| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Guina, Mircea
Tampere University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (36/36 displayed)
- 2024Bridging the gap between surface physics and photonicscitations
- 2024Detection of BiGa hetero-antisites at Ga(As,Bi)/(Al,Ga)As interfacescitations
- 2023Tuneable Nonlinear Spin Response in a Nonmagnetic Semiconductor
- 2022Luminescent (Er,Ho)2O3 thin films by ALD to enhance the performance of silicon solar cellscitations
- 2021Luminescent (Er,Ho)2O3 thin films by ALD to enhance the performance of silicon solar cellscitations
- 2021Room-temperature electron spin polarization exceeding 90% in an opto-spintronic semiconductor nanostructure via remote spin filteringcitations
- 2021Room-temperature electron spin polarization exceeding 90% in an opto-spintronic semiconductor nanostructure via remote spin filteringcitations
- 2019Optimization of Ohmic Contacts to p-GaAs Nanowirescitations
- 2019Optimization of Ohmic Contacts to p-GaAs Nanowirescitations
- 2019Thermophotonic cooling in GaAs based light emitterscitations
- 2019V-groove etched 1-eV-GaInNAs nipi solar cellcitations
- 2019Observation of local electroluminescent cooling and identifying the remaining challenges
- 2019Gradients of Be-dopant concentration in self-catalyzed GaAs nanowirescitations
- 2019Influence of ex-situ annealing on the properties of MgF2 thin films deposited by electron beam evaporationcitations
- 2018Surface doping of GaxIn1−xAs semiconductor crystals with magnesiumcitations
- 2017The role of epitaxial strain on the spontaneous formation of Bi-rich nanostructures in Ga(As,Bi) epilayers and quantum wellscitations
- 2017Structured metal/polymer back reflectors for III-V solar cells
- 2017Photo-acoustic Spectroscopy of Resonant Absorption in III-V Semiconductor Nanowires
- 2016High-efficiency GaInP/GaAs/GaInNAs solar cells grown by combined MBE-MOCVD techniquecitations
- 2016Determination of composition and energy gaps of GaInNAsSb layers grown by MBEcitations
- 2016Optical Energy Transfer and Loss Mechanisms in Coupled Intracavity Light Emitterscitations
- 2016Combined MBE-MOCVD process for high-efficiency multijunction solar cells
- 2016High efficiency multijunction solar cells: Electrical and optical properties of the dilute nitride sub-junctions
- 2016Spontaneous formation of three-dimensionally ordered Bi-rich nanostructures within GaAs1-xBix/GaAs quantum wellscitations
- 2015Defects in dilute nitride solar cells
- 2015Spontaneous formation of nanostructures by surface spinodal decomposition in GaAs1-xBix epilayerscitations
- 2015Dilute nitrides for boosting the efficiency of III-V multijunction solar cells
- 2015Detecting lateral composition modulation in dilute Ga(As,Bi) epilayerscitations
- 2015Te-doping of self-catalyzed GaAs nanowirescitations
- 2015Oxidation of the GaAs semiconductor at the Al2O3/GaAs junctioncitations
- 2015Oxidation of the GaAs semiconductor at the Al2O3/GaAs junctioncitations
- 2014Unveiling and controlling the electronic structure of oxidized semiconductor surfaces: Crystalline oxidized InSb(100)(1 × 2)-Ocitations
- 2012Dilute nitride and GaAs n-i-p-i solar cellscitations
- 2011Characterization of InGaAs and InGaAsN semiconductor saturable absorber mirrors for high-power mode-locked thin-disk laserscitations
- 2011Ultrathin (1*2)-Sn layer on GaAs(100) and InAs(100) substrates:A catalyst for removal of amorphous surface oxidescitations
- 2008Passively Q-switched Tm3+, Ho3+-doped silica fiber laser using a highly nonlinear saturable absorber and dynamic gain pulse compressioncitations
Places of action
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article
Influence of ex-situ annealing on the properties of MgF2 thin films deposited by electron beam evaporation
Abstract
We report on the properties of magnesium fluoride (MgF2) thin films deposited by electron beam evaporation as a function of substrate deposition temperature and ex-situ annealing temperature. In particular, we report on the dependence of refractive index on annealing temperature, which can be used as a tuning parameter of the optical properties. Mechanical and structural properties of the films influenced by the annealing are also examined. Changing the substrate temperature from 50 °C to 240 °C caused a decrease of the refractive index and the lowest value of 1.36 (measured at 632.8 nm) was achieved for the substrate temperature of 240 °C. Rapid thermal annealing further decreased the refractive indices to slightly below 1.32. This could indicate increase in the film porousness and removal of adsorbed water molecules. Prior annealing the film surfaces were very smooth with root mean square and mean roughness below 1 nm. Annealing above 700 °C changed the structure of the films drastically, as they started to form a granular structure, while an annealing temperature of 1000 °C increased the refractive index to a value as high as 1.5. Using X-ray photoelectron spectroscopy we show that the surface of the films consist mainly of Mg and F atoms, but also small traces of C and O are present. The Mg:F ratio remained essentially the same (43:57) between different deposition temperatures. To demonstrate the need for post-deposition annealing treatment, we have also studied the aging effect in the MgF2 based anti-reflective coatings.