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Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Superconducting Tl_2Ba_2Cu_1O(6+?) ceramics shows two broad luminescence bands centered at 430 nm (2.9 eV) and 530 nm (2.3 eV) wich can not be related to impurity phases. The intensity of the bands is inhomogeneously distributed in the sample an[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Polenta, L. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | Elsevier Science SA | 2002-04-30Technological improvement of GaN-based devices for electronic and optoelectronic applications makes essential both monitoring and controlling point and extended defects, which can have detrimental effects in device performance. For gallium nitri[...]texto impreso
Vincent, J. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Amariei, A. ; Polychronladis, E.K. ; Dieguez, E. | Elsevier Science B.V. | 2006-03-15Undoped and Te-doped GaSb ingots have been grown by the vertical feeding method. The structural, optical and electrical properties of the grown crystals were respectively investigated by X-ray diffraction, transmission electron microscopy, catho[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Amer Inst Physics | 1997We have investigated the electrical and optical properties of the deep levels responsible for the 1.4-1.5 eV luminescence band usually observed in II-VI compounds. We compared the energy levels found by cathodoluminescence and junction spectrosc[...]texto impreso
Castaldini, A. ; Cavallini, A: ; Fraboni, B. ; Polenta, L. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Elsevier Science SA | 1996-12-15We have investigated deep levels in semiconducting and semi-insulating II-VI compounds, namely undoped CdTe, CdTe:Cl and CdZnTe, in order to understand their role in the compensation mechanisms. To this aim Lye have utilized both junction spectr[...]texto impreso
Maestre Varea, David ; Haeussler, D. ; Cremades Rodríguez, Ana Isabel ; Jaeger, W. ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-09-22Sn-doped In2O3 arrow-shaped nanorods have been grown by a catalyst-free evaporation deposition method. Transmission electron microscopy (TEM) investigations reveal a complex defect structure consisting of nanoprecipitates, dislocation loops, and[...]texto impreso
Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Jäger, Wolfgang ; Häußler , Dietrich | Wiley-V C H Verlag Gmbh | 2012-08Al-doped micro- and nanostructures have been grown by an evaporation–deposition method with a mixture of ZnS and Al_2O_3 powders as precursor. It has been found that the presence of Al is the cause of the growth of complex morphologies, as rods [...]texto impreso
Fernández Sánchez, Paloma ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier ; Armelles, G. | Pergamon-Elsevier Science Ltd | 1990-10Cathodoluminescence of AlxGa1?xP has been investigated for x between 0.10 and 0.53. A band corresponding to the 610 nm band of pure GaP has been found to shift to higher energies with increasing x. The position of a red band centred at 690 nm is[...]texto impreso
Bartolomé Vílchez, Javier ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Amatti, M. ; Piqueras de Noriega, Javier | Pergamon-Elsevier Science Ltd | 2013-04Microrods and hierarchical structures of indium-zinc-oxide (IZO) with different compositions were grown by thermal treatments of mixtures of InN and ZnO powders. In long rods, an increase in Zn content along the growth axis is revealed by energy[...]texto impreso
Plaza, J. L: ; Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dieguez, E. | Elsevier Science B.V. | 2002-06Nd-doped GaSb bulk crystals with three different dopant concentrations have been grown by the vertical Bridgman technique. The axial segregation has been characterised by obtaining the effective segregation coefficient. Differences in the value [...]texto impreso
Pereira, L. ; Pereira, E. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science SA | 1996-08Flame grown diamond films on a molibdenium substrate are characterised by cathodoluminescence (CL), photoluminescence (PL), micro-Raman and scanning electron microscopy in the emissive mode. Different crystal habit regions grow with an annular s[...]texto impreso
Piqueras de Noriega, Javier ; Panin, G.N. ; Díaz-Guerra Viejo, Carlos ; Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi | Trans Tech-Scitec Publications LTD | 1998The use of combined SEM/STM instruments enables to position the tunnel tip in the region of the sample to be investigated by STM or/and by scanning tunneling spectroscopy (STS). In this work a STM has been implemented in the chamber of a SEM pro[...]texto impreso
Sotillo Buzarra, Belén ; Escalante, G. ; Radoi, C. ; Muñoz San José, V. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma | American Institute of Physics | 2019-12-14The effect of plastic deformation on the optical and structural properties of ZnSe crystals has been investigated. The optical properties have been monitored by cathodoluminescence measurements as a function of the deformation degree. Remarkable[...]texto impreso
Cristian Vasquez, G. ; Andrea Peche-Herrero, M. ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Ramirez-Castellanos, Julio ; Gonzalez-Calbet, José M. ; Piqueras de Noriega, Javier | RSC Royal Society of Chemistry | 2013Cr doped TiO_2 rutile nanoparticles have been used as precursor of microrods and microtubes grown by a vapor-solid method. The grown microstructures have nearly square cross-sections of a few microns wide and lengths of up to about 100 microns. [...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Materials Research Society | 1998Cathodoluminescence (CL) in the scanning electron microscope has been used to investigate the variation along the growth axis direction of luminescence emission from epitaxial GaN films. CL spectra recorded at different positions of the sample c[...]