High-performance thermochromic VO2-based coatings with a low transition temperature deposited on glass by a scalable technique
David Kolenatý, J. Vlček, Tomáš Bárta, J. Rezek, Jiří Houška, Stanislav Haviar
Abstract
Abstract We report on high-performance thermochromic ZrO 2 /V 0.982 W 0.018 O 2 /ZrO 2 coatings with a low transition temperature prepared on glass by a low-temperature scalable deposition technique. The V 0.982 W 0.018 O 2 layers were deposited by a controlled high-power impulse magnetron sputtering of V target, combined with a simultaneous pulsed DC magnetron sputtering of W target to reduce the transition temperature to 20–21 °C, at a low substrate surface temperature of 330 °C in an argon–oxygen gas mixture. ZrO 2 antireflection layers both below and above the thermochromic V 0.982 W 0.018 O 2 layers were deposited at a low substrate temperature (< 100 °C). A coating design utilizing a second-order interference in the ZrO 2 layers was applied to increase both the luminous transmittance ( T lum ) and the modulation of the solar transmittance (Δ T sol ). The ZrO 2 /V 0.982 W 0.018 O 2 /ZrO 2 coatings exhibit T lum up to 60% at Δ T sol close to 6% for a V 0.982 W 0.018 O 2 thickness of 45 nm, and T lum up to 50% at Δ T sol above 10% for a V 0.982 W 0.018 O 2 thickness of 69 nm.