Influence of light intensity on the photoluminescence of silicon nanostructures
| Autor: | Gilles Ledoux, Dominique Porterat, Cécile Reynaud, David Amans, O. Guillois |
|---|---|
| Přispěvatelé: | Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), DRT/LITEN/DSEN/GENEC/Laboratoire Cellules et Composants (LABORATOIRE CELLULES ET COMPOSANTS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Rok vydání: | 2002 |
| Předmět: |
Photoluminescence
Materials science Silicon General Physics and Astronomy chemistry.chemical_element Auger effect PACS : 78.67.Bf 78.55.Ap 78.66.Db 78.55.Mb semimetallic thin films 02 engineering and technology Porous silicon 01 natural sciences Molecular physics Fluence symbols.namesake 0103 physical sciences nanostructured materials red shift 010306 general physics business.industry spectral line shift silicon 021001 nanoscience & nanotechnology [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Wavelength Light intensity chemistry symbols Optoelectronics photoluminescence elemental semiconductors porous semiconductors 0210 nano-technology business Excitation |
| Zdroj: | Journal of Applied Physics Journal of Applied Physics, American Institute of Physics, 2002, 91 (8), pp.5334-5340. ⟨10.1063/1.1461064⟩ Journal of Applied Physics, 2002, 91 (8), pp.5334-5340. ⟨10.1063/1.1461064⟩ |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | International audience; The strong visible photoluminescence (PL) of nanostructured silicon, such as porous Silicon and silicon nanocrystals, is studied as a function of the power and the wavelength of the excitation laser source. The position of the PL peak is a function of the fluence: when the incident fluence is increased, the PL peak is blueshifted, and it is redshifted to its initial position when the fluence is decreased back. The PL yield is strongly attenuated with the increasing fluence and this decrease is partially irreversible. The behavior is also found to be a function of the wavelength of excitation: the shorter the excitation wavelength, the stronger the fluence effect. The PL temporal behavior has also been studied and appears to be weakly sensitive to the fluence. Fluence effects are compared to temperature effects and both are noticeably different, proving the absence of heating effects in our experiment for a wide range of incident power. Auger effect and state filling are discussed in order to understand the experimental results in the framework of the quantum confinement process. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|