| Autor: |
Nadia Celeste Vega, Monica Tirado, David Comedi, Andres Rodriguez, Tomas Rodriguez, Gareth M. Hughes, Chris R. M. Grovenor, Fernando Audebert |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Materials Research, Vol 16, Iss 3, Pp 597-602 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
1516-1439 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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