Browsing NTNU Open by Author "Nematollahi, Mohammadreza"

Now showing items 1-9 of 9

    • 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 ...

    • 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 ...

    • Cr-doped ZnS for Intermediate Band Solar Cells 

      Nematollahi, Mohammadreza (Doktoravhandlinger ved NTNU, 1503-8181; 2014:274, Doctoral thesis, 2014)
      Intermediate band solar cells (IBSCs) can potentially be highly efficient solar cells. This thesis presents the growth and characterization of highly doped chromium doped zinc sulfide (Cr:ZnS) films for use in IBSCs. The ...

    • 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 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 ...

    • 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 ...

    • Progression of reduction of MoO3 observed in powders and solution-processed films 

      Inzani, Katherine; Nematollahi, Mohammadreza; Selbach, Sverre Magnus; Grande, Tor; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2017)
      Understanding the reduction of MoO3 is important for the utilization of this material in optoelectronic applications. Here, we examine the changes that take place during reduction of a solution-processed thin film of MoO3. ...

    • Pulsed laser ablation and deposition of ZnS:Cr 

      Nematollahi, Mohammadreza; Yang, Xiaodong; Gibson, Ursula; Reenaas, Turid Worren (Journal article; Peer reviewed, 2015)
      We present a method to deposit films with a range of doping concentrations/dilute alloys, from a single target in pulsed laser deposition (PLD). Cr-doped ZnS films were deposited by ablating a target consisting Cr particles ...

    • Tailoring properties of nanostructured MoO3−x thin films by aqueous solution deposition 

      Inzani, Katherine; Nematollahi, Mohammadreza; Selbach, Sverre Magnus; Grande, Tor; Waalekalv, Magnus Langøien; Brakstad, Thomas; Reenaas, Turid Dory; Kildemo, Morten; Vullum-Bruer, Fride (Journal article, 2018)
      Molybdenum oxide films are required for a large range of optical, electronic and catalytic applications, and optimal film characteristics are similarly broad. Furthermore, the layered crystal structure of MoO3 is suited ...