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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[...]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
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
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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
Pereira, L. ; Pereira, E. ; Gomes, H. ; Rodrigues, A. ; Rees, A. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science SA | 2000-04The properties of microelectrical conduction in microwave plasma assisted chemical vapour deposition (MPCVD) diamond films were investigated using an atomic force microscopy probe, giving a morphological map of the electrical conduction with a s[...]texto impreso
Monteiro, T. ; Pereira, E. ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | Electrochemical Soc Inc | 1993-12Time resolved photoluminescence (TRPL) of untreated and heat-treated n-type GaP:S samples has been investigated and compared with data from cathodoluminescence in a scanning electron microscope (CL-SEM). Special attention is given to broad emiss[...]texto impreso
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[...]
