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You searched for subject:(kvantbrunn). Showing records 1 – 2 of 2 total matches.

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1. Boxberg, Fredrik. Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures.

Degree: 2007, Helsinki University of Technology

The recent progress in microelectronic processing techniques has made it possible to fabricate artificial materials, dedicated and tailored directly for nanoelectronics and nanophotonics. The materials are designed to achieve a confinement of electrons to nanometer size foils or grains, often called quantum structures because of the quantization of the electron energies. In this work I have developed computationalmodels for the electronic structure, photonic recombination and carrier dynamics of quantum confined charge carriers of artificial materials. In this thesis I have studied in particular the effect of elastic strain on the ballistic transport of electrons, in silicon electron wave guides; and on the electronic structure and photonic properties of III-V compound semiconductor heterostructures. I have simulated two types of elastic strain. The strain in the silicon wave guides is induced by the thermal oxidation of the silicon processing and the strain of the III-V compound semiconductor structures is a result of a pseudomorphic integration of lattice mismatched materials. As one of the main results of this work, we have shown that the oxidation-induced strain can lead to current channeling effects in electron wave guides and a doubling of the conductance steps of the wave guide. In the case of the III-V compound semiconductor heterostructures, it was shown that piezoelectric potential (which is due to the elastic strain) complicates considerably the electron-hole confinement potential of strain-induced quantum dots. This has several consequences on the optical properties of these systems. Our results are well in agreement with experimental observations and do explain a set of experiments, which have so far lacked any explanation. This work does, thereby, imply a much better understanding of both silicon electron wave guides and strain-induced quantum dots. This could have implications for both further detailed experiments and future technological applications of the studied devices.

Den senaste utvecklingen inom mikroelektronikens processteknik har möjliggjort en tillverkning av nya konstgjorda material, som är skräddarsydda och optimerade för nanoelektronik och -fotonik. Dessa material är designade för att åstadkomma en begränsning av elektronernas utbredning till tunna skikt, tunna trådar eller små korn, med en storlek på endast några nanometer. De här konstruktionerna kallas ofta kvantstrukturer på grund av kvantiseringen av de ofria elektronernas energi. I det här arbetet har jag simulerat och utvecklat beräkningsmodeller för elektronstruktur, fotoniska egenskaper och laddningsbärardynamik i olika konstgjorda material. Jag har speciellt studerat hur elastiska spänningar i halvledarkristaller inverkar på ballistisk ledning, elektronstruktur och fotoniska egenskaper. Jag har simulerat två olika slag av elastiska spänningar. De elastiska spänningarna i elektronvågledare, gjorda av kisel, härrör från den termiska oxideringen av kisel, medan de elastiska spänningarna i III-V föreningshalvledarbaserade…

Advisors/Committee Members: Helsinki University of Technology, Department of Electrical and Communications Engineering, Laboratory of Computational Engineering.

Subjects/Keywords: quantum; electronics; photonics; electron waveguide; quantum dot; quantum wire; quantum well; kvant; elektronik; foton; elektronvågledare; kvantprick; kvanttråd; kvantbrunn

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Boxberg, F. (2007). Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2007/isbn9789512287284/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Boxberg, Fredrik. “Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures.” 2007. Thesis, Helsinki University of Technology. Accessed October 22, 2019. http://lib.tkk.fi/Diss/2007/isbn9789512287284/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Boxberg, Fredrik. “Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures.” 2007. Web. 22 Oct 2019.

Vancouver:

Boxberg F. Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures. [Internet] [Thesis]. Helsinki University of Technology; 2007. [cited 2019 Oct 22]. Available from: http://lib.tkk.fi/Diss/2007/isbn9789512287284/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Boxberg F. Modeling the Effect of Elastic Strain on Ballistic Transport and Photonic Properties of Semiconductor Quantum Structures. [Thesis]. Helsinki University of Technology; 2007. Available from: http://lib.tkk.fi/Diss/2007/isbn9789512287284/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Karlstad University

2. Ericsson, Leif. Silicon/Germanium Molecular Beam Epitaxy.

Degree: Physics and Mathematics, 2006, Karlstad University

Molecular Beam Epitaxy (MBE) is a well-established method to grow low-dimensional structures for research applications. MBE has given many contributions to the rapid expanding research-area of nano-technology and will probably continuing doing so. The MBE equipment, dedicated for Silicon/Germanium (Si/Ge) systems, at Karlstads University (Kau) has been studied and started for the first time. In the work of starting the system, all the built in interlocks has been surveyed and connected, and the different subsystems has been tested and evaluated. Service supplies in the form of compressed air, cooling water and electrical power has been connected. The parts of the system, their function and some of the theory behind them are described. The theoretical part of this master’s thesis is focused on low-dimensional structures, so-called quantum wells, wires and dots, that all are typical MBE-built structures. Physical effects, and to some extent the technical applications, of these structures are studied and described. The experimental part contains the MBE growth of a Si/Ge quantum well (QW) structure and characterisation by Auger Electron Spectroscopy (AES). The structure, consisting of three QW of Si0,8Ge0,2 separated by thicker Si layers, was built at Linköpings University (LiU) and characterised at Chalmers University of Technology (CTH). The result of the characterisation was not the expected since almost no Ge content could be discovered but an extended characterisation may give another result. Keywords: Silicon, Germanium, Molecular Beam Epitaxy, MBE, Quantum wells

Molecular Beam Epitaxy (MBE) är en väl etablerad metod när det gäller tillverkning av låg-dimensionella strukturer för forskningsändamål och lämpar sig väl för användning inom det expanderande forskningsområdet nanoteknologi. MBE utrustningen vid Karlstads universitet (Kau), som är avsedd för kisel/germanium (Si/Ge) strukturer, har studerats och startats för första gången. Under studien av systemet har alla inbyggda förreglingar utretts och anslutits och de olika delsystemen har testats och utvärderats. Tryckluft, kylvatten och el har utretts och anslutits. Systemets delar, deras funktion och i viss mån den bakomliggande teorin har studerats. Den teoretiska delen av detta arbete är inriktad mot låg-dimensionella strukturer d.v.s. kvant brunnar, kvanttrådar och kvantprickar, som alla är strukturer lämpliga för framställning i MBE processer. De fysikaliska effekterna och i viss mån de tekniska tillämpningarna för dessa strukturer har studerats. Den experimentella delen består av MBE tillväxt av en Si/Ge kvantbrunn-struktur och karakterisering m.h.a. Auger Electron Spectroscopy (AES). Tillväxten av strukturen, som består av tre kvantbrunnar av Si0,8Ge0,2 separerade av tjockare Si-lager, utfördes på Linköpings Universitet (LiU) och karakteriseringen utfördes på Chalmers Tekniska Högskola (CTH). Resultatet av karakteriseringen var inte det förväntade då knappast något Ge innehåll kunde detekteras men en utökad…

Subjects/Keywords: Silicon; Germanium; Molecular Beam Epitaxy; MBE; Quantum wells; Kisel; germanium; Molecular Beam Epitaxy; MBE; kvantbrunn; Physics; Fysik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ericsson, L. (2006). Silicon/Germanium Molecular Beam Epitaxy. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-146

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ericsson, Leif. “Silicon/Germanium Molecular Beam Epitaxy.” 2006. Thesis, Karlstad University. Accessed October 22, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-146.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ericsson, Leif. “Silicon/Germanium Molecular Beam Epitaxy.” 2006. Web. 22 Oct 2019.

Vancouver:

Ericsson L. Silicon/Germanium Molecular Beam Epitaxy. [Internet] [Thesis]. Karlstad University; 2006. [cited 2019 Oct 22]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-146.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ericsson L. Silicon/Germanium Molecular Beam Epitaxy. [Thesis]. Karlstad University; 2006. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-146

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.