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Bergum, Kristin & Haanæs, Øystein Rygg
(2023).
Hvordan kan solcellene bli mer effektive?
[Internet].
Energi og Klima.
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Saxegaard, Kjetil Karlsen; Bergum, Kristin; Vines, Lasse & Monakhov, Eduard
(2023).
The effect of annealing on opto-electronic properties of ZnON films.
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Monakhov, Eduard; Bergum, Kristin; Vines, Lasse & Saxegaard, Kjetil Karlsen
(2023).
The UiO semiconductor group: Towards tandems with ZnON.
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Saxegaard, Kjetil Karlsen; Monakhov, Eduard; Vines, Lasse & Bergum, Kristin
(2023).
The effect of annealing on ZnON intended for solar cell applications.
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Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnOxNy films .
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Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on ZnON films.
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Karlsen, Kjetil; Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnOxNy films.
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Karlsen, Kjetil; Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnON films.
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Karlsen, Kjetil; Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnON films.
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Karlsen, Kjetil; Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
Electronic properties and dominant levels in ZnON.
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Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnON films.
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Saxegaard, Kjetil Karlsen; Bergum, Kristin; Monakhov, Eduard & Vines, Lasse
(2022).
The effect of oxygen and nitrogen concentrations on Opto-electronic properties of ZnON films.
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Bergum, Kristin
(2022).
Solceller: I dag og i morgen.
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Bergum, Kristin
(2022).
Designing tandem solar cells.
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Bergum, Kristin
(2022).
A comparison of thin film deposition techniques.
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Bergum, Kristin
(2022).
Designing tandem solar cells.
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Bergum, Kristin; Selj, Josefine Helene Krogh & Melteig, Elina
(2022).
Glemmer Norge sola når vi snakker om fornybar energi?
[Internet].
Universitetsplassen podcast for UiO, ep 85.
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Karlsen, Kjetil; Monakhov, Eduard; Vines, Lasse & Bergum, Kristin
(2021).
Electronic properties and the dominant levels in ZnON.
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Bergum, Kristin; Vines, Lasse & Monakhov, Eduard
(2021).
Electronic properties and the dominant levels in ZnON.
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Bergum, Kristin & Vogt, Yngve
(2021).
Kan hente ut 50 prosent mer strøm fra solceller.
[Journal].
Apollon.
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Bergum, Kristin & Aarmo, Johannes
(2021).
Solceller.
[Radio].
Radio Trøndelag.
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Karlsen, Kjetil; Monakhov, Eduard; Bergum, Kristin; Vines, Lasse & Thue Jensen, Ingvild
(2021).
Electronic properties and dominant levels in ZnON.
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Bergum, Kristin
(2020).
Designing materials for tandem solar cells.
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Bergum, Kristin
(2020).
Tandem solar cells with novel materials.
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Karlsen, Kjetil; Bergum, Kristin & Monakhov, Eduard
(2020).
ZnOxNy as a top cell absorber candidate in tandem solar cells.
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Bergum, Kristin
(2019).
Silicon-based tandem solar cells.
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Bergum, Kristin
(2019).
Thin film deposition techniques.
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Nyborg, Martin; Bergum, Kristin; Monakhov, Eduard & Svensson, Bengt Gunnar
(2018).
Nitrogen Doping of Sputtered Cuprous Oxide Thin Films by ion Implantation
.
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Nyborg, Martin; Monakhov, Eduard & Bergum, Kristin
(2018).
Lithium Doped DC Magnetron Sputtered Cu2O Thin Films
.
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Nordseth, Ørnulf; Fara, Laurentiu; Kumar, Raj; Foss, S. E.; Dumitru, C. & Muscurel, V.-F.
[Show all 17 contributors for this article]
(2017).
Electro-Optical Modeling of a ZnO/Cu2O Subcell in a Silicon-Based Tandem Heterojunction Solar Cell.
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Kumar, Raj; Bergum, Kristin; Riise, Heine Nygard; Monakhov, Edouard & Svensson, Bengt Gunnar
(2017).
Impact of post annealing on hydrogen implanted Cu2O thin film for solar cell applications.
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Kumar, Raj; Bergum, Kristin; Riise, Heine Nygard; Azarov, Alexander; Monakhov, Edouard & Svensson, Bengt Gunnar
(2017).
Impact of post deposition annealing on electrical properties of Cu2O thin films.
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Kumar, Raj; Bergum, Kristin; Riise, Heine Nygard; Monakhov, Edouard & Svensson, Bengt Gunnar
(2017).
Electrical and optical characterization of p type Cu2O thin film for solar cell applications.
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Bergum, Kristin; Borgersen, Jon Arthur; Ellingsen, Josef Gert Åsheim; Frodason, Ymir Kalmann; Galeckas, Augustinas & Ingebrigtsen, Mads Eide
[Show all 8 contributors for this article]
(2017).
Omvisning MiNaLab.
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Bergum, Kristin; Borgersen, Jon Arthur; Ellingsen, Josef Gert Åsheim; Hallén, Anders; Ingebrigtsen, Mads Eide & Kuznetsov, Andrej
(2017).
Omvisning MiNaLab, Slemdal skole 4. trinn.
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Bergum, Kristin
(2017).
Physical vapour deposition (PVD).
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Frodason, Ymir Kalmann; Bergum, Kristin; Sky, Thomas Neset; Ingebrigtsen, Mads Eide; Borgersen, Jon & Ellingsen, Josef Gert Åsheim
[Show all 8 contributors for this article]
(2017).
MiNa-Lab tour highlighting LENS activities.
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Monakhov, Edouard; Bathen, Marianne Etzelmüller; Bergum, Kristin; Sky, Thomas Neset & Weiser, Philip Michael
(2017).
Omvisning for the National Natural Science Foundation of China.
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Bathen, Marianne Etzelmüller; Bergum, Kristin; Ellingsen, Josef Gert Åsheim; Grini, Sigbjørn; Sky, Thomas Neset & Aarseth, Bjørn Brevig
(2017).
Omvisning for Arendal VGS.
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Johansen, Klaus Magnus H; Bergum, Kristin; Riise, Heine Nygard & Grini, Sigbjørn
(2017).
Advanced characterization of solar energy materials and novel solar cell concepts.
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Lindberg, Per Filip; Bergum, Kristin; Svensson, Bengt Gunnar & Monakhov, Edouard
(2014).
Electronic Properties of the ZnO/Si(100), (110) and (111) Interface.
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Lindberg, Per Filip; Quemener, Vincent; Bergum, Kristin; Gan, Jiantuo; Svensson, Bengt Gunnar & Monakhov, Edouard
(2014).
Electronic properties of the ZnO:Al/n-Si (100), (110) and (111) interfaces.
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Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor
(2012).
Oxygen non-stoichiometry in hexagonal manganites.
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Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor
(2012).
Crystal structure, phase transition, chemical expansion and defect chemistry of hexagonal HoMnO3.
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Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor
(2012).
HoMnO3+/-d - stability, structure and stoichiometry.
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Selbach, Sverre Magnus; Tybell, Thomas; Einarsrud, Mari-Ann; Grande, Tor & Bergum, Kristin
(2011).
Multiferroism in BiFeO3 and YMnO3 nanoparticles.
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Both, Kevin Gregor; Chatzitakis, Athanasios; Bergum, Kristin; Hansen, Per-Anders Stensby; Prytz, Øystein & Norby, Truls
(2023).
Plasmonically Enhanced Photocatalysis: Synthesis, Physical Properties, and Applications.
University of Oslo Livrary.
ISSN 1501-7710.
Full text in Research Archive
Show summary
In this work, plasmonic metal nanoparticles (MNPs) are utilized to improve the photoelectrochemical (PEC) response of strontium titanate (STO). These MNPs were introduced by either direct exsolution, i.e., nickel (Ni), copper (Cu), iron (Fe), ruthenium (Ru), and silver (Ag), or by galvanically replacing exsolved less noble MNPs, i.e., Ni by Gold (Au), or Cu for Ag. Au, Ag, and Cu were the materials chosen with significant plasmonic activity; Fe, Ru, Pt, and Ni were used to make MNPs with minimal plasmonic response.
Two different stoichiometries of STO were synthesized. One, La-doped A-site deficient STO (La0.6Sr0.2Ti0.9Ni0.1O3–x), was exclusively doped with Ni and utilized as powder samples. The other stoichiometry was A-site excess STO (Sr1.07Ti0.93M0.07O3±δ, where M is the dopant) was doped with various metals. These excess perovskites were studied in thin film and powder forms.
A-site excess STO thin films were deposited by pulsed laser deposition on silicon substrates. The as-deposited thin films appeared nanocrystalline or amorphous until the exsolution process was engaged. The exsolution step was studied explicitly for these A-site excess STO thin films where the formation of MNPs occurred not only at or near the thin film surface but also on grain interfaces and in bulk. Moreover, the dopant diffused significantly during the process.
While the size of the template particles depended on the exsolution conditions, the galvanic replacement reaction determined the shapes and sizes of the newly formed MNPs. The replacement time and the form (thin film/powder) of STO influenced the results, both completely replaced particles and partially replaced particles with complex structures were obtained. Additionally, more prolonged galvanic replacement reactions lead to larger particles. In turn, the specific shape of the plasmonic MNPs determined the localized surface plasmon resonance band shape and peak position.
Overall, exsolution leads to well-socketed MNPs, a property seemingly inherited by the MNPs created by galvanic replacement. Well-socketed MNPs are extremely difficult to obtain by any other technique and have a favorable localized surface plasmon resonance peak shift. The PEC response revealed that reducing STO first decreases the material’s response. Reducing it further, however, increases the PEC response significantly. Au MNPs increase the PEC performance until the MNPs reach a specific size and subsequently decrease the PEC performance when growing more prominent. This work highlights the ease by which well-socketed plasmonic MNPs can be created, some impossible to synthesize by another technique, and how different reaction conditions can change the shape and size of the MNPs, ultimately tuning the localized surface plasmon resonance band shape and peak position. The method of exsolution and galvanic replacement reaction was generalized by utilizing different elements, implying that the tuning of catalytic activity depends on the choice of elements and reaction conditions.
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