Search for dissertations about: "S. Chen"

Showing result 1 - 5 of 29 swedish dissertations containing the words S. Chen.

  2. 1. Excitonic Effects and Energy Upconversion in Bulk and Nanostructured ZnO

    Author : Shula Chen; Irina Buyanova; Weimin Chen; Detlev M. Hofmann; Linköpings universitet; []
    Keywords : ;

    Abstract : Zinc Oxide (ZnO), a II-VI wurtzite semiconductor, has been drawing enormous research interest for decades as an electronic material for numerous applications. It has a wide and direct band gap of 3.37eV and a large exciton binding energy of 60 meV that leads to intense free exciton (FX) emission at room temperature. READ MORE

  4. 2. Excitonic effects in ZnO

    Author : Shula Chen; Irina Buyanova; Weimin Chen; Ivan Ivanov; Linköpings universitet; []
    Keywords : ;

    Abstract : Zinc Oxide (ZnO) is an extensively researched II-VI wide bandgap semiconductor material. As a promising material for future optoelectronic and spintronic applications, it continues to attract enormous amount of interest. READ MORE

  5. 3. Theoretical Studies on CO2 Reduction Electrocatalysts

    Author : Xiaoyu Chen; Mårten S. G. Ahlquist; Sandra Luber; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Computational Chemistry; CO2 reduction; electrocatalysis; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

    Abstract : The atmospheric CO2 concentration has increased by more than 20% since 1980s and has now reached the highest level than at any point in the past 800 000 years. Electrochemical CO2 reductions are receiving particular in- terest as the apparatus are relatively easy to maintain and cheap to operate. READ MORE

  6. 4. MOCVD growth of GaN-based high electron mobility transistor structures

    Author : Jr-Tai Chen; Erik Janzén; Urban Forsberg; James S. Speck; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The present work was to improve the overall quality of GaN-based high electron mobility transistor (HEMT) epitaxial structures grown on semi-insulating (SI) SiC and native GaN substrates, using an approach called bottom-to-top optimization. The bottom-to-top optimization means an entire growth process optimization, from in-situ substrate pretreatment to the epitaxial growth and then the cooling process. READ MORE

  7. 5. Room-temperature defect-engineered spin functionalities in Ga(In)NAs alloys

    Author : Yuttapoom Puttisong; Weimin Chen; Irina Buyanova; Martin S. Brandt; Linköpings universitet; []
    Keywords : ;

    Abstract : Semiconductor spintronics is one of the most interesting research fields that exploits both charge and spin properties for future photonics and electronic devices. Among many challenges of using spin in semiconductors, efficient generation of electron spin polarization at room temperature (RT) remains difficult. READ MORE