The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Douglas E. Wolfe - One of the best experts on this subject based on the ideXlab platform.
-
erosion indicating thermal barrier coatings using luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
-
Erosion‐Indicating Thermal Barrier Coatings Using Luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
Jeffrey I. Eldridge - One of the best experts on this subject based on the ideXlab platform.
-
erosion indicating thermal barrier coatings using luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
-
Erosion‐Indicating Thermal Barrier Coatings Using Luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
Fabrice Gourbilleau - One of the best experts on this subject based on the ideXlab platform.
-
Confined phase separation in SiO$_X$ nanometric thin layers
Applied Physics Letters, 2013Co-Authors: M. Roussel, Fabrice Gourbilleau, E. Talbot, Cristelle Pareige, R.p. Nalini, Philippe PareigeAbstract:Phase separation in silicon-rich silica/silica multilayers was investigated using Atom Probe Tomography and Atomistic Kinetic Monte Carlo simulation. It is shown that the thickness of silicon-rich silicon oxide Sublayers plays an important role during phase transformation. It determines the morphology of Si-rich phase formed after subsequent annealing, which is of prime interest for microelectronic and optoelectronic applications. Monte Carlo simulation reveals that the formation of isolated Si clusters can be achieved even in the case of spinodal decomposition and is directly related to the ratio between the spinodal wavelength and the sublayer thickness.
-
SiOx /SiNy multilayers for photovoltaic and photonic applications
Nanoscale Research Letters, 2012Co-Authors: Ramesh Pratibha Nalini, Julien Cardin, Christian Dufour, Marzia Carrada, Larysa Khomenkova, Olivier Debieu, Fabrice GourbilleauAbstract:Microstructural, electrical, and optical properties of undoped and Nd 3+-doped SiO x /SiN y multilayers fabricated by reactive radio frequency magnetron co-sputtering have been investigated with regard to thermal treatment. This letter demonstrates the advantages of using SiN y as the alternating sublayer instead of SiO 2. A high density of silicon nanoclusters of the order 10 19 nc/cm 3 is achieved in the SiO x Sublayers. Enhanced conductivity, emission, and absorption are attained at low thermal budget, which are promising for photovoltaic applications. Furthermore, the enhancement of Nd 3+ emission in these multilayers in comparison with the SiO x /SiO 2 counterparts offers promising future photonic applications. PACS: 88.40.fh (Advanced materials development), 81.15.cd (Deposition by sputtering), 78.67.bf (Nanocrystals, nanoparticles, and nanoclusters).
-
Enhancing The Optical And Electrical Properties of Si-based Nanostructured Materials
Energy Procedia, 2011Co-Authors: Ramesh Pratibha Nalini, Philippe Marie, Julien Cardin, Christian Dufour, Panagiotis Dimitrakis, Pascal Normand, Marzia Carrada, Fabrice GourbilleauAbstract:Multilayer structures of Si rich silicon oxide (SiOx) alternated with two types of dielectric Sublayers viz. SiO2 or SiNx have been studied. An enhancement in the density of nanoclusters within the SiOx sublayer is achieved by using the reactive magnetron co-sputtering method. The effect of SiNx sublayer thickness on the photoluminescence properties is investigated. We succeed in enhancing the absorption and the pholuminescence properties of the multilayers by replacing SiO2 by SiNx Sublayers. We also achieve a higher conductivity in SiOx/SiNx with an improved thermal budget. This preliminary study gives a deep insight to optimize materials for future solar cell device applications with enhanced properties at reduced thermal budget.
-
The silicon-silicon oxide multilayers utilization as intrinsic layer on pin solar cells
Thin Solid Films, 2008Co-Authors: Héloïse Colder, Philippe Marie, Fabrice GourbilleauAbstract:Silicon nanostructures are promising candidate for the intrinsic layer on pin solar cells. In this work we report on new material: silicon-rich silicon oxide (SRSO) deposited by reactive magnetron sputtering of a pure silica target and an interesting structure: multilayers consisting of a stack of SRSO and pure silicon oxide layers. Two thicknesses of the SRSO sublayer, tSRSO, are studied 3 nm and 5 nm whereas the thickness of silica sublayer is maintaining at 3 nm. The presence of nanocrystallites of silicon, evidenced by X-Ray diffraction (XRD), leads to photoluminescence (PL) emission at room temperature due to the quantum confinement of the carriers. The PL peak shifts from 1.3 eV to 1.5 eV is correlated to the decreasing of tSRSO from 5 nm down to 3 nm. In the purpose of their potential utilization for i-layer, the optical properties are studied by absorption spectroscopy. The achievement a such structures at promising absorption properties. Moreover by favouring the carriers injection by the tunnel effect between silicon nanograins and silica Sublayers, the multilayers seem to be interesting for solar cells.
Jogender Singh - One of the best experts on this subject based on the ideXlab platform.
-
erosion indicating thermal barrier coatings using luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
-
Erosion‐Indicating Thermal Barrier Coatings Using Luminescent Sublayers
Journal of the American Ceramic Society, 2006Co-Authors: Jeffrey I. Eldridge, Jogender Singh, Douglas E. WolfeAbstract:A successful approach to producing thermal barrier coatings (TBCs) that are self-indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron-beam physical vapor-deposited (EB-PVD) TBCs consisting of 7 wt% yttria-stabilized zirconia (7YSZ) with europium-doped and terbium-doped Sublayers. Multiple-ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB-PVD TBCs their desirable strain tolerance. TBC-coated specimens were subjected to alumina-particle-jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the Sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion-indicating capability even after annealing free-standing TBCs at 1400°C for 100 h.
A V Novikov - One of the best experts on this subject based on the ideXlab platform.
-
gigantic uphill diffusion during self assembled growth of ge quantum dots on strained sige Sublayers
Applied Physics Letters, 2010Co-Authors: Ya M Valakh, P M Lytvyn, A S Nikolenko, V V Strelchuk, Z F Krasilnik, D N Lobanov, A V NovikovAbstract:Raman spectroscopy and atomic-force microscopy were applied to study the morphology of nanoislands grown on strained Si1−xGex Sublayers. It was shown that the growth of nanoislands on strained Si1−xGex sublayer not only induces the effect of their spatial ordering but also enhances the role of interdiffusion processes. Unusual high island volume increase during the epitaxy is explained by anomalous strong material diffusion from the sublayer into the islands, induced by nonuniform field of elastic strains.
