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Title: | Photoluminiscence in silicon powder grown by plasma-enhanced chemical-vapour deposition: Evidence of a multistep-multiphoton excitation process |
Author: | Roura Grabulosa, Pere Costa i Balanzat, Josep Sardin, Georges Morante i Lleonart, Joan Ramon Bertrán Serra, Enric |
Keywords: | Matèria condensada Propietats òptiques Ciència dels materials Optical properties Materials science Condensed matter |
Issue Date: | 1994 |
Publisher: | The American Physical Society |
Abstract: | The dynamics of the infrared photoluminescence (PL) in silicon powder grown by plasma-enhanced chemical-vapor deposition (PECVD) of silane is reported. A nonlinear dependence of PL intensity on laser power of the form I a: P" with n as high as 7 has been found, indicating a multistep-multiphoton excitation process. To confi.rm this hypothesis a very detailed theoretical and experimental analysis has been performed. As a result, the lifetimes of several levels in the excitation chain have been determined, as well as the optical cross section (u). For the slowest level u= 3 X 10- 18 cm2 and the lifetime is as long as 400 ms. As the energy of the emitted photon is smaller than that of the excitation photon, a model involving a considerable nonradiative energy relaxation, together with a tunnel effect is proposed. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.50.18124 |
It is part of: | Physical Review B, 1994, vol. 50, núm. 24, p. 124-133 |
URI: | http://hdl.handle.net/2445/10651 |
Related resource: | http://dx.doi.org/10.1103/PhysRevB.50.18124 |
ISSN: | 0163-1829 |
Appears in Collections: | Articles publicats en revistes (Física Aplicada) |
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