Article

Article title THE PHASE FORMATION IN THE Ga-As-O SYSTEM UNDER CONDITIONS OF MOLECULAR BEAM EPITAXY
Authors M.S. Solodovnik
Section SECTION III. NANOTECHNOLOGY
Month, Year 04, 2017 @en
Index UDC 621.38-022.532
DOI
Abstract The paper presents the results of theoretical studies of the thermodynamics of phase for-mation processes in the Ga-As-O system, taking into account the specific conditions observed in molecular beam epitaxy of group III arsenides. The results of calculations of the double and triple phase diagrams which are possible in the system under conditions at given temperature and pres-sure ranges characteristic for the observed experimentally processes in the molecular beam epitaxy technology are presented. The analysis of all possible intermediate and final reaction products of the interaction between the components and their forms in the Ga-As-O system is carried out. Based on the analysis of phase diagrams and probable reaction products, the equations of basic and intermediate chemical reactions occurring in the system are determined and compiled. The temperature dependences of the changes in the free Gibbs energy ΔG(T) for all the main and intermediate reactions between the main components of the system – crystal GaAs (substrate), atomic Ga and molecular As4 from the vapor phase (fluxes of growth components) and GaAs native oxide components – are calculated. Based on the analysis of Gibbs energy changes for the obtained equations, we showed that the components of GaAs native oxide enter into chemical reactions not only with crystalline GaAs and Ga from the vapor phase, but also with the molecular As flux, and also participate in solid-phase reactions between themselves. It is established that in the processes of interaction of GaAs native oxide with growth components and bulk material, not only volatile monoxide Ga2O and molecular As2 (As4) are formed as reaction products, but also monoxide AsO that occurs both during direct decomposition of As-containing oxide film components, and in the processes of their interaction with molecular fluxes. It has also been found that reactions with direct formation predominantly volatile compounds begin to dominate at substrate temperatures above 550°C. This makes it possible to optimize the process of thermal desorption of GaAs oxides in the technology of molecular beam epitaxy of GaAs by suppressing the reactions with the formation of Ga2O3, which negatively affects the morphology of the substrate by direct interaction with it.

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Keywords Molecular-beam epitaxy; gallium arsenide; intrinsic oxide; phase formation; thermodynam-ics; gallium oxide; arsenic oxide.
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