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Abstract
Vanadium dioxide (VO2) thermochromic thin films with various thicknesses were grown on quartz glass substrates by radio frequency (RF)-plasma assisted oxide molecular beam epitaxy (O-MBE). The crystal structure, morphology and chemical stoichiometry were investigated systemically by X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. An excellent reversible metal-to-insulator transition (MIT) characteristics accompanied by an abrupt change in both electrical resistivity and optical infrared (IR) transmittance was observed from the optimized sample. Remarkably, the transition temperature (TMIT) deduced from the resistivity-temperature curve was reasonably consistent with that obtained from the temperature-dependent IR transmittance. Based on Raman measurement and XPS analyses, the observations were interpreted in terms of residual stresses and chemical stoichiometry. This achievement will be of great benefit for practical application of VO2-based smart windows.
Highlights
The continuously increasing energy consumption around the world is posing a problem to the environment, and to human health
The results indicated that the reversible metal-to-insulator transition (MIT) characteristics with narrow hysteresis width and large amplitude contrast in both IR
The MIT properties were investigated by monitoring the change in both electrical resistivity and IR transmittance across the MIT process, i.e., the samples were thermally cycled in the temperature ranging from 20 to 100 ◦ C
Summary
The continuously increasing energy consumption around the world is posing a problem to the environment, and to human health. It was highly desirable to develop some alternative technologies for heating and air conditioning systems to combat the energy crisis One of such alternatives is to construct ‘smart windows’ with thermochromic coatings, which can control the amount of solar radiation entering or black-body radiation leaving a building intelligently according to the ambient temperature [3,4,5,6]. Materials 2017, 10, 314 which have been proven as the most promising thermochromic coating for smart window application [7,8] It undergoes an abrupt reversible phase transition, known as metal-to-insulator transition (MIT) or semiconductor-to-metal (SMT) first-order transition. Our achievement will be of great benefit for VO2 -based smart window application
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