Smart Window Structures Based on Highly Conductive, Transparent Metal Nanomeshes and Thermochromic Perovskite Films

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Date

2023-01-15

Authors

Wu, Shang-Hsuan
Cossio, Gabriel
Braun, Benjamin
Wu, Frances Camille M.
Yu, Edward T.

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Abstract

Smart windows are energy-efficient windows whose optical transparency can be switched between highly transparent and opaque states in response to incident solar illumination. Transparent and conductive metal nanomesh (NM) films are promising candidates for thermochromic smart windows due to their excellent thermal conductivity, high optical transparency at near infrared wavelengths, and outstanding stability. In this study, ZnO/Au/Al2O3 NM films with periodicities of 200 nm and 370 nm are reported. The ZnO/Au/Al2O3 NM film with a 370-nm periodicity exhibits a transmittance over 90% at 550 nm and sheet resistance lower than 20 Ω/sq. Based on a standard figure of merit, this structure outperforms current state-of-the-art nanomesh films. We also demonstrate the integration of ZnO/Au/Al2O3 NM films into a thermochromic perovskite (TC-PVK) smart window. The transparency of the smart window structure is manipulated by transient resistive heating to trigger the thermochromic transition to the opaque state, which can be then maintained solely by 1-sun, AM 1.5 G illumination. This climate-adaptive, low power-activated, and fast-switching smart window structure opens new pathways towards its practical application in the real world.

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