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- Granqvist, Claes Göran, et al.
(författare)
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Electrochromic foil-based devices : Optical transmittance and modulation range, effect of ultravioled irradiation, and quality assessment by 1/f current noise
- 2008
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Ingår i: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 516:17, s. 5921-5926
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Tidskriftsartikel (refereegranskat)abstract
- We introduce electrochromic (EC) technology for modulating the transmittance of visible light and solar radiation in window apertures, with focus on recent work on foil-type devices embodying sputter deposited WO3 and NiO films joined by a polymer electrolyte. The purpose of this paper is to present a number of new and preliminary results showing that (i) double-sided antireflection coatings based on dip coating can enhance the transmittance significantly, (ii) tandem foils can yield a ratio between bleached-state and colored-state transmittance exceeding fifty, (iii) solar irradiance onto the EC device can enhance its charge insertion dynamics and thereby its optical modulation, and (iv) electromagnetic noise spectroscopy may serve as quality assessment of EC devices.
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- Granqvist, Claes Göran, et al.
(författare)
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Oxide-Based Electrochromics for Energy Efficient Buildings : Materials, Technologies, Testing, and Perspectives
- 2007
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Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 93:1, s. 012021-
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Tidskriftsartikel (refereegranskat)abstract
- Electrochromic oxide films form the basis of "smart windows", which are of much interest in forthcoming building technology and are able to provide energy efficiency and indoor comfort simultaneously. This paper introduces "smart windows" technology, which now seems ready for large-scale applications. Electrochromics is discussed from the viewpoints of materials, device design, low-cost manufacturing, and applications to buildings as well as some niche products. Finally there are some perspectives on the future role of oxide electrochromics in the built environment.
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- Hasse, L, et al.
(författare)
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Quality assessment of varistor ZnO structures by resonant ultrasound spectroscopy
- 2009
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Ingår i: Insight. - : British Institute of Non-Destructive Testing (BINDT). - 1354-2575 .- 1754-4904. ; 51:5, s. 262-265
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Tidskriftsartikel (refereegranskat)abstract
- Varistors are produced from ZnO cylindrically-shaped structures whose quality depends on varying technological conditions at stages of their shape forming and firing. Therefore, the varistors art, tested at the final phase of production and faulty elements are excluded. We propose to test the quality of ZnO structures at an earlier stage of production to eliminate defective structures from further and expensive processing. The recommended method applies resonant ultrasound spectroscopy that meets the demand for limiting the costs introduced by an additional measurement procedure. This paper presents the prepared economical measurement system. that can be used for this purpose The proposed method measures one of the lowest resonant frequencies and dimensions of the tested specimen. The measured quantities enable the estimation of a parameter that is proportional to the sound velocity, in the tested ZnO sample and gives information about the quality of the ZnO structure. Detailed experimental data obtained for two batches of ZnO structures, oil purpose prepared in different ways, are analysed to confirm the usefulness of the applied procedure in industrial applications.
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