20 research outputs found

    Droplet Epitaxy as a Tool for the QD-Based Circuit Realization

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    The chapter describes a novel technology, called droplet epitaxy, in the view point of quantum-circuit realization. This technology is useful when quantum dots are to be produced, of different shape and size in various densities. There are self-assembling methods to achieve spatial ordering or spatial positioning. Out of some of the possible applications as an example, the register and cellular automata circuit will be described

    Quantum Dots Prepared by Droplet Epitaxial Method

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    In this work, we are dealing with the droplet epitaxially prepared quantum dots. This technology is not only an alternative way of the strain induced technique to prepare quantum dots, but it allows us to make various shaped nano structures from various material. The present paper deals not only with the so called conventional shaped quantum dot but also with the ring shaped dot, with the inverted dot and with dot molecules as well. Their thechnology, opto-electronical and the structural properties are also discussed

    Composition and Thickness of RE Sputtered Amorphous Silicon Alloy Films

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    Because the composition and the thickness of the thin films are very important forthe fabrication of the devices, in this study we have undertaken the determination of thecomposition and the thickness of the RF sputtered amorphous silicon alloy thin filmsdeposited at room temperature under very different preparation conditions by usingvarious techniques. Incorporation of argon is demonstrated in the room temperaturedeposited films and the thickness of the films measured by different methods such asRutherford backscattering, spectroscopicellipsometry and step-profiler are found to be inreasonable agreement with each other

    Az elmĂ©let ĂĄtĂŒltetĂ©se a gyakorlatba, avagy a hallgatĂłi zsebmƱhold az Ʊrben vĂĄrakozĂĄson felĂŒl teljesĂ­t: Theory put into practice or pocket-satellite constructed by students works over expectation

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    A pocket-satellite called SMOG-P was launched into space on December 6, 2019. It has been working excellently ever since. Its volume is eight times smaller than its predecessor. The size of SMOG-P is 5 x 5 x 5 cm3. The pocket-satellite is equipped with GaAs-based quantum-well solar cell. Of the satellites launched simultaneously, only ours is functional now. According to expert opinions, rival satellites failed in the process of the installation of the solar cell. In this paper, the satellite is shortly described and afterward we focus on the GaAs-based solar cells. Kivonat A SMOG-P nevƱ zsebmƱholdat 2019. december 6-ĂĄn lƑttĂ©k ki a vilĂĄgƱrbe. AzĂłta is kifogĂĄstalanul mƱködik. A zseb-mƱhold elƑdjĂ©hez kĂ©pest nyolcad akkora tĂ©rfogatĂș. MĂ©rete 5 x 5 x 5 cm3. A mƱholdra GaAs-alapĂș kvantumvölgyes napelem kerĂŒlt. A mƱholdunkkal azonos idƑben kilƑtt berendezĂ©sek közĂŒl csak a miĂ©nk mƱködik. A szakĂ©rtƑk szerint a vetĂ©lytĂĄrsak a napelem-installĂĄlĂĄson buktak el. Jelen dolgozatunkban röviden bemutatjuk a mƱholdat majd a GaAs napelemre fĂłkuszĂĄlunk

    GaAs epilayers grown on patterned (001) silicon substrates via suspended Ge layers

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    We demonstrate the growth of low density anti-phase boundaries, crack-free GaAs epilayers, by Molecular Beam Epitaxy on silicon (001) substrates. The method relies on the deposition of thick GaAs on a suspended Ge buffer realized on top of deeply patterned Si substrates by means of a three-temperature procedure for the growth. This approach allows to suppress, at the same time, both threading dislocations and thermal strain in the epilayer and to remove anti-phase boundaries even in absence of substrate tilt. Photoluminescence measurements show the good uniformity and the high optical quality of AlGaAs/GaAs quantum well structures realized on top of such GaAs layer

    Contribution to the Medieval Building Technology Based on the Reconstruction of a Rounded Church

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    This article presents the experimental archaeological project to build a medieval rotunda reconstruction using rough stone building technology. Here, a medieval rotunda reconstruction is presented by contemporary building technology. The rough stone building technology on an experimental archaeological project is demonstrated

    A napelem és fejlesztési perspektívåi

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