Copper-Enriched Nanostructured Conductive Thermoelectric Copper(I) Iodide Films Obtained by Chemical Solution Deposition on Flexible Substrates


  • N.P. Klochko National Technical University “Kharkiv Polytechnic Institute”
  • V.R. Kopach National Technical University “Kharkiv Polytechnic Institute”
  • S.I. Petrushenko V.N. Karazin Kharkiv National University, Technical University of Liberec, Institute for Nanomaterials, Advanced Technologies and Innovation, Department of Advanced Materials
  • E.M. Shepotko National Technical University “Kharkiv Polytechnic Institute”
  • S.V. Dukarov V.N. Karazin Kharkiv National University
  • V.M. Sukhov V.N. Karazin Kharkiv National University
  • A.L. Khrypunova National Technical University “Kharkiv Polytechnic Institute”



copper(I) iodide, thermoelectricity, carrier transport, nanostructure, thin film, chemical solution process


The objects of our research are flexible thin-film thermoelectric materials with nanostructured CuI layers 0.5–1.0 μm thick, fabricated by the chemical solution method Successive Ionic Layer Adsorption and Reaction (SILAR) on flexible polyethylene terephthalate and polyimide substrates. These cubic γ-CuI films differ from films obtained by other chemical solution methods, such as spin-coating, sputtering, and inject printing, in their low resistivity due to acceptor impurities of sulfur and oxygen introduced into CuI from aqueous precursor solutions during SILAR deposition. Energy barriers at the boundaries of 18–22 nm CuI nanograins and a large number of charge carriers inside the nanograins determine the transport properties in the temperature interval 295–340 K characterized by transitions from semiconductor to metallic behavior with increasing temperature, which are typical of nanostructured degenerate semiconductors. Due to the resistivity of about 0.8 mΩ· m at 310 K and the Seebeck coefficient 101 μV/K, the thermoelectric power factor of the CuI film 1.0 μm thick on the polyimide substrate is 12.3 μW/(m · K2), which corresponds to modern thin-film p-type thermoelectric materials. It confirms the suitability of CuI films obtained by the SILAR method for the fabrication of promising inexpensive non-toxic flexible thermoelectric materials.


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How to Cite

Klochko, N., Kopach, V., Petrushenko, S., Shepotko, E., Dukarov, S., Sukhov, V., & Khrypunova, A. (2024). Copper-Enriched Nanostructured Conductive Thermoelectric Copper(I) Iodide Films Obtained by Chemical Solution Deposition on Flexible Substrates. Ukrainian Journal of Physics, 69(2), 115.



Surface physics