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Spectroscopy on nanoparticles without light 
Fiedler, Johannes; Persson, Clas; Buhmann, Stefan Yoshi (Journal article / Tidsskriftartikkel / SubmittedVersion, 2020)
One of the most-important tools in modern science is the analysis of electromagnetic properties by spectroscopy. The various types of spectroscopy can be classified by the underlying type of interactions between energy and ...
Carrier-mediated ferromagnetism in two-dimensional PtS2 
Iordanidou, Konstantina; Houssa, Michel; Persson, Clas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Using first principles calculations based on density functional theory, we study the impact of hole doping on the magnetic and electronic properties of two dimensional PtS2. Although 2D PtS2 is intrinsically non-magnetic, ...
Dynamic Impurity Redistributions in Kesterite Absorbers 
Grini, Sigbjørn; Aboulfadl, Hisham; Ross, Nils; Persson, Clas; Platzer-Björkman, Charlotte; Thuvander, Mattias; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Cu2ZnSn(S,Se)4 is a promising nontoxic earth‐abundant solar cell absorber. To optimize the thin films for solar cell device performance, postdeposition treatments at temperatures below the crystallization temperature are ...
Noble gas as a functional dopant in ZnO 
Malyi, Oleksandr; Sopiha, Kostiantyn; Persson, Clas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Owing to fully occupied orbitals, noble gases are considered to be chemically inert and to have limited effect on materials properties under standard conditions. However, using first-principles calculations, we demonstrate ...
Charge carrier and medium alteration of the magnitude and the sign of the Casimir-Lifshitz torque 
Thiyam, Priyadarshini; Parashar, Prachi; Shajesh, Kuloth Vayalombron; Malyi, Oleksandr; Boström, Mathias; Milton, K. A.; Brevik, Iver Håkon; Forsman, Jan; Persson, Clas (Journal article / Tidsskriftartikkel / SubmittedVersion, 2019)
Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (2018)], which is applied here ...
Strong Interplay between Sodium and Oxygen in Kesterite Absorbers: Complex Formation, Incorporation, and Tailoring Depth Distributions 
Grini, Sigbjørn; Sopiha, Kostiantyn; Ross, Nils; Liu, Xin; Bjørheim, Tor Svendsen; Platzer-Björkman, Charlotte; Persson, Clas; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Sodium and oxygen are prevalent impurities in kesterite solar cells. Both elements are known to strongly impact performance of the kesterite devices and can be connected to efficiency improvements seen after heat treatments. ...
Theoretical analyses of copper-based solar cell materials for the next generation of photovoltaics 
Chen, Rongzhen; Zamulko, Sergii; Huang, Dan; Persson, Clas (Chapter / Bokkapittel / SubmittedVersion, 2019)
This chapter describes the state of the art in computer simulations in the context of the development of high-efficiency solar cells. It discusses how one analyses by theoretical means the structural, electronic, and optical ...
Effects of Substrate and Post-Deposition Annealing on Structural and Optical Properties of (ZnO)1-x(GaN)x Films 
Olsen, Vegard Skiftestad; Bazioti, Kalliopi; Baldissera, Gustavo; Azarov, Alexander; Prytz, Øystein; Persson, Clas; Svensson, Bengt Gunnar; Kuznetsov, Andrej; Vines, Lasse (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
The structural and optical properties of magnetron sputtered thin films of (ZnO)1−x(GaN)x deposited on zinc oxide, sapphire, and silicon oxide are studied as a function of strain accumulation and post‐deposition anneals ...
Energy, phonon, and dynamic stability criteria of two-dimensional materials 
Malyi, Oleksandr; Sopiha, Kostiantyn; Persson, Clas (Journal article / Tidsskriftartikkel / SubmittedVersion, 2019)
First-principles calculations have become a powerful tool to exclude the Edisonian approach in search of novel two-dimensional (2D) materials. However, no universal first-principles criteria to examine the realizability ...
Dispersion forces in inhomogeneous planarly layered media: A one-dimensional model for effective polarizabilities 
Fiedler, Johannes; Spallek, Fabian; Thiyam, Priyadarshini; Persson, Clas; Boström, Mathias; Walter, Michael; Buhmann, Stefan Yoshi (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Dispersion forces such as van der Waals forces between two microscopic particles, the Casimir-Polder forces between a particle and a macroscopic object, or the Casimir force between two dielectric objects are well studied ...
Thermoelectric transport trends in group 4 half-Heusler alloys 
Berland, Kristian; Shulumba, Nina; Hellman, Olle; Persson, Clas; Løvvik, Ole Martin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
The thermoelectric properties of 54 different group 4 half-Heusler (HH) alloys have been studied from first principles. Electronic transport was studied with density functional theory using hybrid functionals facilitated ...
Thio-olivine Mn2SiS4 thin films by reactive magnetron sputtering: Structural and optical properties with insights from first principles calculations 
Davydova, A; Eriksson, J; Chen, Rongzhen; Rudisch, K; Persson, Clas; Scragg, Jonathan (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
Thio-olivines such as (Fe,Mn)2(Si,Ge)S4 have been proposed as candidate earthabundant materials for single and multi-junction solar cells. In this work we present the first investigation of Mn2SiS4thin films prepared by ...
Low temperature incorporation of selenium in Cu2ZnSnS4: Diffusion and nucleation 
Grini, Sigbjørn; Ross, Nils; Persson, Clas; Platzer-Björkman, Charlotte; Vines, Lasse (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
Band gap grading of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells can be achieved by varying the Sr = [S]/([S] + [Se]) ratio in the absorber layer with depth. One approach is a two-step annealing process where the absorber is first ...
Hole-doped 2D InSe for spintronic applications 
Iordanidou, Konstantina; Houssa, Michel; Kioseoglou, Joseph; Afanas’ev, Valeri; Stesmans, Andre; Persson, Clas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
Using first-principles calculations based on density functional theory, we study the magnetic and electronic properties of hole-doped two-dimensional InSe. Our simulations reveal that although 2D InSe is intrinsically ...
Understanding the optical properties of ZnO1−xSx and ZnO1−xSex alloys 
Baldissera, Gustavo; Persson, Clas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
ZnO1−xYx with chalcogen element Y exhibits intriguing optoelectronic properties as the alloying strongly impacts the band-gap energy Eg(x). In this work, we analyze and compare the electronic structures and the dielectric ...
 
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