Effect of buffer layer on thermochromic performances of VO2 films fabricated by magnetron sputtering

Zhu, B.Q.; Tao, Haizheng; Zhao, Xiujian

doi:10.1016/j.infrared.2016.01.004

Cited by 47 publications

(18 citation statements)

References 18 publications

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“…Comparison of the solar energy regulation ability (DT sol ) and luminous transmittance (T lum ) values for various VO 2 -based smart-windows. References (50)(51)(52)(53)(54)(55)(56)(57)(58)…”

Section: Supplementary Materialsmentioning

confidence: 99%

Gate-controlled VO ₂ phase transition for high-performance smart windows

et al. 2019

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Vanadium dioxide (VO2) is a promising material for developing energy-saving “smart windows,” owing to its infrared thermochromism induced by metal-insulator transition (MIT). However, its practical application is greatly limited by its relatively high critical temperature (~68°C), low luminous transmittance (<60%), and poor solar energy regulation ability (<15%). Here, we developed a reversible and nonvolatile electric field control of the MIT of a monoclinic VO2 film. With a solid electrolyte layer assisting gating treatment, we modulated the insertion/extraction of hydrogen into/from the VO2 lattice at room temperature, causing tristate phase transitions that enable control of light transmittance. The dramatic increase in visible/infrared transmittance due to the phase transition from the metallic (lightly H-doped) to the insulating (heavily H-doped) phase results in an increased solar energy regulation ability up to 26.5%, while maintaining 70.8% visible luminous transmittance. These results break all previous records and exceed the theoretical limit for traditional VO2 smart windows, making them ready for energy-saving utilization.

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Section: Supplementary Materialsmentioning

confidence: 99%

Gate-controlled VO ₂ phase transition for high-performance smart windows

et al. 2019

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“…2a). As for solar modulation ability, the majority of reported modulation abilities are less than 10%, which are not efficient enough for energy saving function [62][63][64][65]. For VO 2 coatings before and after the phase transition, the contrast of relative optical transmittance is mainly in the near-infrared region (780-2 500 nm), which only accounts for 43% of solar energy in the solar spectrum (see Fig.…”

Section: Improvements Of Optical Propertiesmentioning

confidence: 99%

“…Besides the antireflection layers on the top of VO 2 films, buffer layers between the substrates and VO 2 films also play important roles in the optical performances of integrated coatings. Some buffer layers as SiO 2 , TiO 2 , SnO 2 , ZnO, CeO 2 , and SiN x have been investigated in reported works [75][76][77][78]. Nevertheless, thermochromic performances of VO 2 coatings obtained based on above buffer layers are fair, which still can not match the requirements for practical applications.…”

Section: Multilayer Design For Vo 2 Thin Filmsmentioning

confidence: 99%

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

Ducato¹,

Buffa

Fratini³

et al. 2015

Adv. Manuf.

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With an urgent demand of energy efficient coatings for building fenestrations, vanadium dioxide (VO 2 )-based thermochromic smart coatings have been widely investigated due to the reversible phase transition of VO 2 at a critical transition temperature of 68°C, which is accompanied by the modulation of solar irradiation, especially in the near-infrared region. As for commercial applications in our daily life, there are still some obstacles for VO 2 -based smart coatings, such as the high phase transition temperature, optical properties (luminous transmittance and solar modulation ability), environmental stability in a long-time period, as well as mass production. In this review, recent progress of thermochromic smart coatings to solve above obstacles has been surveyed. Meanwhile, future development trends have also been given to promote the goal of commercial production of VO 2 smart coatings.

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“…In any case, to switch between the heating and cooling states the intelligent windows should allow large difference in its transmittance/reflectance properties between the two states, while always featuring low absorption of solar radiation [38]. Therefore, much attention was payed to improving the performances of the smart windows through materials research and structural optimization [35,[40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Simple models for the operation of partially transparent radiative windows and their comparison to the radiative coolers

Skorobogatiy¹,

Caloz²,

Zhung³

2019

Preprint

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In this work we solve approximately the radiative heat transfer problem in one dimension to perform a comparative analysis of the time averaged performance of the partially transparent radiative windows and radiative coolers. Our physical model includes the atmosphere, the window, and the backwall that are all in the thermal equilibrium with each other, and that can exchange energy via radiative heat transfer or convection. Moreover, we use a simplified two-state model for the optical properties of an atmosphere and a window material which assumes two distinct sets of the optical reflection/absorption/transmission parameters in the visible/near-IR versus mid-IR spectral ranges. Furthermore, we have distinguished the design goals for the partially transparent windows and radiative coolers and provided optimal choice for the material parameters to realize these goals. Thus, radiative coolers are normally non-transparent in the visible, and the main goal is to design a cooler with the temperature of its dark side as low as possible compared to that of the atmosphere. For the radiative windows, however, their surfaces are necessarily partially transparent in the visible. In the cooling mode, therefore, the main question is about the maximal visible light transmission through the window at which the temperature on the window somber side does not exceed that of the atmosphere. We believe that our simple physical models complimented with an in-depth comparative analysis of the radiative windows and coolers can be of interest to a number of scientists and engineers pursuing research in these disciplines.

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Effect of buffer layer on thermochromic performances of VO2 films fabricated by magnetron sputtering

Cited by 47 publications

References 18 publications

Gate-controlled VO ₂ phase transition for high-performance smart windows

Gate-controlled VO ₂ phase transition for high-performance smart windows

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

Simple models for the operation of partially transparent radiative windows and their comparison to the radiative coolers

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Effect of buffer layer on thermochromic performances of VO2 films fabricated by magnetron sputtering

Cited by 47 publications

References 18 publications

Gate-controlled VO 2 phase transition for high-performance smart windows

Gate-controlled VO 2 phase transition for high-performance smart windows

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

Simple models for the operation of partially transparent radiative windows and their comparison to the radiative coolers

Contact Info

Product

Resources

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Gate-controlled VO ₂ phase transition for high-performance smart windows

Gate-controlled VO ₂ phase transition for high-performance smart windows