Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Time-resolved photoluminescence spectroscopy at low temperatures is used to study the 2.3 eV emission induced by treatments causing oxygen loss in YBa_2Cu_3O_(7-x). The decay shows a biexponential behavior with components of 34 and 87 mus at 10 [...]![]()
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Alonso Orts, Manuel ; Sánchez, A. M. ; López, I. ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | RSC Royal Society of Chemistry | 2017-11-07In this work, a simple thermal evaporation method has been used to obtain a variety of Ga?O?/SnO? nano-assemblies with different shapes and dimensionalities, which may affect their physical properties, especially those influenced by surface prop[...]![]()
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Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2009-03-01Al doped ZnO arrays of nanoplates and of ordered nanoneedles have been grown by a thermal evaporation-deposition method. The nanoplates, which have mainly triangular shape. Interpenetrating triangles and crossing of the triangles with other plan[...]![]()
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Bruno, F. Y. ; Tornos, J. ; Gutierrez del Olmo, M. ; Sánchez Santolino, G. ; Nemes, N.M. ; Gárcia Hernández, M. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Antorrena, G. ; Morellon, L. ; De Teresa, J. M. ; Clement, M. ; Iborra, E. ; León, C. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2011-06-23Metallic surface layers are fabricated by doping (100) SrTiO_3 (STO) single crystals with oxygen vacancies generated by bombardment with Ar ions from an rf plasma source. The presence of oxygen vacancies is confirmed by cathodoluminescence and x[...]![]()
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Garcia, J. A. ; Remon, A. ; Urchulutegui, M. ; Piqueras de Noriega, Javier ; Jiménez, J. ; Torres, A. | Wiley-V C H Verlag Gmbh | 1997-02-16Infrared luminescence of Bi2Sr2CaCu2Ox ceramics, in the range 800 to 1800 nm (0.7 to 1.5 eV) has been investigated by photoluminescence and cathodoluminescence in the scanning electron microscope (SEM). Untreated samples do not show infrared lum[...]![]()
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Cathodoluminescence (CL) of the antiferromagnetic oxides NiO and CoO has been investigated. Both compounds show luminescence bands in the visible and near infrared spectral ranges, tentatively attributed to intra-ionic transitions. Dependence of[...]![]()
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Application of cathodoluminescence microscopy to the study of native acceptors in gallium antimonide
Piqueras de Noriega, Javier ; Méndez Martín, Bianchi ; Panin, G. N. ; Dutta, P. S. ; Dieguez, E. | I E E E | 1996Cathodoluminescence in the scanning electron microscope is used to ivestigate growth and prosess induced defects in GaSb crystals. In particular, luminescence emission has been used to study the nature of acceptor defects present after different[...]![]()
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A series of GaAs wafers with different doping levels and electrical resistivity has been used to investigate the scanning electron acoustic microscopy (SEAM) application to the characterization of this material. It has been found that SEAM is pa[...]![]()
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Chioncel, M. F. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Duhanian, N. ; Duffar, T. | natl Inst Optoelectronics | 2004-03Low band-gap InGaSb crystals are of interest for the development of thermo-photo-voltaic (TPV) cells and other devices operating in the infrared spectral range. In this work, cathodoluminescence (CL) in the scanning electron microscope (SEM) has[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Elsevier Science BV | 2011-07Cathodoluminescence (CL) of Ga2O3 nanowires and planar microstructures has been studied in a scanning electron microscope, as a function of the orientation angle of the structures relative to the position of the light detection system in the mic[...]![]()
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Piqueras de Noriega, Javier ; Díaz-Guerra Viejo, Carlos ; Vila Santos, María | Elsevier Science | 2013-01-25?-Bi_2O-3 microcrystals and microrods with pyramidal tips have been grown by a vapour–solid method using pure Bi as starting material. The morphology of the obtained microstructures depends on the annealing temperature and time. At 650 °C and fo[...]![]()
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Monteiro, T. ; Pereira, E. ; Correia, M. R. ; Xavier, C. ; Hofmann, D. M. ; Meyer, B. K. ; Fischer, S. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science BV | 1997-06Mid-band-gap emissions in GaN epilayers grown on 6H-SiC and sapphire are studied by time-resolved spectroscopy (TRS). The yellow luminescence peaking at ca. 1.2 eV at low-temperature shifts to higher energies with increasing temperature. The pre[...]![]()
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Albrecht, M. ; Cremades Rodríguez, Ana Isabel ; Krinke, J. ; Christiansen, S. ; Ambacher, O. ; Piqueras de Noriega, Javier ; Strunk, H. P. ; Stutzmann, M. | Wiley-V C H Verlag Gmbh | 1999-11We analyse the recombination and scattering at dislocations in Si doped AlGaN layers by transmission electron microscopy (TEM), electron beam induced current (EBIC) and cathodoluminescence. We show that c-type screw dislocations are nonradiative[...]![]()
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Nogales Díaz, Emilio ; Montone, A. ; Cardellini, F. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | natl Inst Optoelectronics | 2002-12The processes of the characteristic radiative transition of Er3+ ions involved in optically active centers in nano-crystalline silicon have been studied by photo-luminescence (PL) and cathodo-luminescence (CL). Infrared emission is observed in c[...]![]()
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Gómez, P. ; Jiménez, J. ; Martín, P. ; Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco | American Institute of Physics | 1993-11-15The effect of oxygen loss on the luminescence of YBa_2Cu_3O_(7-x) has been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM) and by Raman microprobe measurements. The results herein indicate that a CL band at 530[...]![]()
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Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Polenta, L. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Physical Society | 1996-09-15Deep levels in Cd_(1-x)Zn_xTe have not yet been fully characterized and understood, even though this material is very promising for medical and optoelectronic applications. We have investigated p-type semi-insulating Cd_(0.8)Zn_(0.2)Te with cath[...]![]()
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Cremades Rodríguez, Ana Isabel ; Santos, M. T. ; Remon, A. ; Garcia, J. A. ; Dieguez, E. ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-05-01Cathodoluminescence and photoluminescence of Bi_(12)Si_(O)20 and Bi_(12)GeO_(20) samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm [...]![]()
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Cathodoluminescence and photoluminescence in the core region of Bi_12GeO_20 and Bi_12SiO_20 crystals
Cremades Rodríguez, Ana Isabel ; Santos, M. T. ; Remon, A. ; Garcia, J. A. ; Dieguez, E. ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-05-01Cathodoluminescence and photoluminescence of Bi_12SiO_20 and Bi_12GeO_20 samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm band is [...]![]()
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Díaz-Guerra Viejo, Carlos ; Remon, A. ; Garcia, J. A. ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 1997-10Cathodoluminescence (CL) and photoluminescence (PL) of nickel oxide (NiO) have been investigated. The observed emission bands in the visible and near infrared spectral ranges are attributed to Ni^(2+) intraionic transitions. Some of the features[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Garcia, J. A. ; Remon, A. ; Opagiste, C. | Elsevier Science BV | 1997-05The capability of luminescence techniques to characterize BaCuO_2 and in particular to detect the presence of this compound as impurity phase in high-T-c superconductors (HTSC) has been investigated. Cathodoluminescence (CL) in the scanning elec[...]![]()
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Garcia, J. A. ; Fernández Sánchez, Paloma ; Remon, A. ; Piqueras de Noriega, Javier ; Muñoz, V. ; Triboulet, R. | IOP publishing ltd | 2001-05Samples of zinc telluride bulk single crystals, which were deformed in uniaxial compression, have been studied by photoluminescence (PL) and cathodoluminescence (CL). As a particular feature the deformed samples present a PL emission band peaked[...]![]()
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Domínguez-Adame Acosta, Francisco ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; De Diego, N. ; LLopis, J. ; Moser, P. | Editions Physique | 1989-06Positron annihilation (PA) is a sensitive technique for detection of vacancy-type defects in crystals, that has been widely used in recent years to study defects in semiconductors (1). On the other side, CL and other luminescence techniques have[...]![]()
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Cathodoluminescence (CL) and remote electron beam induced current (REBIC) in the scanning electron microscope (SEM) has been used to investigate the electron recombination mechanisms in tin oxide. Sintered material prepared from high purity powd[...]![]()
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Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Hardalo, C. ; Piqueras de Noriega, Javier ; Sekiguchi, T. | Elsevier Science SA | 2002-04-30Bulk ZnO single crystals grown by the hydrothermal (HTT) and alkali flux methods have been investigated by means of scanning tunnelling spectroscopy (STS) and time resolved cathodoluminescence (CL). Measurements were performed in the different c[...]![]()
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Pal, U ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Dieguez, E. | Amer Inst Physics | 1995-08-01Cathodoluminescence (CL) microscopic techniques have been used to study the spatial distribution of structural defects and the deep levels in CdTe:Ge bulk crystals. The effect of Ge doping with concentrations of 10(17) and 10(19) cm(-3) on the c[...]