Abstract
Bi2Se3 thin films are widely studied as topological insulators and as prospective materials for thermoelectric and sensor applications. Storage of films under ambient conditions, especially at different humidities, may influence the physical properties of thin films.In the present work, electrochemical impedance spectroscopy is used to investigate the dependence of properties of continuous planar and partly disordered Bi2Se3 thin films, as well as nanoplate networks, deposited on mica, quartz and glass substrates by physical vapor deposition on the humidity in oxygen and nitrogen atmospheres. It has been shown that electrochemical impedance spectroscopy (EIS) can be used as an effective tool for the determination of the oxidation level of Bi2Se3 surfaces, the quality of the surface covering and for characterization of the type and parameters of the nanopores in Bi2Se3 thin films. Equivalent circuit models developed in this work characterize the interaction of gaseous water with non-oxidized and oxidized surfaces of Bi2Se3 nanostructures, as well as and with the substrate areas located between the Bi2Se3 nanoplates in the Bi2Se3 networks and open to the surrounding environment, in oxygen and nitrogen atmospheres.
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