Descripción
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ZnO nanofibre networks (NFNs) were grown by vapour transport method on Si-based substrates. One type of substrate was SiO2 thermally grown on Si and another consisted of a Si wafer onto which Si nanowires (NWs) had been grown having Au nanoparticles catalysts. The ZnO-NFN morphology was observed by scanning electron microscopy on samples grown at 600 °C and 720 °C substrate temperature, while an focused ion beam was used to study the ZnO NFN/Si NWs/Si and ZnO NFN/SiO2 interfaces. Photoluminescence, electrical conductance and photoconductance of ZnO-NFN was studied for the sample grown on SiO2. The photoluminescence spectra show strong peaks due to exciton recombination and lattice defects. The ZnO-NFN presents quasi-persistent photoconductivity effects and ohmic I-V characteristics which become nonlinear and hysteretic as the applied voltage is increased. The electrical conductance as a function of temperature can be described by a modified three dimensional variable hopping model with nanometer-ranged typical hopping distances | |
Internacional
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Si |
Nombre congreso
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The 5th Latin American Conference on Metastable and Nanostructured Materials |
Tipo de participación
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960 |
Lugar del congreso
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Sao Paulo, Brasil |
Revisores
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Si |
ISBN o ISSN
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1516-1439 |
DOI
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Fecha inicio congreso
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30/09/2011 |
Fecha fin congreso
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02/10/2011 |
Desde la página
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1 |
Hasta la página
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6 |
Título de las actas
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Materials Research (onliine) http://www.scielo.br/scielo.php?pid=S1516-14392013005000030&script=sci_arttext |