Details

Autor(en) / Beteiligte

• Faceira, Brandon
• Teulé‐Gay, Lionel
• Le Hébel, Jade
• Labrugère‐Sarroste, Christine
• Ibalot, Fabienne
• Huang, Hou‐Yi
• Huang, Yu‐Cheng
• Dong, Chung‐Li
• Salvetat, Jean‐Paul
• Maglione, Mario
• Rougier, Aline

Titel

Origin of the Memory Effect in Electrochromic Sputtered WO3 Films: Composition, Structure, or Morphology?

Ist Teil von

• Advanced materials interfaces, 2023-11, Vol.10 (33), p.n/a

Ort / Verlag

Weinheim: John Wiley & Sons, Inc

Erscheinungsjahr

2023

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• The memory effect property, described as a reversible color persistence while the potential is withdrawn, is of particular importance to reaching zero‐energy consumption electrochromic devices. Nevertheless, often observed in organic materials, it is poorly studied in oxides. In this study, electrochromic tungsten oxide thin films are elaborated at different working pressures by radiofrequency magnetron sputtering. The influence of the deposition pressure on the electrochemical properties of WO3 films as well as on their memory effect is investigated. Three kinds of WO3 films can be distinguished: with irreversible blue coloration, with reversible coloration presenting a high memory effect, and with reversible coloration with a low memory effect. The origin of these discrepancies is studied through the composition, the local atomic environment, and the morphology of the WO3 thin films. An increase of transmittance at 550 nm as low as 15.8% in 48 h in air and 5.2% in 24 h in the electrolyte is recorded. This study highlights a better understanding of the memory effect property of electrochromic oxides for low‐consumption energy electrochromic devices, pointing out morphology as a key parameter. The influence of the working pressure during sputtering of electrochromic WO3 thin films on their self‐bleaching is investigated. The results show an increase of self‐bleaching leading the color to go back from blue to colorless. At too low working pressure, the corresponding lithium inserted LixWO3 films present an irreversible blue coloration.