Browsing NTNU Open by Author "Reenaas, Turid Worren"
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3D TEM characterization of silver implanted silicon for intermediate band solar cells
Lysne, Hogne (Master thesis, 2017)As the need for renewable and sustainable energy sources are growing solar cells are turning into one of the most affordable and widely adopted solutions for renewable electricity production. This is driven by a steady ... -
Analysis and Simulation of Intermediate Band Solar Cells
Kristoffersen, Peter (Master thesis, 2015)Intermediate band solar cells (IBSC) is a technology that promises higher efficiency solar cells with comparatively simpler structure than the currently best performing solar cells on the market. In this work, different ... -
Analysis of Intermediate Band Solar Cell Performance
Vilpponen, Eirik Timo Bøe (Master thesis, 2011)This is the Master s Thesis of Eirik Timo Bøe Vilpponen, and was writtenat the Department of Physics at the Norwegian University of Science andTechnology (NTNU). The thesis is twofold, the first part being the comple-tion ... -
Analysis of the ZnO/Cu2O Thin Film Heterojunction for Intermediate Band Solar Cell Applications
Jacobsen, Ellen Caroline (Master thesis, 2015)In an attempt to increase the maximum theoretical efficiency of solar cells, one proposed device is called intermediate band solar cells (IBSC). The candidate material system chosen for this study is nitrogen doped cuprous ... -
Atomic force microscopy and variable angle spectroscopic ellipsometry of oxidising GaAs substrates for intermediate band solar cells
Holst-Dyrnes, Anne (Master thesis, 2018)The AFM images of the substrate sample revealed pits all over the sample surface that were tens of nanometers deep. The geometry of the pits on the surface seemed to be affected by the geometry of the AFM probe tip, ... -
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 ... -
Characterisation of tungsten-doped silicon - An intermediate band material candidate from ion implantation and nanosecond pulsed laser melting
Ristola, Markus Joel Benjamin (Master thesis, 2019)En overgang til fornybare energikilder er uunnværlig for å motvirke effektene av global oppvarming, og fotovoltaiske solceller er i ferd med å bli en av de mest anvendte løsningene takket deres stadig synkende kostnader ... -
Comparative Study of CdZnTe Substrates Prepared by Different Methods
Lauten, Oda (Master thesis, 2017)In this study, three different CdZnTe (CZT) substrates were characterised for surface impurity contamination, particles, and defects. The substrates were examined both as-received and after surface pre-growth preparation. ... -
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 ... -
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) ... -
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 ... -
Electronic properties of reduced molybdenum oxides
Inzani, Katherine; Nematollahi, Mohammadreza; Vullum-Bruer, Fride; Grande, Tor; Reenaas, Turid Worren; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2017)The electronic properties of MoO3 and reduced molybdenum oxide phases are studied by density functional theory (DFT) alongside characterization of mixed phase MoOx films. Molybdenum oxide is utilized in compositions ranging ... -
Exploring possibilities in AFM studies of InAs/GaAs QDs
Iden, Simon Riis (Master thesis, 2012)The main focus of this master thesis work has been to image InAs emph{quantum dots} (QDs) using emph{atomic force microscopy} (AFM), to identify and evaluate various image processing methods used to estimate the volume of ... -
Fabrication and Characterization of an Intermediate Band Material based on Ion Implantation and Pulsed Laser Melting of Ag in Fz-Si
Hauge, Heidi Sæverud (Master thesis, 2015)Intermediate band solar cells (IBSCs) are an innovative field of material engineering and their prospect of high efficiency may contribute to meet the demand for new energy alternatives. IBCSs are based on absorption of ... -
Growth and Characterization of Germanium Quantum Dots and Crystalline Silicon
Hanif, Muhammad (Master thesis, 2011)Germanium quantum dots in a silicon matrix can be used in so-called intermediate band solar cells. Such solar cells have efficiency limits exceeding that of the conventional single junction solar cells. In this master ... -
Initial Studies of Strontium Titanate Substrates and Room Temperature Deposited Titanium Dioxide Thin Films
Hannaas, Erling (Master thesis, 2017)To create doped titanium dioxide TiO2 thin films for use in intermediate band solar cells, it is important to be able to deposit thin films of high quality. To achieve this, substrates with surfaces of high quality is ... -
Intermediate Band Solar Cells Based on Cr:ZnS: Device Characterization and Simulation
Kusterle, Peter (Master thesis, 2014)Intermediate band solar cells (IBSCs) are emerging, potentially high efficiency, solar cells. In this work, IBSCs based on zinc-sulfide with a high chromium doping density (Cr:ZnS), are fabricated, characterized and gradually ... -
Methodology to Improve Strain Measurement in III–V Semiconductors Materials
Vatanparast, Maryam; Vullum, Per Erik; Nord, Magnus Kristofer; Reenaas, Turid Worren; Holmestad, Randi (Journal article; Peer reviewed, 2017)Geometric phase analysis (GPA), a fast and simple Fourier space method for strain analysis, can give useful information on accumulated strain and defect propagation in multiple layers of InAs/GaAs quantum dot (QD) materials. ... -
Modeling of the Intermediate Band Tandem Solar Cell: Using the AM1.5 Spectra
Linge, Christer Andreas R (Master thesis, 2011)In this thesis the results from simulations of a tandem intermediate band solar cell are presented and discussed. Renewable energy sources have become increasingly important, because of global environmental concerns. To ... -
Molecular beam and pulsed laser deposition of ZnS:Cr for intermediate band solar cells
Nematollahi, Mohammadreza; Yang, Xiaodong; Aas, Lars Martin Sandvik; Ghadyani, Zahra; Kildemo, Morten; Gibson, Ursula; Reenaas, Turid Worren (Journal article, 2015)We have investigated the structural and optical properties of Cr-doped ZnS (ZnS:Cr) thin films (0–7.5 at.% Cr) for use in intermediate band solar cells. The films were grown on Si(100) in molecular beam epitaxy (MBE) and ...