User login

You are here

Dynamics of terraces on a silicon surface due to the combined action of strain and electric current

Wei Hong's picture

A (001) surface of silicon consists of terraces of two variants, which have an identical atomic structure, except for a 90° rotation. We formulate a model to evolve the terraces under the combined action of electric current and applied strain. The electric current motivates adatoms to diffuse by a wind force, while the applied strain motivates adatoms to diffuse by changing the concentration of adatoms in equilibrium with each step. To promote one variant of terraces over the other, the wind force acts on the anisotropy in diffusivity, and the applied strain acts on the anisotropy in surface stress. Our model reproduces experimental observations of stationary states, in which the relative width of the two variants becomes independent of time. Our model also predicts a new instability, in which a small change in experimental variables (e.g., the applied strain and the electric current) may cause a large change in the relative width of the two variants.

 

Preprint available online.

AttachmentSize
PDF icon Electromigration_Elastic 11 03 suo.pdf305.96 KB
Subscribe to Comments for "Dynamics of terraces on a silicon surface due to the combined action of strain and electric current"

Recent comments

More comments

Syndicate

Subscribe to Syndicate