Electrochromic Properties of Iron Oxide Thin Films Prepared by Chemical Vapor Deposition

Abstract

Iron oxide thin films were prepared by chemical vapor deposition. The source material was iron (III) acetylacetonate. The Fe2O3 films were produced at a substrate temperature above 200°C. The films deposited at a substrate temperature above 300°C were polycrystalline β‐Fe2O3 . Reduction and oxidation of the amorphous films in a 0.3 M LiClO4 propylene carbonate solution caused desirable changes in optical absorption. Coulometry indicated that the coloration efficiency was 6.0 to 6.5 cm2 C−1 .

Elucidation of the electrochromic mechanism of nanostructured iron oxides films

“…As a conclusion, it was reported that only the g-Fe 2 O 3 phase displays electrochromism, while the a-Fe 2 O 3 phase is chromogenically inert [12]. Furthermore, other works reported that iron oxide films immersed in organic solvents get dark at cathodic potentials with a little optical modulation when Li + ions are inserted [14]; also, higher optical modulation has been reported for amorphous and b-Fe 2 O 3 films [15,16]. Additionally, in iron oxide films prepared with sulfate residues, a double EC behavior was described later [17].…”

Optical Characterization of NiO Doped Fe₂O₃

“…Many researchers have worked on different techniques for fabricating Fe 2 O 3 such as; Spray pyrolytic method [9][10], Sol-gel [11][12], spin-coating deposition [13], chemical vapor deposition [14], sputtering [15] and DC reactive magnetron sputtering [16], and pulsed laser deposition [17]. …”

Identification of optimal solar fuel electrocatalysts via high throughput in situ optical measurements

“…Nickel oxide is a highly studied anodic electrochromic material known to exhibit markedly different optical properties under OER conditions compared to ambient conditions. 32,33 Many other transition metal oxides of interest as OER catalysts have also been investigated as electrochromic materials, including oxides of Co, 34 Fe, [35][36][37] and Ir. [38][39][40] To 41 Yoshida et al have investigated the electrochromic behavior of nickel borate thin films.…”