Sökning: "epitaxial growth"

Visar resultat 1 - 5 av 32 uppsatser innehållade orden epitaxial growth.

1. 1. Inkjet printed piezoelectric energy harvesters based on self-assembly of diphenylalanine peptide

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

   Författare :Yujie Fu; [2023]
   Nyckelord :Inkjet printing; piezoelectric energy harvester; diphenylalanine peptide; self-assembly; Bläckstråleutskrift; piezoelektrisk energiskördare; difenylalaninpeptid; självmontering;

   Sammanfattning : Diphenylalanine peptide (Phe-Phe or FF) is a very promising bio-material in the future wearable electronics application due to its self-assembly into nanotubes and nanoribbons with high shear piezoelectric coefficient which is comparable to traditional inorganic piezoelectric materials. In order to efficiently harvest piezoelectric response, alignment and unidirectional polarization of FF nanotubes are required. LÄS MER

3. 2. Fabrication and characterization of GaAsxP1-x single junction solar cell on Si for III-V/Si tandem solar cell

   Master-uppsats, KTH/Tillämpad fysik

   Författare :Elaheh Aghajafari; [2023]
   Nyckelord :III-V semiconductor; GaAsxP1-x heteroeputaxy; hydride vapor phase epitaxy; III-V Si solar cell; III-V halvledare; GaAsxP1-x epitaxiallager; hydridångfasepitaxi; III-V Si solcell;

   Sammanfattning : Silicon based solar cells have been used as photovoltaic devices for decades due to reasonable cost and environment- friendly nature of silicon. But the conversion efficiency of silicon solar cell is limited; for instance, the maximum conversion efficiency of a crystalline silicon solar cell available in the market developed by Kaneka Corporation is 26 % [1]. LÄS MER

4. 3. Chromia-Alumina Thin Films from Alkoxide Precursors : From Precursor Synthesis to Deposition and Characterisation

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Oorganisk kemi

   Författare :Elina Elvelo; [2023]
   Nyckelord :alkoxide; synthesis; thin film; coating; alumina; chromia; spinodal decomposition;

   Sammanfattning : A hetero-bimetallic alkoxide CrAl3(OiPr)12 was synthesised through metathesis of achromium(III)chloride THF complex (CrCl3 . 3 THF) and 3 KAl(OiPr)4.It was used as a single sourceprecursor to make oxide powders and films with 1:3 chromium/aluminium compositionthrough sol-gel synthesis. LÄS MER

5. 4. Development of thick GaN and AlGaN drift layers for vertical power devices

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

   Författare :Andri Dhora; [2023]
   Nyckelord :Technology and Engineering;

   Sammanfattning : High-quality, thick III-nitride epitaxial drift layers with controlled doping are needed for next-generation highly efficient vertical power devices for a smart grid applications and electrification of mobility. Achieving desirable material properties, such as low background impurity concentrations and reduced dislocation densities in combination with high growth rates, necessary for practical application present a challenge. LÄS MER

7. 5. Microstructural and Micro-Mechanical Characterization of As-built and Heat-treated samples of HASTELLOY X produced by Laser Powder Bed Fusion Process

   Master-uppsats, Högskolan Dalarna/Institutionen för information och teknik

   Författare :Onimisi Sanni; [2022]
   Nyckelord :As-built Hastelloy X blocks; Laser powder bed fusion LPBF ; Solution heat-treatment; Disrupted epitaxial growth; Melt Pool Boundaries MPB ; Grain Boundaries GB ; Precipitates; In-situ microtensile testing; microhardness; Mechanical properties; Twin grain boundary fractions;

   Sammanfattning : Microstructure and micro-mechanical characterization of as-built and heat-treated samples of Hastelloy X produced by laser powder bed fusion (LPBF) process has been carried out in this study. As-built LPBF blocks were solution heat-treated at 1177°C and 1220°C followed by fast cooling. LÄS MER