TY - JOUR

T1 - Kinetic study of GeOx amorphous film disproportionation into a-Ge nanoclusters / GeO2 system using Raman and infrared spectroscopy

AU - 帆, 张

AU - Володин, Владимир Алексеевич

AU - Астанкова, Ксения Николаевна

AU - Shvets, P.V.

AU - Goikhman, A.Yu.

AU - Vergnat, M.

N1 - The measurements of Raman and FTIR spectra are done on the equipment of the Center of Collective Usage “VTAN” NSU. Sample characterization by RBS has been done in the REC “Functional Nanomaterials”, Immanuel Kant Baltic Federal University, with the financial support from the Ministry of Science and Higher Education of the Russian Federation (project FZWM-2020-0008).

PY - 2024/5/1

Y1 - 2024/5/1

N2 - In this paper, based on the analysis of Raman spectroscopy data, the kinetics of the disproportionation reaction process (GeOx → (1−x/2)Ge + (x/2)GeO2) of an amorphous GeOx film during furnace annealing were studied. An approximation of the experimental kinetics of the disproportionation reaction to the theoretical Kolmogorov–Johnson–Mel–Avrami dependence has been carried out. By analyzing the temperature dependence of the formation time of amorphous germanium clusters, the activation energy of the formation process was obtained, which amounted to 0.9 ± 0.1 eV. In addition, it was found that the position of the Raman peak from amorphous germanium nanoclusters depends on their size. Thus, the phonon localization model can be applied not only to germanium nanocrystals but also to amorphous germanium clusters in the case of their ultra-small sizes (less than 1.5 nm), which is less than the phonon correlation length in amorphous germanium.

AB - In this paper, based on the analysis of Raman spectroscopy data, the kinetics of the disproportionation reaction process (GeOx → (1−x/2)Ge + (x/2)GeO2) of an amorphous GeOx film during furnace annealing were studied. An approximation of the experimental kinetics of the disproportionation reaction to the theoretical Kolmogorov–Johnson–Mel–Avrami dependence has been carried out. By analyzing the temperature dependence of the formation time of amorphous germanium clusters, the activation energy of the formation process was obtained, which amounted to 0.9 ± 0.1 eV. In addition, it was found that the position of the Raman peak from amorphous germanium nanoclusters depends on their size. Thus, the phonon localization model can be applied not only to germanium nanocrystals but also to amorphous germanium clusters in the case of their ultra-small sizes (less than 1.5 nm), which is less than the phonon correlation length in amorphous germanium.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85187955530&origin=inward

U2 - 10.1016/j.jnoncrysol.2024.122929

DO - 10.1016/j.jnoncrysol.2024.122929

M3 - Article

VL - 631

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

M1 - 122929

ER -