High-Performance Planar Thin Film Thermochromic Window via Dynamic Optical Impedance Matching
| Autor: | Christian Sol, Ivan P. Parkin, Stefan Guldin, Tao Li, K. L. Gurunatha, Ioannis Papakonstantinou, Mark Portnoi, Johannes Schläfer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
vanadium dioxide Impedance matching 02 engineering and technology engineering.material 7. Clean energy 01 natural sciences Amplitude modulation energy-efficient glazing Planar Coating 0103 physical sciences optical coatings General Materials Science Thin film 010302 applied physics dynamic solar control coatings thermochromic business.industry 021001 nanoscience & nanotechnology Hysteresis Optical coating smart windows thin films 13. Climate action Modulation engineering Optoelectronics 0210 nano-technology business Research Article |
| Zdroj: | ACS Applied Materials & Interfaces |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Window coatings with dynamic solar transmittance represent an excellent opportunity to reduce building heating and cooling loads, which account for >40% of energy consumed by the built environment. In particular, inorganic vanadium dioxide-based thermochromic coatings offer long lifetimes (>30 years) and can be passively integrated into a window system without additional electronics or power requirements. However, their limited solar modulation depth and wide phase-change hysteresis have traditionally restricted their ability to adapt to changing weather conditions. Here, we derive an optical performance limit for thin film vanadium dioxide coatings, which we find to be far beyond the current literature. Furthermore, we experimentally demonstrate a solution-processed multilayer thin film coating that uses temperature-dependent optical impedance matching to approach the optical performance limit. The thin film coating demonstrated has a record solar transmittance modulation of 21.8% while maintaining a high level of visible transparency (∼50%) and minimal hysteresis (∼10 °C). This work represents a step-change in thin film thermochromic window coatings and, as a result, establishes planar thin film vanadium dioxide as the most viable morphology for high-performance thermochromic windows. |
| Databáze: | OpenAIRE |
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