• A review of materials engineering in silicon-based optical fibre 

      Healy, Noel; Gibson, Ursula; Peacock, Anna (Journal article; Peer reviewed, 2017)
      Semiconductor optical fibre technologies have grown rapidly in the last decade and there are now a range of production and post-processing techniques that allow for a vast degree of control over the core material's ...
    • Alkaline oxide interface modifiers for silicon fiber production 

      Nordstrand, Erlend Fjøsne; Dibbs, Andrew; Eraker, Andreas Juvkam; Gibson, Ursula (Journal article; Peer reviewed, 2013)
      We demonstrate the ability to pull small diameter silicon-core fibers with low oxygen content by using interface modifiers between the silica cladding and the semiconductor. Alkali earths scavenge oxygen and form a ...
    • Band-edge modification and mid-infrared absorption of co-deposited FexZn1-xS thin films 

      Molland, Nelly-Ann; Ghadyani, Zahra; Karhu, Eric Andrew; Poggio, Stefano; Nematollahi, Mohammadreza; Kildemo, Morten; Reenaas, Turid Worren; BelBruno, Joseph; Gibson, Ursula (Journal article; Peer reviewed, 2015)
      The bandgap of iron-doped ZnS has been reported by others to change significantly under the addition of a few atomic percent of iron, which would have significant implications for solar energy. Here, thin films of FexZn1-xS ...
    • Broadband infrared and THz transmitting silicon core optical fiber 

      Sørgård, Trygve; Song, Seunghan; Vullum, Per Erik; Kores, Cristine; Mølster, Kjell Martin; Laurell, Fredrik; Hawkins, Thomas A.; Ballato, John; Österberg, Ulf Lennart; Gibson, Ursula (Peer reviewed; Journal article, 2020)
      Silicon waveguide structures are a viable alternative for the transmission of signals over a wide range of frequencies, and new fabrication methods are key to increased applications. In this work, THz transparency of ...
    • Bulk fabrication and properties of solar grade silicon microwires 

      Martinsen, Fredrik A; Ballato, John; Hawkins, Thomas A.; Gibson, Ursula (Journal article; Peer reviewed, 2014)
      We demonstrate a substrate-free novel route for fabrication of solar grade silicon microwires for photovoltaic applications. The microwires are fabricated from low purity starting material via a bulk molten-core fibre ...
    • Characterisation of Silicon (Si) fibre Bragg grating in near-infrared band for strain and temperature sensing 

      Theodosiou, Antreas; Kalli, Kyriacos; Hawkins, Thomas A.; Ballato, John; Fokine, Michael; Gibson, Ursula (Journal article; Peer reviewed, 2018)
      This letter describes fibre Bragg grating inscription in crystalline siliconcore fibre using visible light femtosecond laser pulses. The femtosecond pulses at 517 nm propagate through the transparent silica glass cladding ...
    • Characterization of electrical activity and lifetime in compensated multicrystalline silicon 

      Austad, Karianne (Master thesis, 2011)
      This master's thesis concerns the electrical activity and lifetime in compensated multicrystalline silicon wafers used for solar cell production.Resistivity profiles across grain boundaries have been obtained by a Four ...
    • Characterization of GaN:ZnO p-n junctions 

      Knutsen, Hege (Master thesis, 2011)
      In this master thesis, thin lms of ZnO doped with various cobalt concentra-tions have been grown using Pulsed Laser Deposition (PLD). This growthtechnique is preferred because it is able to grow thin lms from a targetmaterial ...
    • Characterization of ZnS:Cr films for Intermediate Band Solar Cells 

      Aamodt, Tor Ingve (Master thesis, 2011)
      In this thesis samples of ZnS:Cr thin films have been made through physicalvapor deposition (PVD) with resistive heating and characterized by severalmethods. The thin films are of various thicknesses and contain ...
    • CO2 laser annealed SiGe core optical fibers with radial Ge concentration gradients 

      Wu, Wei; Balci, Mustafa H.; Song, Seunghan; liu, chunxin; Fokine, Michael; Laurell, Fredrik; Hawkins, Thomas A.; Ballato, John; Gibson, Ursula (Peer reviewed; Journal article, 2020)
      CO2 laser annealing of SiGe core, glass-clad optical fibers is a powerful technique for the production of single-crystal cores with spatially varying Ge concentrations. Laser power, laser scan speed and cooling air flow ...
    • Compositional and structural properties of pulsed laser-deposited ZnS:Cr films 

      Nematollahi, Mohammadreza; Yang, Xiaodong; Seim, Eivind; Vullum, Per Erik; Holmestad, Randi; Gibson, Ursula; Reenaas, Turid Worren (Journal article; Peer reviewed, 2016)
      We present the properties of Cr-doped zinc sulfide (ZnS:Cr) films deposited on Si(100) by pulsed laser deposition. The films are studied for solar cell applications, and to obtain a high absorption, a high Cr content ...
    • Compositional Characterisation of Optical InGaSb-core Microfibres 

      Svendsen, Silje Katrine (Master thesis, 2017)
      This thesis constitutes the first step on the way to understanding and applying the ternary InGaSb-semiconductor alloy in the field of nonlinear fibre optics. This semiconductor material is also interesting for applications ...
    • Crystalline GaSb-core optical fibers with room-temperature photoluminescence 

      Song, Seunghan; Healy, Noel; Svendsen, Silje; Österberg, Ulf; Cuervo Covian, Alejandra; Liu, Jifeng; Peacock, Anna; Ballato, John; Laurell, Fredrik; Fokine, Michael; Gibson, Ursula (Journal article; Peer reviewed, 2018)
      Glass-clad, GaSb-core fibers were drawn and subsequently laser annealed. The asdrawn fibers were found to be polycrystalline, possess Sb inclusions, and have oxide contamination concentrations of less than 3 at%. Melting ...
    • Design and Analysis of Optical Fiber Probes for Glucose Sensing in the Peritoneal Cavity 

      Walmsness, Per Magnus (Master thesis, 2016)
      This thesis is focused on the design and analysis of optical fiber probes for glucose sensing in the peritoneal cavity. The probes are to be used as absorption cells for near-infrared absorption spectroscopy of peritoneal ...
    • Doped ZnS Thin Films for Intermediate Band Solar Cells - Deposition and Characterization 

      Hope, Benjamin Roaldssønn (Master thesis, 2015)
      Intermediate band solar cells (IBSCs) has the potential of increasing the efficiency and reducing the cost of commercial solar cells. The realization of such cells relies on the development of intermediate band (IB) ...
    • Effect of Germanium in Silicon for Solar Applications 

      De Martino, Giuseppe (Master thesis, 2016)
      The effect of Ge in multicrystalline Silicon wafers is studied along with a comparison in smaller scale systems (microwires).
    • Electrical Characterization of Silicon Cores from Glass-Cladded Fibres 

      Lapointe, Kyle (Master thesis, 2014)
      Semiconductor core fibres represent an emerging technology with potential applications in many areas, including photovoltaics and optical transmission. Recent advances in fibre manufacturing techniques has allowed long, ...
    • Electrodeposition of Metal Oxides for Solar Cell Applications 

      Fyhn, Anna Maren Andersen (Master thesis, 2012)
      This thesis investigates the electrodeposition process of zinc-, copper-, silver-, and silver copperoxides at cathodic and anodic voltages. Silver copper oxide has been successfully electrodepositedon a substrate of PtSi ...
    • Electronic and optical properties of doped Cu2O and ZnS thin films 

      Polyakov, Stanislav (Doctoral theses at NTNU;2017:107, Doctoral thesis, 2017)
      In this thesis, two earth-abundant, easily fabricated semiconductors, Cu2O and ZnS, were investigated to explore their electronic and optical properties after doping. Fe doped ZnS has been studied as a potential material ...
    • Er,Yb:GdAl3(BO3)4 laser passively Q-switched by MBE-grown Cr:ZnS thin films 

      Gorbachenya, Konstantin N.; Kisel, Victor E.; Yasukevich, Anatoly S.; Tolstik, Nikolai; Karhu, Eric Andrew; Furtula, Vedran; Sorokin, Evgeni; Maltsev, VA; leonyuk, N.; Galinis, A.; Lipinskas, T.; Gibson, Ursula; Sorokina, Irina T; Kuleshov, Nikolai V. (Chapter; Peer reviewed, 2017)