Search for dissertations about: "Mattias Hammar"

Showing result 1 - 5 of 10 swedish dissertations containing the words Mattias Hammar.

2. 1. Type-II interband quantum dot photodetectors

   Author : Oscar Gustafsson; Mattias Hammar; Wenquan Ma; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photodetector; quantum dot; infrared; MOVPE; thermal imaging; type-II; photoluminescence; III V; InSb; InGaSb; InAs; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Abstract : Photon detectors based on single-crystalline materials are of great interest for high performance imaging applications due to their low noise and fast response. The major detector materials for sensing in the long-wavelength infrared (LWIR) band (8-14 µm) are currently HgCdTe (MCT) and AlGaAs/GaAs quantum wells (QW) used in intraband-based quantum-well infrared photodetectors (QWIPs). READ MORE

4. 2. Growth and characterisation of InGaAs-based quantum dots-in-a-well infrared photodetectors

   Author : Linda Höglund; Per-Olof Holtz; Mattias Hammar; Stefan Johansson; Sanjay Krishna; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material physics with surface physics; Materialfysik med ytfysik;

   Abstract : This thesis presents results from the development of quantum dot (QD) based infrared photodetectors (IPs). The studies include epitaxial growth of QDs, investigations of the structural, optical and electronic properties of QD-based material as well as characterisation of the resulting components. READ MORE

5. 3. Design and fabrication of long wavelength vertical cavity lasers on GaAs substrates

   Author : Rickard Marcks von Würtemberg; Mattias Hammar; Markus Amann; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; VCSEL; Selective Area Epitaxy; Epitaxial regrowth; Laser; Semiconductor physics; Halvledarfysik;

   Abstract : Vertical cavity surface emitting lasers (VCSELs) are today a commodity on the short wavelength laser market due to the ease with which they are manufactured. Much effort has in the last decade been directed towards making long wavelength VCSELs as successful in the marketplace. READ MORE

6. 4. Compound semiconductor materials and processing technologies for photonic devices and photonics integration

   Author : Carl Reuterskiöld Hedlund; Mattias Hammar; Mikael Östling; Sebastian Lourdudoss; Harri Lipsanen; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Informations- och kommunikationsteknik; Information and Communication Technology;

   Abstract : The advancement of semiconductor optoelectronics relies extensively on materials and processing technologies of ever-increasing sophistication, such as nanometer-range lithography, epitaxial growth methods with monatomic layer control, and anisotropic etching procedures that allows for the precise sculpturing of device features even in the limit of extreme aspect ratios. However, upcoming application needs puts requirements on optimized designs or device performances, e. READ MORE

7. 5. Leveraging HVPE for III-V/Si Integration and Mid-Infrared Photonic Device Fabrication

   Author : Axel Strömberg; Yan-Ting Sun; Sebastian Lourdudoss; Mattias Hammar; Charles Cornet; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; HVPE; III-V Si; Photovoltaics; PEC; MIR; non-linear optics; QPM; QCL; Energiteknik; Energy Technology;

   Abstract : This work covers the implementation of highly specialized epitaxial techniques enabled by the near-equilibrium hydride vapor-phase epitaxy growth process in III-V/Si integration for Si-based tandem solar cells and photoelectrochemical reactions, quasi phase matching GaP structures on GaAs substrates, and regrowth of InP:Fe on quantum cascade lasing structures.III-V/Si integration is an important topic in several fields of research with a significant one being solar energy harvesting. READ MORE