A Mechanism of Porous-Silicon Luminescence
Loading...
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
We discuss the discrete spectrum induced by bulges on threadlike mesoscopic objects, using two models, a continuous hard-wall waveguide and a discrete tight-binding model with two sorts of atomic orbitals. We show that elongated bulges induce numerous quasibound states. In the discrete model we also evaluate the probability of transition between the localized states and extended ones of the "valence" band. We suggest this as a mechanism governing the porous-silicon luminescence. In addition, the model reproduces the dominance of nonradiative transitions, blue shift for finer textures and luminescence suppression at low temperatures.
A LaTeX source file together with two ps figures. The paper is due to appear in Phys. Rev. B
A LaTeX source file together with two ps figures. The paper is due to appear in Phys. Rev. B