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

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

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

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 elmélet átültetése a gyakorlatba, avagy a hallgatói zsebműhold az űrben várakozáson felül teljesít: Theory put into practice or pocket-satellite constructed by students works over expectation

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 nevű zsebműholdat 2019. december 6-án lőtték ki a világűrbe. Azóta is kifogástalanul működik. A zseb-műhold elődjéhez képest nyolcad akkora térfogatú. Mérete 5 x 5 x 5 cm3. A műholdra GaAs-alapú kvantumvölgyes napelem került. A műholdunkkal azonos időben kilőtt berendezések közül csak a miénk működik. A szakértők szerint a vetélytársak a napelem-installáláson buktak el. Jelen dolgozatunkban röviden bemutatjuk a műholdat majd a GaAs napelemre fókuszálunk

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

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

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