Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster I

HL 30.6: Poster

Dienstag, 17. März 2020, 13:30–15:45, P3

HyGlas - a novel approach for smart windows as energetically efficient hybrid double-skin facades using electrochromic WO₃ thin films. — •Florian Kuhl, Angelika Polity, and Peter J. Klar — Institute of Experimental Physics I and Center for Materials Research (ZfM/LaMa), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, DE-35392 Giessen, Germany

Since about 40 % of the global energy demand and one third of CO₂ equivalent is consumed by buildings and for example their climate control, smart windows that are commercially available can be used to reduce this energy demand in the following years. However, as of 2050 the existing political concepts of the BRD and EU claim a completely climate-neutral building stock. In general there is a focus on minimizing the cooling load in summer and the heating demand in winter which can be put into practice by using the solar energy stored between the glazings of a facade. We introduce the idea of integrating differently switchable electrochromic smart windows combined with venting systems for the whole facade system in the Framework of the HyGlas project. A commercially available electrochromic smart window, whose transmittance can be switched in the visible range of the solar spectrum, will be extended by a second electrochromic multilayer system that can be modulated in the infrared region. For this purpose we investigate rf-sputtered WO₃ thin films in terms of their structural, stoichiometrical and compositional properties as well as in their electrochemical and optical behaviour, i.e. the modulation of the transmittance in the intended range of the solar spectrum.