Article

Journal of Chemical Sciences

, Volume 115, Issue 5, pp 401-410

Ultra thin films of nanocrystalline Ge studied by AFM and interference enhanced Raman scattering

  • S. BalajiAffiliated withDepartment of Instrumentation, Indian Institute of Science
  • , S. MohanAffiliated withDepartment of Instrumentation, Indian Institute of Science
  • , D. V. S. MuthuAffiliated withDepartment of Physics, Indian Institute of Science
  • , A. K. SoodAffiliated withDepartment of Physics, Indian Institute of Science Email author 

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Abstract

Initial growth stages of the ultra thin films of germanium (Ge) prepared by ion beam sputter deposition have been studied using atomic force microscope (AFM) and interference enhanced Raman scattering. The growth of the films follows Volmer-Weber growth mechanism. Analysis of the AFM images shows that Ostwald ripening of the grains occurs as the thickness of the film increases. Raman spectra of the Ge films reveal phonon confinement along the growth direction and show that the misfit strain is relieved for film thickness greater than 4 nm.

Keywords

Ion beam sputtering ultra thin Ge films interference enhanced Raman spectroscopy phonon confinement atomic force microscopy