| 1. |
- Greczynski, G., et al.
(författare)
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Photoelectron spectroscopy study of the energy level alignment at polymer/electrode interfaces in light emitting devices
- 2001
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Ingår i: Current applied physics. - 1567-1739 .- 1878-1675. ; 1:1, s. 98-106
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Tidskriftsartikel (refereegranskat)abstract
- The band alignment at the interface between electroluminescent polymers and the electrodes in polymer-LEDs was studied using photoelectron spectroscopy. Chemical factors like the formation of InCl3 during conversion of precursor-PPV on ITO could be directly monitored with XPS. Films of electroluminescent polymers were studied on a range of ITO and metal electrodes with different work functions, as well as with an intermediate, electrically conducting polymer layer, using UPS. Furthermore, the study of the band alignment at polymer electrode interfaces was extended to three-layer structures: the results confirm the common assumption that the potential drop over the polymer layer in polymer LEDs is equal to the difference between the electrode work functions. © 2001 Elsevier Science B.V.
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| 2. |
- Benyahia, K, et al.
(författare)
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Magneto-optical Kerr effect (MOKE) of the rare-earth silicide ErSi2 using ab-initio calculations
- 2009
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Ingår i: Current applied physics. - : Elsevier BV. - 1567-1739 .- 1878-1675. ; 9:5, s. 925-927
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Tidskriftsartikel (refereegranskat)abstract
- We present a computational method for the ab-initio study of the magneto-optical quantities using the augmented plane wave plus local orbitals (APW+lo) method. The calculations are performed within the local-density (LDA) approximation. In the present paper, the optical conductivity is the basic quantity for the evaluation of the magneto-optical Kerr effect (MOKE). Thus it is well described and calculated. Considerable work has been performed on the magneto-optical Kerr effect using experiments, however, no experimental or theoretical work has been investigated on rare-earth silicide ErSi2, in particular using ab-initio method. Our results consist a prediction. (C) 2008 Elsevier B.V. All rights reserved.
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| 3. |
- Hussain, Jawad, et al.
(författare)
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Modeling and simulation of planar SOFC to study the electrochemical properties
- 2020
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Ingår i: Current applied physics. - : ELSEVIER. - 1567-1739 .- 1878-1675. ; 20:5, s. 660-672
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, modeling and simulations are carried out using COMSOL Multiphysics. A three-dimensional model is developed for a planar intermediate temperature (IT) solid oxide fuel cell (SOFC). A parametric study has been carried out to analyze the performance of SOFC. Simulations reveal some promising features and enhanced performance of SOFC. It is shown that the maximum value of power (4-3.3) kW/m(2) still remains higher with significant rise of temperature (600 degrees C-1000 degrees C), nearly 0.15 kW/m(2) is the very small loss of power per 100 degrees C rise of temperature. Results have shown that the electrolytic current density is (6700-5500) A/m(2) for peak value of power (4-3.3) kW/m(2) with increase of temperature (600 degrees C-1000 degrees C). For model validation we have plotted a comparison of average current density.
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| 4. |
- Kibbou, M., et al.
(författare)
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Cs2InGaX6 (X=Cl, Br, or I) : Emergent Inorganic Halide Double Perovskites with enhanced optoelectronic characteristics
- 2021
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Ingår i: Current applied physics. - : Elsevier BV. - 1567-1739 .- 1878-1675. ; 21, s. 50-57
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Tidskriftsartikel (refereegranskat)abstract
- During the last decade, Inorganic Halide Double Perovskite materials have attracted widespread interest as a promising eco-friendly and non-toxic alternative to lead based hybrid halide organic–inorganic perovskites materials, with outstanding Stability, Structural and electronic properties. In this study, First-Principles density functional theory (DFT) calculations were performed on the structural, stability, electronic and optical properties of the transition metal-based double perovskites materials Cs2InGaX6 (X = Cl, Br, or I). Our results reveal that all these materials exhibit excellent thermodynamic and structural stability owing to their negative formation energies and Goldsmith's factors. It is also observed that Cs2InGaCl6, Cs2InGaBr6, and Cs2InGaI6 materials exhibit band gaps calculated by different functional (GGA-PBE and TB-mpj) in visible-range between 0.89 and 3.24 eV. Furthermore, the computed optical properties reveal strong absorption in UV, visible, and IR range with high optical conductivity and low reflectivity. These obtained results predict that the three transition metal-based double perovskites materials carries promising application in nano-electronic and optoelectronic device applications and can be considered as photovoltaic absorber materials.
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| 5. |
- Lee, Sanghoon, et al.
(författare)
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Magnetotransport properties of ferromagnetic semiconductor GaMnAs-based superlattices
- 2012
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Ingår i: Current applied physics. - : Elsevier BV. - 1567-1739 .- 1878-1675. ; 12:SUPPL. 2, s. S31-S36
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Tidskriftsartikel (refereegranskat)abstract
- Two series of GaMnAs/GaAs superlattices (SSs) comprised of ferromagnetic semiconductor GaMnAs layers and non-magnetic GaAs spacers were investigated by the electronic transport measurements with an external magnetic field applied in the plane of the sample. The two SL series consisted of specimens that were structurally the same, but the GaAs spacers layers of one series were doped by Be, while in the second series the spacers were undoped. Although in field scans taken at 4 K all SLs showed a typical anisotropic magnetoresistance (MR) behavior dominated by magnetic anisotropy, similar to that normally observed in single GaMnAs ferromagnetic layers grown on GaAs (001) substrates, some of the SLs showed signatures of interaction between the GaMnAs layers in the form of broadening of the MR hysteresis. The effect of inter-layer exchange coupling (IEC) between the GaMnAs magnetic layers became clear in the MR data taken at 30 K, where the strength of the magnetic anisotropy was reduced to the level of the inter-layer interaction. Specifically, MR measurements on two of the Be-doped SLs (BD2 and BD3) exhibited conspicuously large values of resistance at zero field, along with transitions of magnetization with negative coercive fields. The observation of these features in GaMnAs/GaAs SLs indicates the presence of spontaneous antiferromagnetic (AFM) inter-layer exchange coupling (IEC) between the GaMnAs magnetic layers. The study further revealed that the IEC in the GaMnAs multilayers strongly depended on the properties of the non-magnetic GaAs spacers, such as their thickness and the density of carriers in the layers. Importantly, these IEC effects occurred on a longer range than that expected from current theoretical studies.
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| 6. |
- Lundström, Ingemar, et al.
(författare)
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Natural nanosystems
- 2002
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Ingår i: Current applied physics. - 1567-1739 .- 1878-1675. ; 2:1, s. 17-21
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Tidskriftsartikel (refereegranskat)abstract
- A short review of our work on pigment containing cells as biosensors is given. It is pointed out that they combine several natural nanosystems, namely membrane bound receptors and their biochemical machinery, and the tubulin/actin network inside the cells for transport of submicron-sized pigment particles driven by molecular motors of 10-100 nm size.
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| 7. |
- Martin, Nicolas, et al.
(författare)
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Low temperature electronic transport in sputter deposited a-IGZO films
- 2014
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Ingår i: Current applied physics. - : Elsevier BV. - 1567-1739 .- 1878-1675. ; 14:11, s. 1481-1485
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Tidskriftsartikel (refereegranskat)abstract
- We report on the electrical properties of a-IGZO thin films prepared by reactive sputtering. Without oxygen injection, dc resistivity measured at room temperature is rho(300K) = 1.22 x 10(-3) Omega m. The lowest resistivity rho(300K) = 4.86 x 10(-5) Omega m is obtained at a certain oxygen supply into the deposition process. Hall effect measurements of these films reveal a metallic-like behavior from mobility and carrier concentration vs. temperature in the range 15-300 K whereas films deposited without oxygen or for the highest oxygen flows behave as semiconductors. These enhanced electrical properties are connected to the oxygen vacancies and the local coordination structure around the In3+ cations.
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| 8. |
- Nyberg, Tobias, et al.
(författare)
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Macromolecular nanoelectronics
- 2002
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Ingår i: Current applied physics. - 1567-1739 .- 1878-1675. ; 2:1, s. 27-31
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Tidskriftsartikel (refereegranskat)abstract
- We have explored new organic materials and fabrication methods to fabricate organic photodiodes and light emitting diodes. Grafting of a fullerene derivative to a polythiophene backbone yielded an integrated acceptor-donor polymer that we used as the active material in organic photodiodes. Using a method of soft lithography. soft embossing, we fabricated submicron structures to be used as organic light emitting diodes. Employing a silicone rubber replica (stamp) of an optical diffraction grating we transferred the grating pattern to an organic resist layer by placing the stamp in conformal contact with the resist. The transferred pattern was subsequently used as an etch mask for the processing of the device. The structures were successfully utilized as light emitting diodes and photodiodes, with device characteristics influenced by the imposed structure. (C) 2002 Published by Elsevier Science B.V.
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| 9. |
- Valiullin, Rustem, et al.
(författare)
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Liquid-liquid phase separation in micropores
- 2004
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Ingår i: Current applied physics. - : Elsevier BV. - 1567-1739 .- 1878-1675. ; 4:2-4, s. 370-372
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Tidskriftsartikel (refereegranskat)abstract
- Phase separation of binary liquids with an upper critical temperature in porous materials is studied by H-1 NMR cryoporometry and cross-relaxation spectroscopy and by N-15 NMR spectroscopy. The first method provides domain size distributions of the separating minority component while the other ones verify the segregation of the two liquids on molecular level. We find that metastable structures are formed manifested by bimodal domain size distributions. The kinetic arrest of domain growth may be imposed upon by bottlenecks in the porous structure that block diffusion of entire droplets. Practical applications, if one of the liquid components is polymerized, include mobile polymer particles trapped in porous matrix that can serve, e.g., as filters with microscopically amphiphilic pathways.
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| 10. |
- Andreasson, Måns, 1975, et al.
(författare)
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Porphyrin doping of Alq3 for electroluminescence
- 2008
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Ingår i: Current Applied Physics. - 1567-1739. ; 8, s. 163-166
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Tidskriftsartikel (refereegranskat)abstract
- Organic light emitting devices based on tris(8-hydroxyquinoline)aluminium (Alq3) doped with two fluorescent porphyrin derivatives,5,15-diphenyl-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphyrin and the corresponding zinc metalated one, were fabricated. As a consequence,the light emission changed, from standard green light from Alq3, to reddish and yellowish white respectively. The differentspectral content in the two cases indicates a possible route to a white light emitter, based on several dopants from the same family ofmolecules with different central atoms. The turn-on voltage of the devices was not increased by the doping.
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