Medium range order in amorphous thin films of Ge2 Se 3, a phase change memory material, was examined using electron nanodiffraction fluctuation electron microscopy. Variance measurements showed that medium range order existed at 0.36 and 0.58 Å-1L. The film was not at equilibrium and contained a few monoclinic nanocrystals with weak Bragg maxima at 0.33, 0.54, and 0.63 Å-1, which are related to the GeSe2 equilibrium phase at this composition. We also determined the variance for amorphous silicon (a-Si) and amorphous silica (a ?SiO2) and those results agree with others in the literature. It is expected that the medium range order is related to nucleation of the crystallization reaction in Ge2 Se3.
ASJC Scopus subject areas
- Physics and Astronomy(all)