Dissertation - Carlos Triana
Carlos Triana will defend his thesis entitled ""Atomic short-range order, optical and electronic properties of amorphous transition metal oxides. An experimental and theoretical study of amorphous titanium aTiO2 and tungsten aWO3 solid thin-film oxides" the 15:th of May at 13:15, in room Å80101
Amorphous transition metal oxides [aTMOs], have emerged as innovative functional materials for wide-ranging electronic, optical and energy-related applications. However, no systematic and broadly applicable method exists to assess their atomic-scale correlations, and since the optical and electronic processes are local structure-dependent, still there are not well-stablished mechanisms that suitably explain the physical properties of aTMOs.
This thesis presents experimental and theoretical studies of the atomic short-range order, optical and electronic properties, and state-defects induced by Li+-ion-intercalation and oxygen-vacancies in amorphous titanium aTiO2 and tungsten aWO3 thin-film-oxides. Those properties play a key role for application in high energy-density Li+-ion batteries and in switchable dynamical modulation of solar- irradiation transmittance for energy efficient "smart windows", where the disorder-dependent Li+-ion-intercalation and oxygen-vacancy-induced defect-states influence charge-carrier transfer mechanisms.
After introducing the scope of this thesis, the fundamental theoretical concepts describing the experimental findings on amorphous solids are reviewed. Thereafter, a comprehensive analysis on the optical absorption phenomena experimentally observed in oxygen-deficient and Li+-ion-intercalated aLixTiO2-zand aLixWO3-z thin-films and a discussion on the electrochromic properties are presented. The optical absorption is described in the framework of the small polaron absorption model.
Finally, a state-of-the-art systematic procedure involving theory and experiment in a self-consistent computational framework is implemented to unveil the atomic-scale structure of aTiO2 and aWO3, and its role for the electronic properties. The procedure is based in Reverse Monte Carlo [RMC] and Finite Difference Method [FDM] simulations of X-ray-Absorption spectra to construct a disordered theoretical model having the same bonding and coordination distribution as the experimental system. Ab-initio molecular dynamics simulations and density functional theory are then used to assess defect-states induced by Li+-ion-intercalation and oxygen-vacancies in aTiO2 and aWO3 oxides.
The schemes introduced in this study offer a consistent route to experimentally and theoretically assess the role of the atomic-scale structure on the optical and electronic properties of aTiO2 and aWO3 and could be extended to the study of other aTMOs. The final results provide crucial insight towards the understanding of optical and electronic mechanisms where disorder-dependent ion-intercalation and oxygen-vacancy-induced localized defects-states influence charge transfer mechanisms of crucial importance for wide ranging optical and energy-related application of aTiO2 and aWO3 oxides.
Featured article published in Review of Scientific Instruments
Edgar A. Rojas-González and Gunnar A. Niklasson have published a featured article in Review of Scientific Instruments about a setup for simultaneous electrochemical and color impedance measurements of electrochromic films. The article can be accessed at http://doi.org/10.1063/1.5115119. Also, the science highlight (Scilight) of the article can be accessed at https://doi.org/10.1063/1.5122278. Scilights showcase the most interesting research across the physical sciences published in AIP Publishing Journals.
Dissertation: Zhen Qiu
On Tuesday the 21:st of May, at 13:15 in Polhemsalen Zhen Qiu will defend her thesis entitled "Transition metal-based electrocatalysts for alkaline water splitting and CO2 reduction". The entire thesis can be found online http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-380575
Post-doc position about magnetic multiferroics
The division is looking for a post-doc to work with nanoscale multiferroics. More information can be found under open positions.
David Langhammer will on Friday the 12:th of April at 10:15 in room Å2005 present his licenciate thesis entiteled "Adsorption and reactions of sulfur dioxide on TiO2 surfaces: Fundamental studies on single crystals and nanoparticles”
Post doc position about magnetic nanoparitcles
The division is looking for a post-doc to work with Atomic force microscopy of DNA-magnetic nanoparticle hybrid structures for biosensors.
Docent lecture: Shedding Light on new Perovskite solar cell Materials
The Department of Engineering Sciences hereby invite all interested to a docent (associate professorship) lecture by Dr. Meysam Pazoki in the subject solid state Physics at thursday 11thApril 2019 at 9.00 in room Å4001.
Dissertation JunXin Wang
JunXin Wang will defence his thesis entitled "Angle dependent light scattering of functional nanoparticle composites" on Friday the 8:th of March at 13:15 in Polhemsalen.
Dissertation: Rasmus Luthander
Rasmus Luthander will defence his thesis entiteled “Self-consumption of photovoltaic electricity in residential buildings” Thursday the 29:th of November at 13:15 in Häggsalen.
Licentiate seminar - Dennis van der Meer
Friday 16 November, Dennis van der Meer will present his licentiate thesis entitled “Spatio-temporal probabilistic forecasting of solar power, electricity consumption and net load” at 13:15 in Å2005.
The opponent is Dr. Jan Kloppenborg Møller from the Department of Mathematics and Computer Science at the Danish Technical University (DTU).
Dissertation - Andreas Mattsson
Andreas Mattsson will defend his thesis entiteled "Infrared spectroscopy studies of adsorption and photochemistry on TiO2 surfaces: From single crystals to nanostructured materials" on Wednesday the 21:st of November at 09:15 in Häggsalen.
Elbilsladdning i rum och tid
Institutionen för Teknikvetenskaper inbjuder härmed alla intresserade till docentföreläsning i ämnet Teknisk Fysik.
Föreläsare: Fil dr Joakim Munkhammar
Titel: ”Elbilsladdning i rum och tid”
Datum: Onsdagen den 5 september, 2018, kl. 09:00 (prick kl 09:00, tag plats innan!)
Plats: Häggsalen, Ångströmlaboratoriet
Ordförande: prof. Ewa Wäckelgård
Docenturnämndens representant: prof. Hana Barankova
Föreläsningen, som är ett lärarprov för den som ansökt om att bli antagen som docent, ska kunna följas av studenter och andra med kunskaper på grundutbildningsnivå inom ämnet, men kan även vara av intresse för en bredare publik. Föreläsningen varar 45 minuter med efterföljande frågestund och diskussion och kommer att ges på svenska/engelska
Dissertation - Tian Bo
Tian Bo will defend his thesis entitled "Magnetic Nanoparticle Based Biosensors for Pathogen Detection and Cancer Diagnostics" on Friday the 4:th of Mayl at 13:15, in Häggsalen
Dissertation - Serkan Akansel
Serkan Akansel will defend his thesis entitled "Magnetization Dynamics in Ferromagnetic Thin Films: Evaluation of Different Contributions to Damping in Co2FeAl and FeCo Film Structures" on Thursday the 3:rd of May at 13:15, in Polhemssalen.
Dissertation - Yuxia Ji
Yuxia Ji will defend her thesis entitled "Thermochromic VO2-based materials for smart windows: Progress towards applications in buildings" on Friday the 20:th of April at 9:30, in Häggsalen
Article published in physical review letters
Edgar Rojas has published an article in physical review letters with the title Continuous-Variable Triple-Photon States Quantum Entanglement.
Dissertation - David Lingfors
David Lingfors will defend his thesis entitled "Interacting Solar Variability Assessment in the Built Environment: Model Development and Application to Grid Integration" on Thursday the 21:st of December at 13:15, in Häggsalen.
Article published in Physical Review B
Daniel Hedlund, Sofia Kontos, Peter Svedlindh and Klas Gunnarsson have recently published an article in Physical Review B about the magnetic properties in the Fe5SiB2−Fe5PB2 system. Additional information can be found in the article https://journals.aps.org/prb/pdf/10.1103/PhysRevB.96.094433
Dissertation - Mikael Andersson
Mikael Andersson will defend his thesis entitled "Interacting Magnetic Nanosystems - An Experimental Study Of Superspin Glasses" on Friday the 2:nd of June at 13:15, in the Siegbahn hall.