Features of water vapor adsorption and desorption on the surface of non-stoichiometric tin dioxide films
https://doi.org/10.29235/1561-2430-2020-56-1-102-113
Abstract
Herein, the influence of water vapor adsorption and desorption processes on the surface of SnO2−δ nanocrystalline films with different concentrations of oxygen vacancies on their electrical conductivity at room temperature was studied. SnO2−δ films were synthesized by means of reactive magnetron sputtering of tin in an argon-oxygen plasma followed by 2-stage oxidative annealing. The concentration of oxygen vacancies in the films was varied by changing the 2nd stage annealing temperature within the range 350–400 °C. It was found that in the films with the highest concentration of oxygen vacancies (~1020 cm−3) in the region of low relative humidity (less than ~30 %), an increase in electrical conductivity was observed due to the dissociative adsorption of water molecules with the formation of hydroxyl groups. The adsorption of water vapor on the surface of SnO2−δ films at room temperature at relative humidity values higher than ~30 % was found to induce a decrease in the electrical conductivity of the samples. The generation of positive and negative EMF pulses between the open surface of SnO2−δ nanocrystalline films and the one covered by waterproof materials under the adsorption and desorption of water vapor, respectively, was detected. The change of resistance and the generated EMF value under the adsorption-desorption processes was found to increase with the concentration of free charge carriers in the films.
Supporting agencies: This work was supported by the Belarusian National Research Programme “Convergence- 2020” (subprogram “Integration”, task No. 3.3.1), the State Committee on Science and Technology of the Republic of Belarus (grant No. Ф19ЛИТГ-001), the Research Council of Lithuania (grant No. S-LB-19-5), and by the EU Programme H2020-MSCA-RISE-2015 (grants No. 691010 HUNTER and No. 871284 SSHARE).
About the Authors
D. V. Adamchuck
Belarusian State University
Belarus
Belarus
Dzmitry V. Adamchuk – Reseacher, Laboratory of Physics of Electronic Materials, Department of Semiconductor Physics and Nanoelectronics, Faculty of Physics
4, Nezavisimosty Ave., 220030, Minsk
V. K. Ksenevich
Belarusian State University
Belarus
Belarus
Vitaly K. Ksenevich – Ph. D. (Physics and Mathematics), Associate Professor, Head of the Laboratory of Physics of Electronic Materials, Department of Semiconductor Physics and Nanoelectronics, Faculty of Physics
4, Nezavisimosty Ave., 220030, Minsk
N. A. Poklonski
Belarusian State University
Belarus
Belarus
Nikolai A. Poklonski – Dr. Sc. (Physics and Mathematics), Professor, Professor of the Department of Semiconductor Physics and Nanoelectronics, Faculty of Physics
4, Nezavisimosty Ave., 220030, Minsk
A. I. Kavaleu
Belarusian State University
Belarus
Belarus
Aliaksandr I. Kavaleu – Ph. D. (Physics and Mathematics), Senior Lecturer of the Department of Semiconductor Physics and Nanoelectronics, Faculty of Physics
4, Nezavisimosty Ave., 220030, Minsk
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