Abstract

Electrochromic performance of WO_xC_y films deposited onto 60 Ω/□ flexible PET (polyethylene terephthalate)/ITO (indium tin oxide) substrates by low temperature plasma-enhanced chemical vapor deposition (PECVD) was investigated. It was proven that extraordinary electrochromic performance was provided when the precursor [tungsten carbonyl, W(CO)₆; TC] vapor, carried by argon gas, was mixed with air gas and synthesized by radio frequency (r.f.) power at room temperature (23 °C). Cyclic voltammetry switching measurements found that only low driving voltages from − 1 V to 1 V were needed to provide reversible Li⁺ ion intercalation and de-intercalation. The light modulation with up to 63.6% of transmittance variation at a wavelength of 650 nm was obtained for 150 cycles of Li⁺ intercalation and de-intercalation in a 0.1 M LiClO₄-PC (propylene carbonate) electrolyte.

Keywords: PECVD; Flexible substrate; Electrochromism; Tungsten oxide; Cyclic voltammetry

Article Outline

1. Introduction

2. Experimental details

3. Results and discussion

3.1. Surface morphology and electrochromic performance

3.2. Intercalation/de-intercalation coefficients of Li⁺ ions and surface compositions

4. Conclusion

Acknowledgements

References