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Denayer J.,University of Liège | Bister G.,Environmental and Material Research Association CRIBC INISMa | Simonis P.,University of Namur | Colson P.,University of Liège | And 7 more authors.
Applied Surface Science | Year: 2014

Lithium-doped nickel oxide and undoped nickel oxide thin films have been deposited on FTO/glass substrates by a surfactant-assisted ultrasonic spray pyrolysis. The addition of polyethylene glycol in the sprayed solution has led to improved uniformity and reduced light scattering compared to films made without surfactant. Furthermore, the presence of lithium ions in NiO films has resulted in improved electrochromic performances (coloration contrast and efficiency), but with a slight decrease of the electrochromic switching kinetics. © 2014 Elsevier B.V. All rights reserved.


Denayer J.,University of Liège | Aubry P.,Environmental and Material Research Association CRIBC INISMa | Bister G.,Environmental and Material Research Association CRIBC INISMa | Spronck G.,University of Liège | And 6 more authors.
Solar Energy Materials and Solar Cells | Year: 2014

Tungsten oxide thin films are known for their excellent electrochromic efficiency, nevertheless, most of deposition methods reported in the literature are not suitable to produce high quality films and at low cost. In this paper, tungsten oxide thin films have been deposited on FTO-glass substrates by a surfactant-assisted ultrasonic spray pyrolysis. This deposition method, associated to the presence of surfactant, has led to improved electrochromic performance of tungsten oxide films, without excessive production cost. Tungsten oxide films made by the surfactant-assisted ultrasonic spray pyrolysis show a high specific surface area, which results in one of the highest coloration contrast (83%) ever reported for tungsten oxide thin films. WO3thin films also show excellent reversibility (94%), as well as good coloration efficiency (28 cm2/C). © 2014 Elsevier B.V.

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