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

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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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Item Type: Article
CreatorsEmailPitt UsernameORCID
Youngblood, Nathannathan.youngblood@pitt.eduNAY320000-0003-2552-9376
Talagrand, Clément
Porter, Benjamin
Galante, Carmelo Guido
Kneepkens, Steven
Sarwat, Syed Ghazi
Yarmolich, Dmitry
Bonilla, Ruy S
Hosseini, Peiman
Taylor, Robert
Bhaskaran, Harish
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Refereed: Yes
Uncontrolled Keywords:,, physics.optics
Date Deposited: 04 Aug 2021 19:39
Last Modified: 06 Aug 2021 04:55


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