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Models and Mechanisms for the Luminescence of Porous Si

Published online by Cambridge University Press:  25 February 2011

F. Koch
F. Koch*
Affiliation:
Tech. Univ. Munich, Physik-Department E16, D-8046 Garching, Germany
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Abstract

Explanations for the efficient, visible luminescence of porous Si fall broadly into three categories. At the extremes are the pure quantum-well point of view and the molecular agents hypothesis. We make here the case for a model in which the dominant absorption characteristics are those of a quantum well, but luminescence occurs via boundary states on the nanocrystalline particles. This so-called “smart quantum-well” mechanism accounts for the multiple emission bands of porous Si in a natural way. In particular, the infrared band is assigned as an electronic transition to a deep level. From this we determine the conduction band shift with particle size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 298: Symposium B – Silicon-Based Optoelectronic Materials , 1993 , 319
Copyright
Copyright © Materials Research Society 1993

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