Sn dopants improve the visible transmittance of VO2 films achieving excellent thermochromic performance for smart window

Zhao, Zhiyong; Liu, Yi; Wang, Dan; Ling, Chen; Chang, Qingfeng; Li, Jingbo; Jin, Haibo

doi:10.1016/j.solmat.2020.110443

Cited by 59 publications

(42 citation statements)

References 48 publications

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“…It is also known that continuous VO 2 films have a low T lum and Δ T sol ; [3,18] therefore, various synthetic and fabrication methods, under optimal thickness, have been developed to improve the thermochromic performance of these films [80–90] . Anti‐reflection properties have been induced by either coating VO 2 films with various compounds (e. g., TiO 2 , ZrO 2 , SiO 2 , CeO 2 , FTO, and AZO) or by constructing structured VO 2 (nanoparticles, porous films, and various patterned structures) [91–101] . VO 2 nanocomposites films have also been prepared to lower the transition temperature and achieve a higher T lum and Δ T sol [102–105] …”

Section: Thermochromic Smart Windowsmentioning

confidence: 99%

“…[80][81][82][83][84][85][86][87][88][89][90] Anti-reflection properties have been induced by either coating VO 2 films with various compounds (e. g., TiO 2 , ZrO 2 , SiO 2 , CeO 2 , FTO, and AZO) or by constructing structured VO 2 (nanoparticles, porous films, and various patterned structures). [91][92][93][94][95][96][97][98][99][100][101] VO 2 nanocomposites films have also been prepared to lower the transition temperature and achieve a higher T lum and ΔT sol . [102][103][104][105] Windows based on thermosensitive gels or liquids can scatter light at high temperatures (Figure 1).…”

Section: Thermochromic Smart Windowsmentioning

confidence: 99%

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Multi‐stimuli‐responsive and Multi‐functional Smart Windows

et al. 2022

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Smart windows can change their optical characteristics according to environmental conditions or external stimuli (such as heat and electricity). They are manufactured by considering building characteristics, regional climate, energy policies, and indoor air conditions. Their key optical properties have been improved by developing novel materials, fabrication methods, and designs. The optical properties can be further improved by developing multi‐stimuli‐responsive smart window systems. Recently, some smart windows have been integrated with energy storage, solar energy harvesting, self‐cleaning, and air‐purifying functions. The energy consumed by buildings and houses accounts for a considerable portion of the total energy consumed by a country as well as the world; therefore, these state‐of‐the‐art smart windows will greatly contribute to saving energy. Moreover, some multi‐functional smart windows can help in addressing environmental challenges. This mini‐review particularly focuses on discussing the recent advances made in multi‐stimuli‐responsive and multi‐functional smart windows, in addition to summarizing the researches on electrochromic, thermochromic, and other types of smart windows.

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Section: Thermochromic Smart Windowsmentioning

confidence: 99%

Section: Thermochromic Smart Windowsmentioning

confidence: 99%

Multi‐stimuli‐responsive and Multi‐functional Smart Windows

et al. 2022

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“…For example, the highly entangled and crosslinked poly (methyl methacrylate) (PMMA) showed a promising pathway toward creating environmentally stable and easily scalable thermochromic films [36]. More recently, the VO 2 was doped with tin (Sn), enhancing its visible transmittance and providing the films with excellent thermochromic properties [37].…”

Section: Optical Modulation Of Passive Daytime Radiative Coolingmentioning

confidence: 99%

Optically Modulated Passive Broadband Daytime Radiative Cooling Materials Can Cool Cities in Summer and Heat Cities in Winter

et al. 2022

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Broadband passive daytime radiative cooling (PDRC) materials exhibit sub-ambient surface temperatures and contribute highly to mitigating extreme urban heat during the warm period. However, their application may cause undesired overcooling problems in winter. This study aims to assess, on a city scale, different solutions to overcome the winter overcooling penalty derived from using PDRC materials. Furthermore, a mesoscale urban modeling system assesses the potential of the optical modulation of reflectance (ρ) and emissivity (ε) to reduce, minimize, or reverse the overcooling penalty. The alteration of heat flux components, air temperature modification, ground and roof surface temperature, and the urban canopy temperature are assessed. The maximum decrease of the winter ambient temperature using standard PDRC materials is 1.1 °C and 0.8 °C for daytime and nighttime, respectively, while the ρ+ε-modulation can increase the ambient temperature up to 0.4 °C and 1.4 °C, respectively, compared to the use of conventional materials. Compared with the control case, the maximum decrease of net radiation inflow occurred at the peak hour, reducing by 192.7 Wm−2 for the PDRC materials, 5.4 Wm−2 for ρ-modulated PDRC materials, and 173.7 Wm−2 for ε-PDRC materials; nevertheless, the ρ+ε-modulated PDRC materials increased the maximum net radiation inflow by 51.5 Wm−2, leading to heating of the cities during the winter.

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“…Other issues in the development of TC coatings for industrial applications include the stability of performance in time and increasing the modulation of visible and infrared transmittance. To reduce the T c , doping with cations larger than vanadium (such as tungsten, molybdenum, and niobium) and anions smaller than O 2-(like fluorine) is the most adopted strategy [44][45][46]. In fact, it was observed that the direction of the change in T c could be related to the relative size of the doping ion compared with vanadium [47] or to the charge-transfer mechanism associated with the introduction of extra electrons into the vanadium d bands [48].…”

Section: Thermochromic Materialsmentioning

confidence: 99%

Chromogenic Technologies for Energy Saving

Cannavale

2020

Clean Technol.

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Chromogenic materials and devices include a wide range of technologies that are capable of changing their spectral properties according to specific external stimuli. Several studies have shown that chromogenics can be conveniently used in building façades in order to reduce energy consumption, with other significant effects. First of all, chromogenics influence the annual energy balance of a building, achieving significant reductions in consumption for HVAC and artificial lighting. In addition, these technologies potentially improve the indoor level of visual comfort, reducing the risks of glare and excessive lighting. This brief review points to a systematic discussion—although not exhaustive and mainly limited to recent results and investigations—of the main studies that deal with building-integrated chromogenics that have appeared, so far, in the scientific literature.

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Sn dopants improve the visible transmittance of VO2 films achieving excellent thermochromic performance for smart window

Cited by 59 publications

References 48 publications

Multi‐stimuli‐responsive and Multi‐functional Smart Windows

Multi‐stimuli‐responsive and Multi‐functional Smart Windows

Optically Modulated Passive Broadband Daytime Radiative Cooling Materials Can Cool Cities in Summer and Heat Cities in Winter

Chromogenic Technologies for Energy Saving

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