Sökning: "Mats Göthelid"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Mats Göthelid.

1. 1. Phthalocyanine interfaces : the monolayer region

   Författare :Pål Palmgren; Mats Göthelid; Mats Fahlman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phthalocyanine; III-V semiconductor; transition metal oxides; adsorption; self-assembly; Material physics with surface physics; Materialfysik med ytfysik;

   Sammanfattning : Organic molecules adsorbed on inorganic substrates are the topics of interest in this thesis. Interfaces of this kind are found in dye sensitized solar cells that convert solar energy to electricity, a promising environmentally friendly energy source which might provide a route to replace fossil fuels. LÄS MER

3. 2. Surface studies on α–sapphire for potential use in GaN epitaxial growth

   Författare :Björn Agnarsson; Mats Göthelid; Anders Sandell; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Surfaces and interfaces; Ytor och mellanytor;

   Sammanfattning : This Licentiate thesis summarizes the work carried out by the author the years 2004 to 2008 at the University of Iceland and the Royal Institute of Technology (KTH) in Sweden. The aim of the project was to investigate the structure of sapphire (alpha-Al2O3) surfaces, both for pure scientific reasons and also for potential use as substrate for GaN-growth by molecular beam epitaxy. LÄS MER

4. 3. Adsorption of molecular thin films on metal and metal oxide surfaces

   Författare :Zahra Besharat; Mats Göthelid; Mark Rutland; Magnus Johnson; W. Gregory Sawyer; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Self assembled monolayer SAM ; dye synthesis solar cell DSSC ; thiol; selenol; Cu2O 100 ; Cu2O 111 and dehydrogenation; Fysik; Physics; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Metal and metal oxides are widely used in industry, and to optimize their performance their surfaces are commonly functionalized by the formation of thin films. Self-assembled monolayers (SAMs) are deposited on metals or metal oxides either from solution or by gas deposition. LÄS MER

5. 4. Electronic and Molecular Surface Structures of Dye-Sensitized TiO2 Interfaces

   Författare :Maria Hahlin; Håkan Rensmo; Hans Siegbahn; Anders Sandell; Mats Göthelid; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photoelectron spectroscopy; Electron spectroscopy; Solar Cells; Dye; TiO2; Surface; Interface; Electronic structure; Molecular surface structure; coadsorbent; Physics; Fysik; Fysik; Physics;

   Sammanfattning : The dye-sensitized solar cell is a promising solar cell technology. In these systems the key process for light to electricity conversion is molecular in nature and is initiated in dye molecules adsorbed at a semiconducting surface. LÄS MER

7. 5. Initial stages of metal- and organic-semiconductor interface formation

   Författare :Pål Palmgren; Mats Göthelid; Mikael Grehk; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Semiconductor physics; Halvledarfysik;

   Sammanfattning : This licentiate thesis deals with the electronic and geometrical properties of metal-semiconductor and organic-semiconductor interfaces investigated by photoelectron spectroscopy and scanning tunneling microscopy. First in line is the Co-InAs interface (metal-semiconductor) where it is found that Co is reactive and upon adsorption and thermal treatment it alloys with the indium of the substrate to form metallic islands, about 20 nm in diameter. LÄS MER