Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7987941 | Solid State Communications | 2018 | 10 Pages |
Abstract
Electronic structure of the Cs/n-GaN nano-interface has been studied in situ via synchrotron-based photoelectron spectroscopy by excitation in the energy range of 70-400â¯eV. The GaN sample was grown by an original method of epitaxy of low-defect unstressed nanoscaled films on AlGaN/SiC/Si substrate. Changes in the surface state spectra and in the Ga 3d, Cs 4d, Cs 5p, N 1s core level spectra have been revealed under different cesium coverages. The intrinsic surface states for the clean GaN surface at binding energies of â¼5.0â¯eV and â¼7.0â¯eV are attenuated during Cs adsorption. Simultaneously three Cs induced surface states are found to arise. Drastic changes in the surface state spectrum were ascertained and shown to be originated from the local interacting Ga dangling bonds and adsorbed Cs atoms initiating the electron redistribution effect with formation of the semiconductor-like Cs/n-GaN interface.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
G.V. Benemanskaya, S.Ð. Kukushkin, P.A. Dementev, M.N. Lapushkin, S.N. Timoshnev, D.V. Smirnov,