Preparation and investigation of sputtered vanadium dioxide films with large phase-transition hysteresis loops

Zhang, Huafu; Wu, Zhiming; He, Qiong; Jiang, Yadong

doi:10.1016/j.apsusc.2013.04.028

Cited by 31 publications

(28 citation statements)

References 25 publications

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“…The situation is further complicated as doping with high valency metals also impacts upon the thermochromic efficiency, usually in a detrimental manner [179][180][181][182][183]. The use of polymer templates and surfactants has also been shown to change the surface microstructure and thus the thermochromic efficiency [176,184]. In some cases VO 2 films that consisted of nanoparticles have been found to result in wider hysteresis widths (10-20 • C), although they tended to have lower critical transition temperatures (~40 • C) [150], it has been suggested that the hysteresis width is inversely proportional to the average crystallite and grain sizes of the materials [185,186] however, this is not found to be the case in all studies [163].…”

Section: Improving Thermochromic Efficiencymentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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Functional thin films provide many opportunities for advanced glazing systems. This can be achieved by adding additional functionalities such as self-cleaning or power generation, or alternately by providing energy demand reduction through the management or modulation of solar heat gain or blackbody radiation using spectrally selective films or chromogenic materials. Self-cleaning materials have been generating increasing interest for the past two decades. They may be based on hydrophobic or hydrophilic systems and are often inspired by nature, for example hydrophobic systems based on mimicking the lotus leaf. These materials help to maintain the aesthetic properties of the building, help to maintain a comfortable working environment and in the case of photocatalytic materials, may provide external pollutant remediation. Power generation through window coatings is a relatively new idea and is based around the use of semi-transparent solar cells as windows. In this fashion, energy can be generated whilst also absorbing some solar heat. There is also the possibility, in the case of dye sensitized solar cells, to tune the coloration of the window that provides unheralded external aesthetic possibilities. Materials and coatings for energy demand reduction is highly desirable in an increasingly energy intensive world. We discuss new developments with low emissivity coatings as the need to replace scarce indium becomes more apparent. We go on to discuss thermochromic systems based on vanadium dioxide films. Such systems are dynamic in nature and present a more sophisticated and potentially more beneficial approach to reducing energy demand than static systems such as low emissivity and solar control coatings. The ability to be able to tune some of the material parameters in order to optimize the film performance for a given climate provides exciting opportunities for future technologies. In this article, we review recent progress and challenges in these areas and provide a perspective for future trends and developments.

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Section: Improving Thermochromic Efficiencymentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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“…In this case, we consider the phase transition temperature of the sample is decided by the major peak. The phenomenon is not the first time to be observed successfully and previous publication also mentions the two-step phase transition [28].…”

Section: Mit Characteristics Of the Filmsmentioning

confidence: 89%

“…However, from 3 to 3.5 slpm, T Cooling has a slight increasing although the grain size decreases. And pores which belong to a kind of structural defects can be the main factor that leads to the increasing of T Cooling [28]. T MIT also shows certain regularity, and it reduces monotonically as O 2 flow rate changes from 3 to 4.5 slpm.…”

Section: Mit Characteristics Of the Filmsmentioning

confidence: 93%

Effect of O2 flow rate in the annealing process on metal–insulator transition of vanadium oxide thin films

Liang

et al. 2015

J Mater Sci: Mater Electron

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Vanadium oxide (VO x ) thin films were fabricated on the sapphire substrates by sputtering deposition and subsequent rapid-thermal-annealing (RTA) process. The effect of O 2 flow rate on the crystal structure, surface morphology and phase transition property of thin films was studied. The results indicated that VO x thin films were polycrystalline structures and consisted of irregular blockyshaped grains. As the O 2 flow rate increased from 3 to 4.5 slpm, the oxidation was enhanced and the grain size decreased gradually. In addition, when we increased O 2 flow rate, phase transition amplitude increased from 5.4 to 117 and the phase transition temperature decreased from 50.45°C to 45.37°C. The hysteresis width almost increased as O 2 flow rate increased. More interesting, we found that the value of d lg R h =dT became big at high temperature which could be attributed to the phase transition and the variation trend of difference was in line with the phase transition amplitude. So, it could be concluded that O 2 flow rate in the RTA process played a significant role in the properties of VO x thin films.

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“…1), there may be a diffusion of Na in to the VO 2 films [23] shows a T C of about 54.5  C. The low T C of VO 2 films indicates that the MIT upon cooling undergoes a significant lagging. In other words, as reported also by H. Zhang et al [24], the deposited films would require large additional driving forces in order to change from tetragonal to monoclinic phase. This could be attributed to the lack of nucleating defects and the large interfacial energies, which are determined by the characteristics of the particles in the deposited films, namely the small grain size resulting from low substrate deposition temperature.…”

Section: Fig3cmentioning

confidence: 91%

“…This could be attributed to the lack of nucleating defects and the large interfacial energies, which are determined by the characteristics of the particles in the deposited films, namely the small grain size resulting from low substrate deposition temperature. The smaller the grain size, the smaller the density of nucleating defects [24][25][26].…”

Section: Fig3cmentioning

confidence: 99%

Effect of substrate temperature on the structure and the metal insulator transition in pulsed laser deposed V02\ films on soda lime glass

Diallo

Ndiaye

Ngom

et al. 2015

J Opt

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In this paper, we report the effect of soda lime substrate deposition temperature (T s ) on the crystal structure and the metal insulator transition of VO 2 thin films. Samples were deposited at substrate deposition temperature ranging from 450 to 600 0 C by pulsed-laser deposition and characterized by x-ray diffraction and UV-VIS spectrophotometer. At a substrate temperature of 550°C, the VO 2 (100) reflection dominate the spectrum showing a change in crystalline grains orientation. The highest transition temperatures of 74 o C with the lowest hysteresis width of 11 o C were obtained on the same sample grown at a substrate deposition temperature of 500 o C and also corresponding to the largest grains size of a value of 350 nm.

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Preparation and investigation of sputtered vanadium dioxide films with large phase-transition hysteresis loops

Cited by 31 publications

References 25 publications

Thin Films for Advanced Glazing Applications

Thin Films for Advanced Glazing Applications

Effect of O2 flow rate in the annealing process on metal–insulator transition of vanadium oxide thin films

Effect of substrate temperature on the structure and the metal insulator transition in pulsed laser deposed V02\ films on soda lime glass

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