Strain-driven composition gradients in nanocrystalline SiGe

Tzoumanekas, C.; Kelires, P. C.
June 2003
Applied Physics Letters;6/30/2003, Vol. 82 Issue 26, p4681
Academic Journal
Monte Carlo simulations shed light onto the structure and composition of nanocrystalline SiGe. A strong enhancement of Ge content in nanocrystals is found, driven by the stress gradient between the crystalline and amorphous components of the network. For a stoichiometric amorphous matrix and for small nanocrystals, typically 4 nm in diameter, the Ge content in the nanocrystals reaches ;80%. The composition gradient declines with increasing size. The nanocrystals consist of a large ordered Ge-rich core and an outer less-ordered region where alloying is enhanced.


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