemical techniques. A template is created by causing an ionic reaction at an electrolyte-metal interface which results in the spontaneous assembly of nanostructures.

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    OPTICAL PROPERTIESAn immediate optical feature of colloidal quantum dots is their colour. The larger the dot, the redder (lower energy) its Fluorescence Spectrum. Quantum dots can be synthesized with larger (thicker) shells (CdSe quantum dots with CdS shells). The shell thickness has shown direct correlation to the spectroscopic properties of the particles like lifetime and emission intensity, but also to the stability.

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    APPLICATIONSComputing:-Quantum dot technology is one of the most promising candidates for use in solid-state quantum computation. With several entangled quantum dots, or qubits, plus a way of performing operations, quantum calculations and the computers that would perform them might be possible.

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    APPLICATIONSPhotovoltaic Devices:-Quantum dots may be able to increase the efficiency and reduce the cost of today's typical silicon photovoltaic cells. . Quantum dot photovoltaic would theoretically be cheaper to manufacture, as they can be made "using simple chemical reactions."

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    IMPLEMENTATION

    Fig:-Implementation of Quantum dots in Quantum Computing

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    CONCLUSION QUANTUM DOTS is a Nano crystal made of semi-

    conductor materials that are small enough to exhibit quantum mechanical properties.

    There are several ways to confine excitons in semiconductors, resulting in different methods to produce quantum dots.

    Research effort around the world is being applied to expanding the accuracy and capabilities of this Nano Particles for its usage in the industry of Hardware Components and Electronics as it is one of the most promising candidates for use in solid-state quantum computation.

    Quantum dots have also been suggested as implementations of qubits for Quantum Information Processing.

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    FUTURE WORKSSeveral Research works are now focussing on the application of Quantum Dots in the hardware structure of Micro-Computers, Integrated Circuits, Silicon Chips and methods that preserves the unit necessary to power lightning fast viable Computers known that uses Hole spin rather than electron spin that keeps the quantum bits in same physical state up to 10 times longer than before.

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    REFERENCES

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