Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Golubev, VG. ; Kurdyukov, D.A. ; Pevtsov, A. B. | American Institute of Physics | 2001-10-01Synthetic opals infilled with silicon (opal-Si) and with Si and Pt (opal-Pt-Si) have been irradiated in a scanning electron microscope under high excitation conditions. Electron irradiation-induced changes in the morphology and luminescent defec[...]texto impreso
Cheze, C. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Corregidor, V. | natl Inst Optoelectronics | 2006-02Quaternary Ga_(1-x)In_xAs_ySb_(1-y) layers lattice matched to a GaSb substrate are of interest for applications in the infrared range. In this work, the luminescence of Ga_(1-x)In_xAs_ySb_(1-y) layers grown on GaSb by metal organic vapor phase e[...]texto impreso
Piqueras de Noriega, Javier ; Sotillo Buzarra, Belén ; Fernández Sánchez, Paloma | Elsevier Science SA | 2013-06-25Vapor–solid (VS) growth method at temperatures in the range from 1000 °C to 1200 °C has been used to obtain In doped ZnS micro- and nanostructures. The morphologies of the synthesized structures depend strongly on the deposition temperature, con[...]texto impreso
Nogales Díaz, Emilio ; Hidalgo Alcalde, Pedro ; Lorenz, K. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Alves, E. | IOP publishing ltd | 2011-07-15Rare earth (RE) doped gallium oxide and germanium oxide micro- and nanostructures, mostly nanowires, have been obtained and their morphological and optical properties have been characterized. Undoped oxide micro- and nanostructures were grown by[...]texto impreso
Pal, U ; Piqueras de Noriega, Javier ; Dutta, P. S. ; Bhat, H. L. ; Dubey, G. C. ; Kumar, V. ; Dieguez, E. | Materials Research Soc | 1996texto impreso
Méndez Martín, Bianchi ; Dutta, P. S. ; Piqueras de Noriega, Javier ; Dieguez, E. | Amer Inst Physics | 1995-10-30The homogeneity and luminescence properties of undoped bulk GaSb have been studied by the cathodoluminescence (CL) technique in the scanning electron microscope. CL images have revealed a nonuniform distribution of native defects in GaSb wafers [...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Solís, J. | American Institute of Physics | 1996-05-15Planarization of large grain diamond films has been induced by 193 nm excimer laser irradiation. Secondary emission images and cathodoluminescence (CL) in the scanning electron microscope have been used to characterize-the irradiated area. Irrad[...]texto impreso
Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Abellá, M. ; Saucedo, E. ; Dieguez, E. | Springer | 2008-08Bi doped and Bi and Yb codoped CdTe crystals grown by the Bridgman method have been characterized by cathodoluminescence (CL) in the scanning electron microscope. CL images show a dense network of highly decorated grain boundaries in the Bi dope[...]texto impreso
Fernández, I. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2005-02In this work, the effect of different surface orientations on the defect structure of TiO2 single crystals and the evolution of the luminescence properties under plastic deformation are investigated by cathodoluminescence (CL) microscopy. The ma[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Xavier, C. ; Monteiro, T. ; Pereira, E. ; Meyer, B.K. ; Hofmann, D. M. ; Fischer, S. | American Institute of Physics | 1996-12-15GaN epitaxial layers have been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM). The most prominent feature of the spectra is a complex band at 2.2 eV, whose evolution with temperature and excitation density sug[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Sanchez, M. ; Piqueras de Noriega, Javier ; Golubev, VG. | Wiley-V C H Verlag Gmbh | 2003-01In this study, three-dimensional ordered synthetic opals formed by spheres of 230 nm impregnated with GaN have been investigated. In some of the samples gold and platinum were also introduced. The potential applications of GaN-opal assemblies in[...]texto impreso
Chioncel, M. F. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Vincent, J. ; Bermudez, V. ; Dieguez, E. | Elsevier Science B.V. | 2004-07-15The nature and the spatial distribution of radiative defects in InxGa1-xSb grown by the vertical Bridgman method have been studied by cathodoluminescence (CL) in a scanning electron microscope. The CL results have been complemented by X-ray micr[...]texto impreso
Nogales Díaz, Emilio ; Sánchez, B. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Academic Press Ltd- Elsevier Science Ltd | 2009-04Isoelectronic (In, Al) doped gallium oxide nanowires have been grown by a vapour solidification process. XRD and TEM were used for their structural characterization. The morphology and optical properties of the In(Al)-doped Ga_2O_3 nanowires hav[...]texto impreso
Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Muñoz, V. ; Bernardi, S. | Amer Inst Physics | 1997-11-24CdTe(100)/GaAs(100) and CdTe(lll)/CdTe(lll) layers grown by metalorganic vapor phase epitaxy (MOVPE) were investigated The layers were recrystallized to improve their morphology by scanning the surface with a 100 mu m diameter spot from an Ar io[...]texto impreso
Cathodoluminescence study of semiconductor oxide micro- and nanostructures grown by vapor deposition
Piqueras de Noriega, Javier ; Maestre Varea, David ; Ortega Mallén, Yolanda ; Cremades Rodríguez, Ana Isabel ; Fernández Sánchez, Paloma | Wiley-Blackwell | 2008-07starting SnO_2, powder. In-rich nanoislands were found to grow on some edges of the tubes. ZnO nanostructures doped with Sri or Eu were grown by adding SnO_2 and Eu(2)O(3) powder, respectively, to the ZnO precursor powder. All the samples have b[...]texto impreso
Iribarren, A. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Springer Netherlands | 2008-04Sintering of a mixture of TeO_2 and ZnO powders under an Ar flux leads to the formation of elongated Te-doped ZnO nano- and microstructures on the sample surface. The growth of the structures occurs via a vapour-solid process. Cathodoluminescenc[...]texto impreso
Panin, G. ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Dieguez, E. | Elsevier Science SA | 1996-12-15The origin and spatial distribution of radiative defects in undoped and Ge-doped CdTe wafers have been studied by CL spectroscopy and imaging techniques in the scanning electron microscope (SEM) before and after the wafer annealing in HgI2 vapor[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Vincent, J. ; Piqueras de Noriega, Javier ; Bermudez, V. ; Dieguez, E. | American Institute of Physics | 2005-01-15The radiative recombination properties of Se-doped GaSb crystals grown by the Bridgman method have been investigated by cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope. A CL band centered at about 765 meV[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Ruiz, C. ; Bermudez, V. ; Piqueras de Noriega, Javier ; Dieguez, E. | Elsevier Science SA | 2005-07-25b-doped GaSb ingots have been grown by the Bridgman method. The defect structure and compositional homogeneity of the crystals have been investigated by cathodoluminescence and X-ray microanalysis in the scanning electron microscope. The nature [...]texto impreso
Pereira, L.. ; Pereira, E. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Jiménez, J. ; Bielza, J.M. | Elsevier Science SA | 1999-07Diamond and diamond-like films grown by the torch flame method have been analysed by different techniques, namely scanning electron microscopy, Raman spectroscopy, electron paramagnetic resonance and catholuminescence microscopy, in order to inv[...]texto impreso
Panin, G. N. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | Amer Inst Physics | 1998-04-21A correlative study of the electrically active defects of CdxHg1-xTe and CdTe crystals has been carried out using a scanning electron microscope/scanning tunneling microscope (SEM/STM) combined system. Charged structural and compositional defect[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1991-01-01Grain boundaries in GaP and InP have been studied by infrared cathodoluminescence (CL). In GaP the results indicate that there exists a depletion region beside grain boundaries where the concentration of P(Ga) antisite defects is lower than in t[...]texto impreso
texto impreso
StorgardsStorgards, J. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Storgards, M. ; Dimroth, F. ; Bett, A.W. | Institute of Physics | 2004-06-21The luminescence of GaSb and AlGaSb layers grown on GaAs substrates by metal organic vapour phase epitaxy has been studied by means of cathodoluminescence (CL) rising a scanning electron microscope. CL plane-view analysis reveals a distribution [...]texto impreso
texto impreso
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[...]texto impreso
Martínez Criado, Gema ; Segura Ruiz, Jaime ; Manh-Hung, Chu ; Tucoulou, Remi ; López García, Iñaki ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2014-10Crossed nanowire structures are the basis for high-density integration of a variety of nanodevices. Owing to the critical role of nanowires intersections in creating hybrid architectures, it has become a challenge to investigate the local struct[...]texto impreso
A combined scanning electron microscope-scanning tunneling microscope (SEM-STM) system has been used to investigate surface topographic and electronic properties of YBa2Cu3O7-x (YBCO) and Bi2Sr2Ca-Cu2O8+x (Bi-2212) single crystals. Current imagi[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P.S. ; Dieguez, E. | Pergamon-Elsevier Science Ltd | 1998The effect of aluminium on the defect structure of GaSb crystals, grown by the vertical Bridgman technique, has been investigated by cathodoluminescence (CL) in the scanning electron microscope. Crystals have been found to be highly homogeneous [...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-02-15The deep levels present in semiconducting CdTe and semi-insulating CdTe:Cl and Cd0.8Zn0.2Te have been investigated by means of cathodoluminescence, deep level transient spectroscopy (DLTS), photo-induced current transient spectroscopy, and photo[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Pal, U. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Akademie Verlag GMBH | 1995-01-16The effect of indentation on the cathodoluminescence (CL) of CdTe in the scanning electron microscope is investigated. Deformation produces deep level emission changes, in particular, a relative intensity increase of the 1.4 and 1.1 eV bands, ex[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Kurdyukov, D.A. ; Piqueras de Noriega, Javier ; Sokolov, V. I. ; Zamoryanskaya, M. V. | American Institute of Physics | 2001-03-01Synthetic opals-composed of 250 nm amorphous silica spheres closed packed in a face centered cubic structure-have been infilled with silicon, platinum, and with Si and different Pt contents. The luminescent properties of these composites have be[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Castaldini, A. ; Cavallini, A. ; Polent, L. | American Institute of Physics | 2003-12-15The electronic recombination properties of Mg-doped GaN have been investigated by steady state and time-resolved cathodoluminescence (TRCL) in the scanning electron microscope, photocurrent (PC) spectroscopy, and optical beam induced current (OB[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Piqueras de Noriega, Javier ; Polenta, L. | IOP publishing ltd | 1996The influence of deep levels on the electrical and optical properties of semiconductors is widely acknowledged. We have utilized several complementary spectroscopic techniques to investigate the deep traps in undoped CdTe, CdTe:Cl and Cd0.8Zn0.2[...]texto impreso
Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Urbieta Quiroga, Ana Irene ; Rebane, Y. T. ; Shrete, Y. | IOP publishing ltd | 1999-05The influence of defects, in particular the deformation-induced defects, on the luminescence of bulk ZnSe single crystals has been investigated by cathodoluminescence (CL) in the scanning electron microscope. Deformation has been found to cause [...]texto impreso
Aleman, A. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Elsevier Science B.V. | 2010-10-15Dense vertical arrays of indium doped ZnO nanoplates have been grown by thermal treatment of compacted ZnS-In_2O_3 powders with 0.35 at% of In. The distribution of nanoplates is related to the grain structure of the substrate. Only a small conte[...]