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Identifier |
000444325 |
Title |
Nanostructured doped nickel oxide thin films made by RF sputtering as hole transfer layers for transparent optoelectronic devices |
Author
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Αϊβαλιώτη, Χρυσούλα
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Thesis advisor
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Πελεκάνος, Νίκος
Απεραθίτης, Ηλίας
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Reviewer
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Στούμπος, Κωνσταντίνος
Ρεμεδιάκης, Ιωάννης
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Abstract |
The increasing energy consumption and consequently, the increase in
air pollutants have led to phenomena such as global warming (greenhouse
effect) with the well-known effects on the environment and human health.
Buildings are responsible for consuming about 40% of the total produced
energy, while windows are responsible for the loss of 10-25% of the thermal
energy of buildings. A properly designed smart window can control and
modulate solar heat and lighting and it is possible, at the same time, to
produce and store solar energy. In the last years, there has been increasing
interest in metal oxides due to their outstanding properties. The emerging
class of wide gap oxide semiconductors can be fabricated as transparent solar
cells, harvesting UV solar radiation, and integrated into optoelectronics as
power producers. Thus, transparent solar cells can be used for energyautonomous smart windows like electrochromics and/or tandem solar cells.
In this work, undoped NiO and Nitrogen (N) or Niobium (Nb) single or
co-doped NiO thin nanostructured films were fabricated by rf sputtering by
employing Ni and Ni-Nb targets in plasma containing % (Ar-O2-N2) gases. All
films were p-type oxide semiconductors but only N-doped NiO films were
transparent. The oxide layers were characterized by AFM, XRD, SEM-EDX, XPS,
Hall-effect and UV-Vis-NIR spectroscopy and the optimum ones were used to
demonstrate all oxide UV photovoltaics. Heterostructures based on metal
oxides were fabricated, namely p-NiO/n-TiO2 and the properties of the
heterodiodes were investigated in the dark and as UV-sensitive solar cells. The
layers of TiO2 consisted of double mesoporous/compact TiO2 films, as the
ones used in high efficiency perovskite solar cells.
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Language |
English |
Issue date |
2021-11-26 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/4/0/8/metadata-dlib-1639736127-661968-31764.tkl
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Views |
340 |