Broadly-tunable smart glazing using an ultra-thin phase-change material

Youngblood, Nathan and Talagrand, Clément and Porter, Benjamin and Galante, Carmelo Guido and Kneepkens, Steven and Sarwat, Syed Ghazi and Yarmolich, Dmitry and Bonilla, Ruy S and Hosseini, Peiman and Taylor, Robert and Bhaskaran, Harish (2019) Broadly-tunable smart glazing using an ultra-thin phase-change material.

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Abstract

For many applications, a method for controlling the optical properties of a solid-state film over a broad wavelength range is highly desirable and could have significant commercial impact. One such application is smart glazing technology where it is necessary to harvest near-infrared solar radiation in the winter and reflect it in the summer--an impossibility for materials with fixed thermal and optical properties. Here, we experimentally demonstrate a smart window which uses a thin-film coating containing GeTe, a bi-stable, chalcogenide-based phase-change material which can modulate near-infrared absorption while maintaining neutral-colouration and constant transmission of light at visible wavelengths. We additionally demonstrate controlled down-conversion of absorbed near-infrared energy to far-infrared radiation which can be used to heat a building's interior and show that these thin-films also serve as low-emissivity coatings, reducing heat transfer between a building and its external environment throughout the year. Finally, we demonstrate fast, sub-millisecond switching using transparent electrical heaters integrated on glass substrates. These combined properties result in a smart window that is efficient, affordable, and aesthetically pleasing--three aspects which are crucial for successful adoption of green technology.

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Details

Item Type:	Article
Creators/Authors:	Creators Email Pitt Username ORCID Youngblood, Nathan nathan.youngblood@pitt.edu NAY32 0000-0003-2552-9376 Talagrand, Clément Porter, Benjamin Galante, Carmelo Guido Kneepkens, Steven Sarwat, Syed Ghazi Yarmolich, Dmitry Bonilla, Ruy S Hosseini, Peiman Taylor, Robert Bhaskaran, Harish
Date:	2019
Schools and Programs:	Swanson School of Engineering > Electrical and Computer Engineering
Refereed:	Yes
Uncontrolled Keywords:	physics.app-ph, physics.app-ph, physics.optics
Date Deposited:	04 Aug 2021 19:39
Last Modified:	21 Aug 2024 17:03
URI:	http://d-scholarship.pitt.edu/id/eprint/41571

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