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Browsing by Author "Svavarsson, Halldor"

Browsing by Author "Svavarsson, Halldor"

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    Fabrication and characterization of Si1−xGex nanocrystals in as-grown and annealed structures: a comparative study 
    Sultan, Muhammad Taha; Maraloiu, Adrian Valentin; Stavarache, Ionel; Gudmundsson, Jon Tomas; Manolescu, Andrei; Teodorescu, Valentin Serban; Ciurea, Magdalena Lidia; Svavarsson, Halldor (Beilstein Institut, 2019-09-17)
    Multilayer structures comprising of SiO2/SiGe/SiO2 and containing SiGe nanoparticles were obtained by depositing SiO2 layers using reactive direct current magnetron sputtering (dcMS), whereas, Si and Ge were co-sputtered using dcMS and high-power impulse ...
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    Germanium coated silicon nanowires as human respiratory sensing device 
    Aghabalaei Fakhri, Elham; Sultan, Muhammad Taha; Manolescu, Andrei; Ingvarsson, Snorri; Svavarsson, Halldor (IEEE, 2022-10-12)
    We report on germanium coated silicon nanowires structures synthesized with metal assisted chemical etching and qualify their functionality as human respiratory sensor. The sensors were made from p-type single-crystalline (100) silicon wafers using a ...
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    Photoluminescence study of Si<sub>1-x</sub>Ge<sub>x</sub> nanoparticles in various oxide matrices 
    Sultan, Muhammad Taha; Gudmundsson, J. T.; Manolescu, Andrei; Ciurea, Magdalena Lidia; Svavarsson, Halldor; Ingvarsson, Snorri (IEEE, 2021-10-06)
    We investigate the photoluminescence properties of structures comprising of Si1-xGex nanoparticles (NPs) within SiO2, GeO2, TiO2 and Ta2O5 oxide matrices. Of the investigated structures, it was observed that the structures with GeO2 and TiO2 matrices ...
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    Piezoresistance characterization of silicon nanowires in uniaxial and isostatic pressure variation 
    Aghabalaei Fakhri, Elham; Plugaru, Rodica; Sultan, Muhammad Taha; Kristinsson, Thorsteinn; Árnason, Hákon Örn; Plugaru, Neculai; Manolescu, Andrei; Ingvarsson, Snorri; Svavarsson, Halldor (MDPI AG, 2022-08-23)
    Silicon nanowires (SiNWs) are known to exhibit a large piezoresistance (PZR) effect, making them suitable for various sensing applications. Here, we report the results of a PZR investigation on randomly distributed and interconnected vertical silicon ...
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    Refractometric Sensing with Periodic Nano-Indented Arrays: Effect of Structural Dimensions 
    Carney, Daniel; Svavarsson, Halldor; Hemmati, Hafez; Fannin, Alexander; Yoon, Jae; Magnusson, Robert (MDPI AG, 2019-02-21)
    Fabrication and sensor application of a simple plasmonic structure is described in this paper. The sensor element consists of nano-patterned gold film brought about from two-dimensional periodic photoresist templates created by holographic laser ...
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    SiGe nanocrystals in SiO2 with high photosensitivity from visible to short-wave infrared 
    Stavarache, Ionel; Logofatu, Constantin; Sultan, Muhammad Taha; Manolescu, Andrei; Svavarsson, Halldor; Teodorescu, Valentin Serban; Ciurea, Magdalena Lidia (Springer Science and Business Media LLC, 2020-02-24)
    Films of SiGe nanocrystals (NCs) in oxide have the advantage of tuning the energy band gap by adjusting SiGe NCs composition and size. In this study, SiGe-SiO2 amorphous films were deposited by magnetron sputtering on Si substrate followed by rapid ...