Tailoring of Luminous Transmittance upon Switching for Thermochromic VO2 Films by Thickness Control

概要

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The difference in luminous transmittance ($\Delta T_{\text{lum}}$) upon switching of VO2 films strongly affects its solar controllability when used as a thermochromic window. It was found that $\Delta T_{\text{lum}}$ is controllable by film thickness. Optical calculation for a VO2 film on quartz glass revealed that the low-temperature semiconductor phase exhibits lower $T_{\text{lum}}$ than the high-temperature metallic phase for thickness below 50 nm, while the relationship is reversed above 50 nm. The calculation was confirmed by film deposition and measurement. Maximum $\Delta T_{\text{lum}}$ is located near 80 nm. An enhanced $\Delta T_{\text{lum}}$ contributes largely to solar efficiency.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2004-01-15