Sökning: "MOCVD"

Visar resultat 1 - 5 av 9 uppsatser innehållade ordet MOCVD.

1. 1. 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

3. 2. Fabrication and characterisation of RGB LEDs based on nanowire technology

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

   Författare :Patrik Olausson; [2019]
   Nyckelord :RGB LEDs; InGaN; GaN; nitrides; platelets; nanotechnology; Technology and Engineering;

   Sammanfattning : The white light LEDs of today are usually based on a blue LED and a phosphor, converting the blue light to longer wavelengths. While these phosphor-converted LEDs are extremely efficient compared to incandescent light or fluorescent light, there is still plenty of room for improvement. LÄS MER

4. 3. Optimization of gas flow uniformity in enhancement of Metal Organic Chemical Vapor Deposition growth for III-nitrides

   Master-uppsats, Linköpings universitet/Halvledarmaterial

   Författare :Kevin Olsson; [2019]
   Nyckelord :material science; mocvd; gan; semiconductors; gallium; nitride; fluid dynamics; termoelements; thermocouple; injector; heat transfer; thermal distribution; graphite; HEMT; III-nitrides; hot-wall MOCVD system; GaN-on-SiC; gas flow profile; laminar flow;

   Sammanfattning : The thesis focuses on the gas flow profile optimization of a non-conventional injector in a hot-wall MOCVD system. The injector’s gas flow profile is simulated with CFD and demonstrates awell-behaved laminar flow with a parabolic profile. LÄS MER

5. 4. Selective Area Growth of AlGaN pyramid with GaN Multiple Quantum Wells

   Master-uppsats, Linköpings universitet/Halvledarmaterial

   Författare :Hsin-Yu Chen; [2018]
   Nyckelord :selective area growth; MOCVD; AlGaN pyramid; GaN multiple quantum wells; undesired deposition;

   Sammanfattning :   Since Shuji Nakamura, Hiroshi Amano, and Isamu Akasaki won the 2014 Nobel prize in Physics owing to theircontributions on the invention of efficient blue GaN light emitting diodes, GaN became an even more appealingmaterial system in the research field of optoelectronics. On the other hand, quantum structures or low-dimensionalstructures with properties derived from quantum physics demonstrate superior and unique electrical and opticalproperties, providing a significant potential on novel optoelectronic applications based on the employment of quantumconfinement. LÄS MER

7. 5. Design and Fabrication of 1550 nm Photonic Crystal Surface Emitting Lasers

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :João Martins de Pina; [2018]
   Nyckelord :Photonic crystal; surface-emitting laser; metal organic chemical vapour deposition; III-V semi- conductors; light emitting diode.;

   Sammanfattning : In this study, the design and fabrication of a monolithic InP-based 1550-nm photonic-crystal surfaceemitting laser (PCSEL) is reported. The device is composed by an InGaAsP multi-quantum well (MQW) active layer and InP photonic crystal (PhC) formed by metal organic chemical vapour deposition (MOCVD). LÄS MER