Functional properties of silicon nanocrystals in oxigen-rich amorphous matrices formed by laser irradiation of substoichiometric silicon oxides
| Autor: | Alfredo Rubino, G. Fameli, Fulvia Villani, Stefano Salvatori, M. Burchielli, Maria Cristina Rossi, C. Felici, Gennaro Conte |
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| Přispěvatelé: | M., Burchielli, Conte, Gennaro, G., Fameli, C., Felici, Rossi, Maria Cristina, A., Rubino, S., Salvatori, F., Villani |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Amorphous silicon
Quenching Photoluminescence Materials science Silicon business.industry Band gap Nanocrystalline silicon Analytical chemistry chemistry.chemical_element Bioengineering Conductivity Amorphous solid Biomaterials chemistry.chemical_compound Optics chemistry Mechanics of Materials business |
| Popis: | Silicon-based nanostructured thin films have been obtained through laser irradiation of amorphous silicon oxides. The optoelectronic properties of nanostructured films largely differ from their amorphous counterpart, exhibiting optical gap narrowing, wavelength-dependent spectral modification of the photoluminescence (PL) and conduction mechanism variations. In particular, following the hydrogen effusion and related defect density increase, a spectral red shift and PL intensity quenching is detected for λ exc =514.5 nm, whereas PL enhancement and spectral blue shift is observed at λ exc =632.8 nm. Different thermal activation regimes of conductivity are also detected by conductivity measurements. Such results are discussed in terms of microstructural changes from an hydrogenated amorphous network to a nanostructured two-phase material where wavelength-selective excitation of radiative recombination channels and temperature-dependent conductivity paths occurs. |
| Databáze: | OpenAIRE |
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