Photochemical low-temperature synthesis of iron(III) oxide thin films

Lehnert, J.; Seifert, Lando; Dietrich, Stefan; Krautscheid, Harald; Naumov, Sergej; Prager, Andrea; Abel, Bernd; Prager, Lutz; Helmstedt, Ulrike

doi:10.1016/j.apsusc.2019.06.272

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…The formation of, i.e., alkyl acetates as organic gaseous products next to ethanol supports this hypothesis. Using iron(III) tert-butoxide dimer as the molecular precursor, we also found experimental and theoretical evidence for the formation of intermediate Fe-(OCO)-ring species, formed by abstracting a CH • 3 radical from a tert-butoxy group (With et al, 2019b). Formation of this quite stable intermediate species results in high radiant exposures of 24 J cm −2 needed for mineralization.…”

Section: Photoconversion Of Molecular Precursor Thin Films Containingmentioning

confidence: 64%

“…This yielded a fine patterning with a minimum feature size of ∼3 µm. However, a post-treatment at 200-350 • C was necessary to remove remaining organics and to FIGURE 4 | Comparison of VUV-induced (Xe 2 * excimer irradiation, in a nitrogen atmosphere with 0.25 vol% O 2 ) decomposition of different metal-organic precursor thin films depending on the applied radiant exposure at 1 bar and ≤34 • C (Prager et al, 2007;Wennrich et al, 2013;With et al, 2016With et al, , 2019b. densify the oxide network.…”

Section: Photoconversion Of Molecular Precursor Thin Films Containingmentioning

confidence: 99%

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Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Helmstedt

Prager

2020

Front. Mater.

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Photoconversion of metal-organic precursors to thin film metal oxides using ultraviolet (UV) radiation in oxidative atmosphere is an attractive technology because it can be applied at temperatures <80 • C and at ambient pressure. Thus, it enables preparing this class of thin films in a cost-efficient manner on temperature sensitive substrates such as polymer films. In this article, various aspects of research and development in the field of photochemical thin-film fabrication, with particular focus to the application of the produced films as gas permeation barriers for the encapsulation of optoelectronic devices are reviewed. Thereby, it covers investigations on fundamental photochemically initiated reactions for precursor classes containing metal-oxygen and metal-nitrogen bonds, and emphazises the relevance of that understanding for applicative considerations like integration of the single-layer barrier films into relevant encapsulation films. Further perspectives are given concerning integration of additional functionalities like electrical conductivity to the flexible and transparent barrier films.

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Section: Photoconversion Of Molecular Precursor Thin Films Containingmentioning

confidence: 64%

Section: Photoconversion Of Molecular Precursor Thin Films Containingmentioning

confidence: 99%

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Helmstedt

Prager

2020

Front. Mater.

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“…The core level spectra for the dried samples are shown in Fig. 2 [38]. With increasing drying temperature, the overall intensity of the C 1s spectra decreases relative to the V 2p 3/2 spectral area.…”

Section: Low Temperature Dryingmentioning

confidence: 99%

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

Basso¹,

Colusso²,

Carraro³

et al. 2023

Preprint

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“…DUV lamps have been mainly exploited to convert metal–organic precursors into dense and amorphous metal oxide (MO) films. With et al., clarified the difference between pure UV photochemical conversion and synergic interplay of hydrolysis and UV irradiation, i.e., UV-aided conversion of precondensed sol–gel films. They noticed that conversion by a vacuum ultraviolet excimer lamp would not occur if the films were previously hydrolyzed by exposure to ambient air .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser Crystallization Dynamics of Thermochromic VO₂ Thin Films by Simple Moisture-Assisted Sol–Gel

Basso,

Colusso,

Sgarbossa

et al. 2024

Chem. Mater.

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Vanadium dioxide (VO2) is a versatile thermochromic material exploited for multiple applications, including smart windows, gas sensing, radiative cooling, and metamaterials. Traditional methods for crystallizing solution-based VO2 thin films are usually challenging, requiring temperatures above 400 °C and strict process control to avoid unwanted oxides. Here, we adopt a synergic approach exploiting the versatility of sol–gel reactions and the ultrafast processing of pulsed laser annealing (PLA). The latter selectively heats the film with a local temperature increase, without involving the substrate over which the film is deposited. The resulting process is simple, green, and straightforward, avoiding carcinogenic vanadium precursors and not requiring a strict control of the processing atmospheres. We have found that similar values of thermochromic efficiency can be obtained within a broad working window, performing every step in air. Taking advantage of environmental moisture, the drying temperature before PLA is reduced to 100 °C, enabling a process extension to polymer substrates. VO2 (M1) crystallization is reached within only a few seconds in air, without the need for a protected atmosphere and with comparable results to furnace annealing. By combining optical spectroscopy, scanning/transmission electron microscopy, atomic force microscopy with grazing incidence X-ray diffraction, and Rutherford backscattering spectrometry, the sol–gel transition from amorphous to crystalline under PLA is investigated. The first crystallites are formed within 5 laser pulses and the sol–gel laser conversion is proposed to feature two distinct mechanisms, an initial partial photothermal ablation followed by solid-state diffusion. Simulations of the temperature distribution during single laser pulses confirm the experimental results.

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Photochemical low-temperature synthesis of iron(III) oxide thin films

Cited by 10 publications

References 40 publications

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

Ultrafast Laser Crystallization Dynamics of Thermochromic VO₂ Thin Films by Simple Moisture-Assisted Sol–Gel

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Photochemical low-temperature synthesis of iron(III) oxide thin films

Cited by 10 publications

References 40 publications

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

Ultrafast Laser Crystallization Dynamics of Thermochromic VO2 Thin Films by Simple Moisture-Assisted Sol–Gel

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Product

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Ultrafast Laser Crystallization Dynamics of Thermochromic VO₂ Thin Films by Simple Moisture-Assisted Sol–Gel