Sökning: "heterostructures"

Visar resultat 1 - 5 av 20 uppsatser innehållade ordet heterostructures.

1. 1. Simulation of Quantum Cascade Lasers

   Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

   Författare :Zakaria Mohamed; [2023]
   Nyckelord :Quantum Cascade Lasers; Simulations; Numerical Methods; Computational Models; Heterostructures; Physics and Astronomy;

   Sammanfattning : This thesis aimed to contribute to the improvement of Quantum Cascade Lasers (QCLs) by focusing on the effective determination of quantum levels in these devices. The current method relies on an outdated Fortran code, which poses challenges when integrating into optimization schemes. LÄS MER

3. 2. In-situ Growth of Sn-seeded GaAs and GaSb Nanowire Heterostructures

   Master-uppsats, Lunds universitet/Centrum för analys och syntes

   Författare :Azemina Kraina; [2023]
   Nyckelord :nanowire; heterostructure; ETEM; MOCVD; TEM; in-situ; Sn; GaAs; GaSb; materials chemistry; Technology and Engineering; Chemistry;

   Sammanfattning : One of the ways to utilize III-V nanowires, is to make use of the possibility to combine materials and create heterostructures which allows for creating material combinations with new properties. A special interest can be taken into Sb-containing nanowires due to the high electron mobility, however there has been reported difficulties with switching to other materials because of a 'memory effect' where Sb lingers in the system and nanowire. LÄS MER

4. 3. Thermoelectric measurements on InAs nanowires with a ratchet-barrier

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Fasta tillståndets fysik

   Författare :Hanna Lundström; [2022]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Efficient extraction of thermal energy from electrons at the micro- and nanoscale is a long-standing scientific goal that could enable novel types of heat engines, heat management, and solar cell applications. Semiconductor nanowires are a promising system for investigating such devices for several reasons, such as their thermoelectric properties, and the potential to be grown in heterostructures with high flexibility. LÄS MER

5. 4. Phase and Interface Design in Potential Earth-Abundant Multi-Component Photocatalysts

   L3-uppsats, Lunds universitet/Kemiska institutionen

   Författare :David Llorens Rauret; [2022]
   Nyckelord :Facet control; in-situ TEM; nanoparticle heterostructures; phase transformation; transition metal phosphides; inorganic nanomaterials; Chemistry;

   Sammanfattning : Transition metal phosphides are low-cost, earth-abundant semiconductors with promising properties for photocatalysis, including water-splitting. When combined with other semiconductors or noble metals in nanoparticles, their photocatalytic performance can be drastically enhanced. LÄS MER

7. 5. Demonstration and investigation of hydrogen production by water splitting through plasmon assisted photocatalysis involving a cobalt catalyst.

   Magister-uppsats, Uppsala universitet/Fysikalisk kemi

   Författare :Amal Mendalz; [2022]
   Nyckelord :;

   Sammanfattning : Plasmonic heterostructures are of great interest within the industry and in the academia owing to theirapplications in photovoltaics and photocatalysis. The Localised surface plasmon resonance (LSPR) leading to an intensification of the electromagnetic (EM) field on the surface of the plasmonic nanoparticles results in an efficient absorption of light over miniscule thickness of the material. LÄS MER