Kristin Bergum

• Kumar, Raj; Bergum, Kristin; Riise, Heine Nygard; Monakhov, Eduard; Galeckas, Augustinas & Svensson, Bengt Gunnar (2020). Impact of post annealing and hydrogen implantation on functional properties of Cu2O thin films for photovoltaic applications. Journal of Alloys and Compounds.  ISSN 0925-8388.  825(5), s 1- 8 . doi: 10.1016/j.jallcom.2020.153982 Fulltekst i vitenarkiv.
• Nordseth, Ørnulf; Kumar, Raj; Bergum, Kristin; Chilibon, Irinela; Foss, Sean Erik & Monakhov, Eduard (2019). Nitrogen-Doped Cu2O Thin Films for Photovoltaic Applications. Materials.  ISSN 1996-1944.  12(18) . doi: 10.3390/ma12183038 Fulltekst i vitenarkiv.
• Bergum, Kristin; Riise, Heine Nygard; Gorantla, Sandeep Madhukar; Lindberg, Per; Jensen, Ingvild Julie Thue; Gunnæs, Anette Eleonora; Galeckas, Augustinas; Diplas, Spyridon; Svensson, Bengt Gunnar & Monakhov, Edouard (2018). Improving carrier transport in Cu2O thin films by rapid thermal annealing. Journal of Physics: Condensed Matter.  ISSN 0953-8984.  30(7) . doi: 10.1088/1361-648X/aaa5f4
• Nordseth, Ørnulf; Kumar, Raj; Bergum, Kristin; Fara, Laurentiu; Dumitru, Constantin; Craciunescu, Dan; Dragan, Florin; Chilibon, Irinela; Monakhov, Eduard; Foss, Sean Erik & Svensson, Bengt Gunnar (2018). Metal oxide thin-film heterojunctions for photovoltaic applications. Materials.  ISSN 1996-1944.  11(12), s 1- 10 . doi: 10.3390/ma11122593 Fulltekst i vitenarkiv.
• Nordseth, Ørnulf; Kumar, Raj; Bergum, Kristin; Fara, Laurentiu; Foss, Sean Erik; Haug, Halvard; Dragan, Florin; Craciunescu, Dan; Sterian, Paul; Chilibon, Irinela; Vasiliu, Cristina; Baschir, Laurentiu; Savastru, Dan; Monakhov, Edouard & Svensson, Gunnar (2017). Optical Analysis of a ZnO/Cu2O Subcell in a Silicon-Based Tandem Heterojunction Solar Cell. Green and Sustainable Chemistry.  ISSN 2160-6951.  7(1) . doi: 10.4236/gsc.2017.71005
• Bergum, Kristin; Riise, Heine Nygard; Gorantla, Sandeep Madhukar; Monakhov, Edouard & Svensson, Bengt Gunnar (2016). Thin film Cu2O for solar cell applications. Conference record of the Photovoltaic Specialists Conference.  ISSN 0160-8371.  2016-November, s 2770- 2773 . doi: 10.1109/PVSC.2016.7750156
• Gunnæs, Anette Eleonora; Gorantla, Sandeep Madhukar; Løvvik, Ole Martin; Gan, Jiantuo; Carvalho, Patricia; Svensson, Bengt Gunnar; Monakhov, Edouard; Bergum, Kristin; Jensen, Ingvild Julie Thue & Diplas, Spyridon (2016). Epitaxial strain-induced growth of CuO at Cu2O/ZnO interfaces. Journal of Physical Chemistry C.  ISSN 1932-7447.  120(41), s 23552- 23558 . doi: 10.1021/acs.jpcc.6b07197 Vis sammendrag

  Cu2O/ZnO has been envisaged as a potential material system for the next generation thin film solar cells. So far, the experimental efforts to obtain conversion efficiencies close to the theoretically predicted value have failed. Combining aberration-corrected (scanning) transmission electron microscopy and density functional theory modelling, we have studied the interfaces between single crystal c-axis oriented ZnO and high-quality magnetron sputtered Cu2O films. Strikingly, our study shows that the first ~5 nm of the Cu-oxide films have the structure of the monoclinic CuO phase. The CuO layer is textured with the (111), (11¯1), (¯111), (1¯1 ¯1), (¯1 ¯11), (1¯11), (¯11¯1) and (100) planes parallel to the (0001) and (000¯1) ZnO interfaces. The ionic arrangement on these planes resembles the hexagonal arrangement of the ZnO interface and epitaxy exists across the interface. A continued epitaxial growth of [111] oriented Cu2O follows resulting in epitaxial 180o rotation twins in the Cu2O layer. For the case with the (100)CuO interfacial plane we have: (111)[1¯10]Cu2O II (100)[011]CuO II (0001)[11¯20]ZnO. Because of a closer lattice matching of CuO with ZnO and Cu2O, the total strain and energy is reduced compared to a pure (111)Cu2O II (0001)ZnO interface. The existence of CuO is anticipated to be a contributing factor for the low conversion efficiencies obtained experimentally.

• Lindberg, Per Filip; Riise, Heine Nygard; Bergum, Kristin; Svensson, Bengt Gunnar & Monakhov, Edouard (2016). Electronic properties of Au/Cu2O/n-type Si heterojunction for energy conversion. Conference record of the Photovoltaic Specialists Conference.  ISSN 0160-8371.  2016-November, s 2807- 2810 . doi: 10.1109/PVSC.2016.7750164
• Scuderi, V.; Buccheri, Maria Antonietta; Impellizzeri, Giuliana; Di Mauro, A.; Rappazzo, Giancarlo; Bergum, Kristin; Svensson, Bengt Gunnar & Privitera, V. (2016). Photocatalytic and antibacterial properties of titanium dioxide flat film. Materials Science in Semiconductor Processing.  ISSN 1369-8001.  42, s 32- 35 . doi: 10.1016/j.mssp.2015.09.005
• Bergum, Kristin; Fjellvåg, Helmer & Nilsen, Ola (2015). Thickness dependent structural, optical and electrical properties of Ti-doped ZnO films prepared by atomic layer deposition. Applied Surface Science.  ISSN 0169-4332.  332, s 494- 499 . doi: 10.1016/j.apsusc.2015.01.124
• Bergum, Kristin; Hansen, Per-Anders; Fjellvåg, Helmer & Nilsen, Ola (2014). Structural, electrical and optical characterization of Ti-doped ZnO films grown by atomic layer deposition. Journal of Alloys and Compounds.  ISSN 0925-8388.  616, s 618- 624 . doi: 10.1016/j.jallcom.2014.07.177
• Bergum, Kristin; Magraso, Anna; Fjellvåg, Helmer & Nilsen, Ola (2014). Thin film fabrication and characterization of proton conducting lanthanum tungstate. Journal of Materials Chemistry A.  ISSN 2050-7488.  2(43), s 18463- 18471 . doi: 10.1039/c4ta03359k
• 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. Materials Research Society Symposium Proceedings.  ISSN 0272-9172.  1699 . doi: 10.1557/opl.2014.550
• Scuderi, V; Impellizzeri, G; Romano, L; Scuderi, M; Brundo, MV; Bergum, Kristin; Zimbone, M; Sanz, R; Buccheri, MA; Simone, F; Nicotra, G; Svensson, Bengt Gunnar; Grimaldi, MG & Privitera, V (2014). An enhanced photocatalytic response of nanometric TiO<sub>2</sub>wrapping of Au nanoparticles for eco-friendly water applications. Nanoscale.  ISSN 2040-3364.  6(19), s 11189- 11195 . doi: 10.1039/c4nr02820a
• Scuderi, Viviana; Impellizzeri, Giuliana; Romano, Lucia; Scuderi, Mario; Nicotra, Giuseppe; Bergum, Kristin; Irrera, Alessia; Svensson, Bengt Gunnar & Privitera, Vittorio (2014). TiO2-coated nanostructures for dye photo-degradation in water. Nanoscale Research Letters.  ISSN 1931-7573.  9(458) . doi: 10.1186/1556-276X-9-458
• Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor (2012). Crystal structure, chemical expansion and phase stability of HoMnO3 at high temperature. Journal of Solid State Chemistry.  ISSN 0022-4596.  196, s 528- 535 . doi: 10.1016/j.jssc.2012.07.024
• Tripathi, S; Petkov, V; Selbach, Sverre Magnus; Bergum, Kristin; Einarsrud, Mari-Ann; Grande, Tor & Ren, Y. (2012). Structural coherence and ferroelectric order in nanosized multiferroic YMnO3. Physical Review B. Condensed Matter and Materials Physics.  ISSN 1098-0121.  86(9) . doi: 10.1103/PhysRevB.86.094101
• Bergum, Kristin; Ikeda, Teruyuki & Snyder, Jeffrey G. (2011). Solubility and microstructure in the pseudo-binary PbTe-Ag(2)Te system. Journal of Solid State Chemistry.  ISSN 0022-4596.  184(9), s 2543- 2552 . doi: 10.1016/j.jssc.2011.07.012
• Bergum, Kristin; Okamoto, Hiroshi; Fjellvåg, Helmer; Grande, Tor; Einarsrud, Mari-Ann & Selbach, Sverre Magnus (2011). Synthesis, structure and magnetic properties of nanocrystalline YMnO3. Dalton Transactions.  ISSN 1477-9226.  40(29), s 7583- 7589 . doi: 10.1039/c1dt10536a

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• Bergum, Kristin (2020). Designing materials for tandem solar cells.
• Bergum, Kristin (2020). Tandem solar cells with novel materials.
• Karlsen, Kjetil; Bergum, Kristin & Monakhov, Eduard (2020). ZnOxNy as a top ceall absorber candidatein tandem solar cells.
• Sødahl, Elin Dypvik; Bergum, Kristin & Vines, Lasse (2020). HiPIMS deposition and characterization of amorphous ZnOxNy for solar cell applications.
• Torgersen, Eivind & Bergum, Kristin (2020). Doble solceller kan øke effektiviteten med 50 prosent. Titan.uio.no.
• Zariouh, Osama; Monakhov, Eduard & Bergum, Kristin (2020). Deposition of phase-pure Cu2O by magnetron sputtering.
• Bergum, Kristin (2019). Silicon-based tandem solar cells.
• Bergum, Kristin (2019). Thin film deposition techniques.
• Nyborg, Martin; Bergum, Kristin; Monakhov, Eduard & Svensson, Bengt Gunnar (2018). Nitrogen Doping of Sputtered Cuprous Oxide Thin Films by ion Implantation.
• Nyborg, Martin; Monakhov, Eduard & Bergum, Kristin (2018). Lithium Doped DC Magnetron Sputtered Cu2O Thin Films.
• Bathen, Marianne Etzelmüller; Bergum, Kristin; Ellingsen, Josef Gert Åsheim; Grini, Sigbjørn; Sky, Thomas Neset & Aarseth, Bjørn Brevig (2017). Omvisning for Arendal VGS.
• Bergum, Kristin (2017). Physical vapour deposition (PVD).
• Bergum, Kristin; Borgersen, Jon Arthur; Ellingsen, Josef Gert Åsheim; Frodason, Ymir Kalmann; Galeckas, Augustinas; Ingebrigtsen, Mads Eide; Kuznetsov, Andrej & Sky, Thomas Neset (2017). Omvisning MiNaLab.
• Bergum, Kristin; Borgersen, Jon Arthur; Ellingsen, Josef Gert Åsheim; Hallén, Anders; Ingebrigtsen, Mads Eide & Kuznetsov, Andrej (2017). Omvisning MiNaLab, Slemdal skole 4. trinn..
• Frodason, Ymir Kalmann; Bergum, Kristin; Sky, Thomas Neset; Ingebrigtsen, Mads Eide; Borgersen, Jon; Ellingsen, Josef Gert Åsheim; Galeckas, Augustinas & Kuznetsov, Andrej (2017). MiNa-Lab tour highlighting LENS activities.
• Johansen, Klaus Magnus H; Bergum, Kristin; Riise, Heine Nygard & Grini, Sigbjørn (2017). Advanced characterization of solar energy materials and novel solar cell concepts.
• 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.
• 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.
• 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.
• Monakhov, Edouard; Bathen, Marianne Etzelmüller; Bergum, Kristin; Sky, Thomas Neset & Weiser, Philip Michael (2017). Omvisning for the National Natural Science Foundation of China.
• Nordseth, Ørnulf; Fara, Laurentiu; Kumar, Raj; Foss, S. E.; Dumitru, C.; Muscurel, V.-F.; Dragan, F.; Craciunescu, D.; Bergum, Kristin; Haug, H.; Sterian, P.; Chilibon, I.la; Vasiliu, C.; Baschir, L.; Savastru, D.; Monakhov, Edouard & Svensson, Bengt Gunnar (2017). Electro-Optical Modeling of a ZnO/Cu2O Subcell in a Silicon-Based Tandem Heterojunction Solar Cell.
• Nordseth, Ørnulf; Kumar, Raj; Bergum, Kristin; Fara, Laurentiu; Chilibon, I.la; Foss, S. E.; Monakhov, Edouard & Svensson, Bengt Gunnar (2017). Silicon-Based Tandem Solar Cells Boosting the Performance Using Non-Toxic Metal Oxides. GIT Laboratory Journal Europe.  ISSN 1611-6038. . doi: http://www.laboratory-journal.com/science/material-science/silicon-based-tandem-solar-cells
• Bergum, Kristin; Nilsen, Ola & Fjellvåg, Helmer (2014). Energy materials by atomic Layer Deposition.
• Lindberg, Per Filip; Bergum, Kristin; Svensson, Bengt Gunnar & Monakhov, Edouard (2014). Electronic Properties of the ZnO/Si(100), (110) and (111) Interface.
• 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.
• 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.
• Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor (2012). HoMnO3+/-d - stability, structure and stoichiometry.
• Selbach, Sverre Magnus; Løvik, Amund Nordli; Bergum, Kristin; Tolchard, Julian R; Einarsrud, Mari-Ann & Grande, Tor (2012). Oxygen non-stoichiometry in hexagonal manganites.
• Selbach, Sverre Magnus; Tybell, Thomas; Einarsrud, Mari-Ann; Grande, Tor & Bergum, Kristin (2011). Multiferroism in BiFeO3 and YMnO3 nanoparticles.

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