A Mechanism of Porous-Silicon Luminescence

Details A Mechanism of Porous-Silicon Luminescence A Mechanism of Porous-Silicon Luminescence

1997-09-25

arxiv.org/abs/cond-mat/9709281v1

Phys. Rev. B57 (1998), 1382-1385

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

A LaTeX source file together with two ps figures. The paper is due to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.57.1382

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.

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