Observation of Geometry-Limited Mobility in Porous Silicon

Details Observation of Geometry-Limited Mobility in Porous Silicon Observation of Geometry-Limited Mobility in Porous Silicon

1998-11-14

arxiv.org/abs/cond-mat/9811205v1

Physics

Condensed Matter

Materials Science

5 pages of text, references, captions and 2 pages for figures

Scientific paper

We report photocarrier time-of-flight measurements in diode structures made of highly porous crystalline silicon. The corresponding electron and hole drift mobilities are very small compared to homogeneous crystalline silicon. They show two additional signatures of semiclassical transport that are directly limited by a porous geometry: the mobilities are dispersive (i.e. dependent on time), and have very little temperature-dependence. A pure, geometry-limited transport is surprising in the context of nanometer-scale models for electronic states such as quantum percolation or nanocrystal aggregation. In such models, confinement-induced energy shifts and localization are the dominant effects.

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