Timoshnev, S. N.; Benemanskaya, G. V.; Mizerov, A. M.; Sobolev, M. S.; Enns, Ya. B.: Changes in the Electronic Properties of the GaN/Si(111) Surface under Li Adsorption. Semiconductors 57 (2023), p. 508-512
10.1134/s106378262308016x
Open Access Version
Abstract:
The electronic structure of the epitaxial GaN/Si(111) layers and the Li/GaN/Si(111) interface with a monolayer Li coverage has been studied in situ under ultrahigh vacuum conditions. The experiments were carried out using photo electron spectroscopy with synchrotron radiation in the photon energy range 75–850 eV. The photoemission spectra in the valence band and the core levels of Ga 3d, N 1s, and Li 1s are studied for the monolayer Li coating. It is found that Li adsorption causes a significant decrease in the intensity of the photoemission line of the intrinsic surface state and the appearance of an induced surface state due to charge transfer between the adsorbed Li layer and surface Ga atoms. It has been found that the GaN/Si(111) surface has predominantly Ga polarity. The Li/GaN/Si(111) interface has a semiconductor character.