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Investigation of TiO2 thin films as a cathodic material for electrochromic display devices

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Abstract

Titanium dioxide is a preferred material in many fields of applications and is also used as one of best electrochromic display (ECD) candidates due to its chemical stability. Electrochromic devices are innovative, low-cost and low energy consumption for using as displays. In this work, electrochromic, morphological, structural, and some optical properties of tandem structures were comprehensively investigated. The mean thicknesses of the samples were measured as 86 and 120 nm on ITO- and FTO-coated glass substrates, respectively. The chronoamperometry test was performed to determine some electrochromic properties of the ECD. It was observed that the amounts of ions intercalated/de-intercalated from the coated TiO2 layer were almost equal to each other. According to the chronocoulometric analysis, the superior reversibility and coloration efficiency of the assembled ECD were found to be 83% and 26 cm2/C, respectively, onto ITO substrates. Higher reversibility is revealed in thinner films, which is consistent with the obtained thickness results. In a similar manner, highest coloration efficiency obtained for our ECD has demonstrated good contact between the TiO2-deposited layer and the ITO-coated glass substrate. Also, the highest porosity was reached by taking the highest coloration efficiency value into account. Moreover, coloration efficiencies and ΔT ratios are changed due to the interlayer transparent conductive oxide layers. Raman spectroscopy measurement reveals the anatase phase of TiO2 films on both substrates. Another important finding is related to the defect structures of the TiO2 phase. TiO2, TiO3 and TiO4 mixed phases show the lower coloration efficiency according to the TiO2 phase, for the first time. TiO3 and TiO4 phases were grown by using the FTO-coated glass substrate. Comparing results with reports has shown that our investigated design and technology for ECD applications are good candidates for such applications.

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Acknowledgement

This research study was supported by Eskişehir Osmangazi University, Scientific Research Council Granted by 201719041.

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Authors and Affiliations

  1. Faculty of Science and Letters, Department of Physics, Eskisehir Osmangazi University, TR-26040, Eskisehir, Turkey

    Nihan Akkurt, Suat Pat, Reza Mohammadigharehbagh, Mustafa Özgür, Uğur Demirkol & Şadan Korkmaz

  2. Department of Physics, Uludağ University, Bursa, Turkey

    Ali Olkun

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  1. Nihan Akkurt
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Akkurt, N., Pat, S., Mohammadigharehbagh, R. et al. Investigation of TiO2 thin films as a cathodic material for electrochromic display devices. J Mater Sci: Mater Electron 31, 9568–9578 (2020). https://doi.org/10.1007/s10854-020-03499-0

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