Blar i NTNU Open på forfatter "Undheim, Espen"
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In-situ studies of multicrystalline silicon nucleation and growth on alpha- and beta-Si3N4 coated substrates
Undheim, Espen; Maeda, Kensaku; Arnberg, Lars; Holmestad, Randi; Fujiwara, Kozo; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2018)The growth of silicon on various nitride coated quartz substrates were studied using in-situ observation of the solidification process. Three different coating types were used: One consisting entirely of α-Si3N4 particles, ... -
Nucleation and growth of multicrystalline silicon
Undheim, Espen (Doctoral theses at NTNU;2018:42, Doctoral thesis, 2018)This work has focused on the nucleation process of multicrystalline silicon (mc-Si) for photovoltaic (PV) applications during solidification in α-Si3N4 coated crucibles, the typical crucible coating used commercially. ... -
Orientation relationship between b-Si3N4 and Si in multicrystalline silicon ingots for PV applications
Undheim, Espen; Vullum, Per Erik; Holmestad, Randi; Arnberg, Lars; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2018)β-Si3N4 particles are thought to be nucleation sites for silicon in multicrystalline silicon (mc-Si) ingots for PV applications. The orientation relationship (OR) between Si and β-Si3N4 has been investigated by transmission ... -
Transmission electron microscopy characterization of quantum dot based intermediate band solar cells
Undheim, Espen (Master thesis, 2014)In this thesis, two samples of quantum dot based intermediate band solar cells were studied and compared by transmission electron microscopy. These samples were grown on a (100) GaAs substrate, with a general structure ...