Showing papers by "Claes-Göran Granqvist published in 2018"
TL;DR: Electrochromic (EC) materials can be integrated in thin-film devices and used for modulating optical transmittance as discussed by the authors, and have been used in large-area glazing (windows and glass facades) in order to create buildings which combine energy efficiency with good indoor comfort.
329 citations
TL;DR: In this paper, the authors provide a bird's eye view over a wide class of materials of rising importance rather than giving detailed accounts of highly specialized topics, such as solar thermal converters, transparent thermal insulators, devices for radiative cooling by exposure to the clear sky, and windows and glass facades with static or dynamic properties.
45 citations
TL;DR: In this article, the authors survey recent efforts related to electrochromic films of W oxide and Ni oxide and show that electrochemical pretreatment of films in a liquid electrolyte can significantly improve durability, electrochemical posttreatment can rejuvenate degraded films, mixed oxides can have better durability, and lifetime prediction is possible.
Abstract: Most electrochromic (EC) devices must have a service lifetime of many years, and this is particularly so for “smart windows” in buildings with good energy efficiency and indoor comfort. The central part of oxide-based EC devices contains thin films based on W oxide and Ni oxide together with an interposed electrolyte. Depending on operating conditions, these films may show degradation at a slower or faster pace, and means to prevent or reverse this phenomenon, or as a minimum allow reliable lifetime prediction, have been sought ever since the beginnings of EC technology. Here we survey recent endeavors related to EC films of W oxide and Ni oxide and show that (i) electrochemical pretreatment of films in a liquid electrolyte can significantly improve durability, (ii) electrochemical posttreatment in a liquid electrolyte can rejuvenate degraded films, (iii) mixed oxides can have better durability and optical performance than corresponding pure oxides, and (iv) lifetime prediction is possible.
41 citations
TL;DR: In this paper, reactively sputter-deposited WO3 thin films, backed by indium-tin oxide layers and immersed in electrolytes of LiClO4 in propylene carbonate, demonstrate unprecedented electrochemical cycling durability after straight-forward electrochemical pretreatments.
19 citations
01 Jan 2018
TL;DR: In this article, the basics of electrochromic technology with a view toward its nanotechnology aspects, presents a case study on electro-chromic foil for glass lamination, and ventures into some forward-looking aspects.
Abstract: Electrochromic glazing (windows and glass facades) is able to change its throughput of visible light and solar energy by small amounts of electricity and can provide energy efficiency along with indoor comfort and convenience. Such glazing is available on the market since a few years and its use is expected to increase in the future. This chapter introduces the basics of electrochromic technology with a view toward its nanotechnology aspects, presents a case study on electrochromic foil for glass lamination, and ventures into some forward-looking aspects. Special consideration is given to the energy savings and other assets that are possible with electrochromic glazing.
12 citations
13 Nov 2018
TL;DR: In this article, the mechanisms underlying the optical modulation and its degrees are discussed. But, the authors focus on the Ni oxide thin films used in electrochromic (EC) devices with variable throughput of visible light and solarenergy.
Abstract: Ni oxide thin films are widely used in electrochromic (EC) devices with variable throughput of visible light and solarenergy. However, the mechanisms underlying the optical modulation – and its deg ...
9 citations
02 Nov 2018
6 citations