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Thermodynamics of coherently-strained GexSi1-x nanocrystals on Si(001): Alloy composition and island formation

Medeiros-Ribeiro, Gilberto and Williams, R. Stanley (2007) Thermodynamics of coherently-strained GexSi1-x nanocrystals on Si(001): Alloy composition and island formation. NANO LETTERS, 7 (2). pp. 223-226.

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Official URL: http://pubs.acs.org/doi/full/10.1021/nl062677b

Abstract

We determined the enthalpic and entropic contributions to the thermodynamics of coherently strained nanocrystals grown via deposition of pure Ge on Si(001) surfaces at 600 and 700 degrees C by analyzing their composition profile and local strain. We found that the free energy associated with the entropy of mixing, which drives GexSi1-x alloy formation, was significantly larger than the relaxation enthalpy that produces the islands. Thus, entropy plays a significant role in the evolution of the size and shape of the islands during growth through the strong thermodynamic drive to form an alloy.

Item Type:Article
Uncontrolled Keywords:ELECTRICAL-PROPERTIES; DOPED CERIA; TOMOGRAPHY; TEMPERATURES; PARTICLES; OXIDATION
Subjects:Material Science > Functional and hybrid materials
ID Code:6188
Deposited By:IoN
Deposited On:10 Sep 2009 12:15
Last Modified:10 Sep 2009 12:15

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