Spectral characteristics of visible light emission from porous Si: Quantum confinement or impurity effect?
- 1 March 1994
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 75 (5) , 2727-2729
- https://doi.org/10.1063/1.356207
Abstract
Emission and excitation spectra of visibly luminescing porous Si structures subjected to a long-term air impregnation are analyzed. A red shift of emission spectrum with increasing initial porosity is reported. A correlation of excitation spectra with the energy of Γ′25-Γ15 transition in Si monocrystal is found in the samples differing in the initial porosity. The results seem to be hard to explain in terms of the quantum-confinement models in their present state. An alternative model based on band-gap widening in heavily doped silicon structures is considered as well.This publication has 27 references indexed in Scilit:
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