| 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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Lazaro, Roberto C. Ambrosio
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2022Discretization Approach for the Homogenization of Three-Dimensional Solid-Solid Phononic Crystals in the Quasi-Static Limit: Density and Elastic Modulicitations
- 2021Comparative Study on the Quality of Microcrystalline and Epitaxial Silicon Films Produced by PECVD Using Identical SiF4 Based Process Conditionscitations
- 2020Reduction of residual stress in polymorphous silicon germanium films and their evaluation in microbolometerscitations
- 2019Study of the effect of the deposition RF power on the characteristics of microcrystalline Silicon-Germanium thin films produced by PECVD
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article
Reduction of residual stress in polymorphous silicon germanium films and their evaluation in microbolometers
Abstract
<jats:p>Hydrogenated polymorphous silicon germanium (pm-Si<jats:sub><jats:italic>x</jats:italic></jats:sub>Ge<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>:H) thin films were deposited by the PECVD technique at 200 °C. Three compositions were investigated by changing the silane/germane gas mixture. It was found that the temperature coefficient of resistance (TCR) varies from 2.25% K<jats:sup>−1</jats:sup> to 4.26% K<jats:sup>−1</jats:sup> while the electrical conductivity ranges from 9.1 × 10<jats:sup>−6</jats:sup> S cm<jats:sup>−1</jats:sup> to 3.7 × 10<jats:sup>−3</jats:sup> S cm<jats:sup>−1</jats:sup>. On the other hand, the residual stress of as-deposited films was highly compressive reaching values of nearly 700 MPa. After a thermal annealing of 3 hours, it was observed an acceptable reduction and a slight change towards tensile stress. A thin film with low residual stress and high TCR was chosen to manufacture test microbolometers in order to assess if the thermosensing properties of pm-Si<jats:sub><jats:italic>x</jats:italic></jats:sub>Ge<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>:H were not affected. After fabricating the microbolometers, their structural conditions were evaluated by scanning electron microscopy and it was found that the reduction of stress significantly improved their mechanical stability and reduced the warping of the membranes. Finally, test structures were characterized at a chopper frequency of 30 Hz, with a DC current of 2.5 μA in a vacuum environment of 20 mTorr. Voltage responsivity of 1.9 × 10<jats:sup>6</jats:sup> V/W, detectivity of 4.4 × 10<jats:sup>8</jats:sup> cm ∙ Hz<jats:sup>1/2</jats:sup>/W, NEP of 1 × 10<jats:sup>−11</jats:sup> W/Hz<jats:sup>1/2</jats:sup>, NETD of 18 mK and 2 ms of thermal response time were measured. In summary, we have studied different process conditions to obtain better pm-Si<jats:sub><jats:italic>x</jats:italic></jats:sub>Ge<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>:H films in terms of their electrical and mechanical properties. In this sense, the results obtained with microbolometers show that pm-Si<jats:sub><jats:italic>x</jats:italic></jats:sub>Ge<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>:H is a very attractive material to develop infrared vision systems with high sensitivity.</jats:p>