Transition from anomalous kinetics towards Fickian diffusion for Si dissolution into amorphous Ge

Details Transition from anomalous kinetics towards Fickian diffusion for Si dissolution into amorphous Ge Transition from anomalous kinetics towards Fickian diffusion for Si dissolution into amorphous Ge

2009-02-12

arxiv.org/abs/0902.2046v1

Applied Physics Letters 92 (2008) 143104

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.2908220

Over the last years several experimental and theoretical studies of diffusion kinetics on the nanoscale have shown that the time evolution differs from the classical Fickian law (kc=0.5). However, all work was based on crystalline samples or models, so far. In this letter, we report on the diffusion kinetics of a thin amorphous-Si layer into amorphous-Ge to account for the rising importance of amorphous materials in nanodevices. Employing surface sensitive technics, the initial kc was found at 0.7+-0.1. Moreover, after some monolayers of Si dissolved into the Ge, kc changes to the generally expected classical Fickian law with kc=0.5.

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