Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Vicent López, José Luis ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Dieguez, E. | Elsevier Science B.V. | 2006-08-01Dilute Te-doped GaSb alloys have been prepared by the vertical feeding method (VFM) using both casting and feeding configurations. The structural and optical properties of the samples were characterized by etching, X-ray diffraction and cathodol[...]![]()
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Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco ; De Diego, N. | Amer Inst Physics | 1988-11-01Cathodoluminiscence (CL) scanning electron microscopy and positron annihilation techniques have been used to investigate the distribution of defects in GaAs: Te wafers. Dislocation density and near-band-edge CL profiles along the wafer have di[...]![]()
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Pal, U. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Serrano, M. D. ; Dieguez, E. | IOP publishing ltd | 1994The nature of the 1.4eV band in CdTe is studied by cathodoluminescence. Results indicate that the band is not related only to surface defects.![]()
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Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco ; Monteiro, T. ; Pereira, E. | Elsevier Science SA | 1993-09Cathodoluminescence (CL) from untreated as well as heat-treated GaP:Te:Mn samples has been investigated. Spectra of untreated samples present two emission bands that peak at 585 and 730 nm. The CL image shows bright spots associated with disloca[...]![]()
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Castaldini, A. ; Calvallini, A,. ; Fraboni, B ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Amer Inst Physics | 1994-07-15The distribution in liquid-encapsulated-Czochralski (LEC) GaAs:Te wafers of point and complex defects has been investigated together with their influence on the minority-carrier diffusion length L. Three wafers with different Te-doping concentra[...]![]()
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Cavallini, A. ; Dupasquier, A. ; Ferro, G. ; Piqueras de Noriega, Javier ; Valli, M. | Trans Tech Publications Ltd | 1997The radial vacancy distribution along a LEC-GaAs:Te wafer with an average free carrier concentration n = 1.5 x 10(18) cm(-3) was studied by means of positron lifetime spectroscopy. An M-shaped radial distribution of vacancy-like defects, most pr[...]![]()
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Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier ; De Diego, N. ; LLopis, J. | American Institute of Physics | 1988-04-15Cathodoluminescencescanning electron microscopy and positron annihilation techniques have been used to investigate the distribution of defects in GaP wafers. The results show the existence of a gradient of the concentration of vacancy?type defec[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Popa, V. ; Cojocaru, A. ; Tiginyanu, M. | Amer Inst Physics | 2005-05-30The emission properties of GaN nanostructures created by photoelectrochemical etching have been investigated by cathodoluminescence (CL) in the scanning electron microscope. Columnar structures with diameters of 150-250 nm formed near the surfac[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R. | Materials Research Society | 2003Electrically active regions of nanocrystalline silicon (nc-Si) films as well as of a p-type crystalline silicon (c-Si) wafer have been investigated by using a scanning electron microscope/scanning tunneling microscope (SEM/STM) combined instrume[...]![]()
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Díaz-Guerra Viejo, Carlos ; Chioncel, M. ; Piqueras de Noriega, Javier | Academic Press LTD-Elsevier Science LTD | 2009-04Nanostructures of two transition metal oxides, WO(3) and ?-Fe_2O_3, have been grown by a thermal deposition method without a catalyst and characterized by x-ray diffraction, scanning electron microscopy (SEM), high-resolution transmission electr[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2007-10-15V_2O_5 nanostructures have been grown on 4H-SiC and Si substrates by a thermal deposition method without a catalyst. High aspect ratio nanowires with rectangular cross sections were grown on 4H-SiC. High-resolution transmission electron microsco[...]![]()
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Díaz-Guerra Viejo, Carlos ; Montone, A. ; Piqueras de Noriega, Javier ; Cardellini, F. | IOP publishing ltd | 2002-01The structural and luminescent properties of nanocrystalline silicon produced by high-energy ball milling of Si single crystals have been investigated using transmission electron microscopy (TEM), x-ray diffraction (XRD) and cathodoluminescence [...]![]()
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Tomashpolskii, Y. Y. ; Sadovskaya, N. V. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Opagiste, C. | Amer Inst Physics | 1997-03The structural changes and the cation and anion compositions of the surface of superconducting YBa_2Cu_3O_(7-x) and Tl_2Ba_2CuO_(6+x) ceramics after local irradiation for several seconds by an electron probe with an accelerating voltage of 25 kV[...]![]()
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Rodríguez Fernández, José ; Carcelen, V. ; Hidalgo Alcalde, Pedro ; Vijayan, N. ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Pérez, J. M. ; Dieguez, E. | Institute of Physics | 2004-01-21The cathodoluminescence (CL) technique is used to analyse the radiative recombination properties of four distinct silicon carbide (SiC) samples: a 6H-SiC n^+ -type Lely wafer, two off-axis 4H-SiC epitaxial layers of n type and p type, and a (11 [...]![]()
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A series of 100 nm thick InGaN films with Indium content up to 14% has been grown by MOVPE on SiC substrates. Cathodoluminescence (CL) and remote electron beam induced current (REBIC) in the scanning electron microscope have been applied to inve[...]![]()
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The effect of Cl doping on the luminescence properties of CdTe is investigated by cathodoluminescence microscopy. Cl enhances the 1.4 eV emission and retards the appearance of the tellurium vacancy related emission band. The behaviour under anne[...]![]()
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Cremades Rodríguez, Ana Isabel ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1993-11-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study the upper surface and cross-sectional samples of chemical vapor deposited diamond films. The CL emission is mainly localized at the grain boundaries of the colum[...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-03-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study cross-sectional samples on GaN epitaxial films grown on sapphire. Increased CL emission, attributed to the presence of stacking faults and decorated dislocations[...]![]()
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Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Cavallini, A. ; Fraboni, B. | Elsevier Science SA Lausanne | 1994-05Evidence for IR cathodoluminescence (CL) at 1.2 and 1.0 eV in Te-doped GaAs in the temperature range 80-300 K has been obtained. The evolution of CL intensity and half-width of emission bands after silicon implantation and annealing has been inv[...]![]()
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Díaz-Guerra Viejo, Carlos ; Chioncel, M. F. ; Vincent, J ; Bermudez, V. ; Piqueras de Noriega, Javier ; Dieguez, E. | Wiley-V C H Verlag Gmbh | 2005The homogeneity and luminescence properties of undoped and Te-doped In_xGa_(1-x)Sb crystals grown by the Bridgman and Vertical Feeding methods have been studied by cathodoluminescence (CL) and X-ray microanalysis in a scanning electron microscop[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P: S. | Materials Research Society | 2000GaSb p-n junctions formed by Zn diffusion in Te-doped n-GaSb single crystalline wafers have been characterized by cathodoluminescence (CL) microscopy and by scanning tunneling spectroscopy. CL plane-view observations of the Zn diffused side enab[...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2001-07-15Remote electron beam induced current (REBIC) measurements have been carried out to investigate electrically active regions in Si doped GaN films. REBIC bright-dark contrast has been observed in the border of growth, round or pyramidal, hillocks,[...]![]()
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Cebriano Ramírez, Teresa ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Springer | 2012-10Luminescence of micro-and nanotriangles of cubic antimony oxide, Sb_2O_3 has been investigated by cathodoluminescence (CL) in scanning electron microscope and by photoluminescence (PL) in a laser confocal microscope. The triangles were grown by [...]![]()
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Scanning electron acoustic microscopy (SEAM) has been used in the observation of domain walls in iron- and cobalt-based amorphous alloys ribbons. Controlled magnetic annealing experiments enabled the direct identification of domain walls in SEAM[...]![]()
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Magdas, D.A. ; Malestre, D. ; Cremades Rodríguez, Ana Isabel ; Gregorati, Luca ; Piqueras de Noriega, Javier | Academic Press Ltd- Elsevier Science Ltd | 2009-04In this work sintered thick microcrystalline films as well as micro and nanostructures of In(2)O(3) have been studied. The results obtained by XPS microscopy show that the boundary regions of the microcrystalline films present a higher amount of[...]![]()
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Herrera, M. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Stutzmann, M. ; Ambacher, O. | American Institute of Physics | 2004-11Cathodoluminescence (CL) in the scanning electron microscope and atomic force microscopy (AFM) have been used to study the formation of pinholes in tensile and compressively strained AlInGaN films grown on Al2O3 substrates by plasma-induced mole[...]![]()
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Pal, U. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Serrano, M. D. ; Dieguez, E. | American Institute of Physics | 1994-09-15Cathodoluminescence in the scanning electron microscope has been used to investigate the relationship of point defects in CdTe and CdTe:V with luminescence bands at 1.40 and 1.13 eV. V has been found to inhibit the 1.40 eV luminescence. Annealin[...]![]()
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Garcia, J. A. ; Remon, A. ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | Elsevier Science SA | 1991-07The spectral emission of GaP:S in the range 1.5- 2.1eV (800-600nm) has been studied by cathodoluminescence in the scanning electron microscope and by photoluminescence. In as-grown samples the spectra show two bands centered at about 700-730 and[...]![]()
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Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Vicent López, José Luis | Amer Inst Physics | 1990-12-17Changes in the visible and infrared cathodoluminescence(CL)spectra of YBa2Cu3O7?x are detected during irradiation in the scanning electron microscope. Results indicate the influence of oxygen content on the appearance of a CL band at 450–600 nm.[...]![]()
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Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Albrecht, M. ; Stutzmann, M. ; Strunk, H.P. | Elsevier Science SA | 2002-03-22InGaN quantum well (QW) structures with different thicknesses have been characterised by means of cathodoluminescence (CL) in the scanning electron microscope and transmission electron microscopy (TEM), in order to study the structural defects t[...]![]()
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Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-08-20The effect of mechanical milling on the structure and luminescent properties of CdSe powder has been investigated by means of cathodoluminescence (CL) in the scanning electron microscope, transmission electron microscopy (TEM) and x-ray diffract[...]![]()
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Plaza, J. L. ; Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dieguez, E. | Elsevier Science SA | 2002-04-30The defect structure of Te-doped GaSb samples co-doped with Er_2O_3 and grown by the vertical Bridgman technique has been analysed. This study was carried out for different Er and Te concentrations. The defect structure of the samples has been a[...]![]()
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Maestre Varea, David ; Ramírez Castellanos, Julio ; Hidalgo Alcalde, Pedro ; Cremades Rodríguez, Ana Isabel ; Gónzalez Calbet, J.M. ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2007-04The defect structure of sintered SnO_2 was investigated by high-resolution transmission electron microscopy (HRTEM), cathodoluminescence (CL), and electrical measurements. HRTEM shows the presence of the SnO phase in the sintered samples as well[...]![]()
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Crocco, J. ; Bensalah, H. ; Zheng, Q. ; Dierre, F. ; Hidalgo Alcalde, Pedro ; Carrascal, J. ; Vela, O. ; Piqueras de Noriega, Javier ; Dieguez, E. | IEEE-Inst Electrical Electronics Engineers Inc | 2011-08The Vertical Gradient Freeze (VGF) method has been used to grow high resistivity Cadmium Zinc Telluride (CZT) for high energy radiation applications. In this work, the effect of lapping and polishing the lateral edges of planar detectors is stud[...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science B.V. | 2009-02-01A study of the variation of structural and optical properties of different SnO2 micro- and nanostructures grown by thermal treatments including a post-growth annealing under argon flow has been carried out. The samples have been characterized by[...]![]()
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López, Iñaqui ; Lorenz, K. ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Alves, E. ; Garcia, J. A. | Springer | 2014-02A systematical analysis of the correlation between the crystalline quality and the luminescence of rare-earth-implanted ß-Ga_2O_3 nanostructures with potential applications in visible and ultraviolet photonics is presented. Europium ions led to [...]![]()
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Plugaru, R. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Tate, T.J. | Institute of Physics | 2002-12-16Visible luminescence of amorphous silicon layers either implanted with Er or co-implanted with Er and O and subsequently annealed in nitrogen has been investigated by cathodoluminescence (CL) in a scanning electron microscope. Co-implanted sampl[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P: S. | Elsevier Science SA | 2001-03-22We report here the studies carried out in zinc diffused n-type GaSb by cathodoluminescence (CL) microscopy and by scanning tunneling spectroscopy. Samples with different diffusion profiles measured by secondary ion mass spectrometry (SIMS) were [...]![]()
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Plugaru, R. ; Vasilco, R. ; Piqueras de Noriega, Javier ; Cremades Rodríguez, Ana Isabel | IEEE | 2003Polyerystalline TiO2 surface reconstruction in oxygen atmosphere has been investigated by atomic force microscopy (AFM) and cathodoluminescence in the scanning electron microscopy (SEM-CL). The reactivity to oxygen is related to the presence of [...]![]()
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Piqueras de Noriega, Javier ; Díaz-Guerra Viejo, Carlos ; Umek, Polona ; Gloter, Alexandre | American Chemical Society | 2010-05-13We report on the synthesis of Cr^3^+-doped sodium titanate nanotubes and nanoribbons by a hydrothermal method. The presence of dopant ions in these nanostructures was confirmed by high angle annular dark field scanning transmission electron micr[...]![]()
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Díaz-Guerra Viejo, Carlos ; Umek, Paloma ; Gloter, Alexandre ; Piqueras de Noriega, Javier | Elsevier Science BV | 2010-05-13We report on the synthesis of Cr^(3+)-doped sodium titanate nanotubes and nanoribbons by a hydrothermal method. The presence of dopant ions in these nanostructures was confirmed by high angle annular dark field scanning transmission electron mic[...]![]()
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Mitric, A. ; Corregidor, V. ; Alves, L. C. ; Amariei, A. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | Elsevier Science B.V. | 2005-02-15GaSb and GaInSb compounds were synthesised from the component elements using a new technique. The effect of the electro-magnetic induction on the conductor materials is used in order to heat, melt and mix the Ga, Sb and In elements. The homogene[...]![]()
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Diaz, Joquín ; López, Iñaki ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Springer | 2011-05Silicon-doped gallium oxide nanowires have been synthesized by thermal methods using either a mixture of gallium oxide and silicon powders or metallic gallium with silicon powder as precursor materials. The growth mechanism has been found to be [...]![]()
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Maestre Varea, David ; Hernandez, Elena ; Cremades Rodríguez, Ana Isabel ; Matteo, Amati ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2012-05Microtubes of Er-doped SnO2, as well as nanorods and nanoparticles, have been fabricated by a thermal evaporation deposition method at temperatures between 1400 and 1500 degrees C, by using a pellet of compacted SnO2 and Er2O3 powder mixture as [...]![]()
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Méndez Martín, Bianchi ; López, I. ; Alonso Orts, Manuel ; Sanz, A. ; Nogales Díaz, Emilio ; Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier | Spie-Int Soc Optical Engineering | 2017-05-30The synthesis of complex nanostructures that combine materials and dimensionality, promises the ability to identify novel designs and architectures with enhanced properties that could be used in new devices. One of the building blocks in nanomat[...]![]()
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Vincent López, José Luis ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Dieguez, E. | Amer Inst Physics | 2007In this work, the experimental set-up of the Vertical Feeding Method (VFM) which has been used for the preparation of GaSb and GaInSb materials is presented. The different elements of the set-up are detailed as well as the preparation process. T[...]![]()
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The variation of the electron acoustic signal as a function of temperature in ceramic materials has been studied. Scanning electron acoustic microscopy (SEAM) contrast in MgO single crystals and in reaction bonded SiC, between 100 and 273 K, is [...]![]()
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Peche Herrero, M. A. ; Maestre Varea, David ; Ramirez Castellanos, J. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Gonzalez Calvet, J. M. | RSC Royal Society of Chemistry | 2014SnO_2 nanoparticles doped with transition metals (V, Cr, Mn) have been synthesized by both the hydrothermal method (HDT) in a basic media and the liquid mixed method (LQM) based on the Pechini method. Nanocrystalline particles obtained via a liq[...]