Abstract
Some results of studying the unoccupied electron states and the formation of a boundary potential barrier during the thermal vacuum deposition of ultrathin 4-quaterphenyl oligophenyl films onto the surfaces of CdS and oxidized silicon were presented. Using X-ray photoelectron spectroscopy (XPS), the atomic Cd and S concentrations were established to be the same on the surface of a 75-nm CdS layer formed by atomic layer deposition (ALD). The electron characteristics of 4-quaterpheyn films with a thickness of up to 8 nm were studied in the process of their deposition onto the surface of a formed CdS layer and the surface of oxidized silicon by total current spectroscopy (TCS) within an energy range from 5 to 20 eV above EF. The energy positions of major maxima in the fine structure of the total current spectra (FSTCS) of 4-quaterphenyl films were established. The positions of maxima were reproducible, when the two selected materials of substrates were used. A slight decrease in the work function from 4.2 to 4.1 eV during the thermal deposition of 4-quaterpheynl onto the CdS surface was established. The work function was revealed to grow from 4.2 to 4.5 eV, when a 4-quaterphenyl film was deposited onto the surface of oxidized silicon. Some possible mechanisms of physicochemical interaction between the 4-quaterphenyl film and the surfaces of the studied substrates that lead to different work function values observed on these substrates were discussed.
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ACKNOWLEDGMENTS
This study was carried out on the equipment of the Research Park of Saint-Petersburg State University “Physical Methods of Surface Investigations” and “Innovative Technologies of Composite Nanomaterials.”
Funding
The TCS studies of 4-quaterphenyl films on silicon were supported by the Russian Science Foundation (grant no. 19-13-00021). The surface studies of formed CdS were sponsored by the Russian Foundation for Basic Research (grant no. 20-03-00026).
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Translated by G. Glushachenkova
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Komolov, A.S., Lazneva, E.F., Gerasimova, N.B. et al. Unoccupied Electron States of Ultrathin Quaterphenyl Films on the Surfaces of Layered CdS and Oxidized Silicon. Phys. Solid State 63, 1205–1210 (2021). https://doi.org/10.1134/S1063783421080138
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DOI: https://doi.org/10.1134/S1063783421080138