Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 43, Issue 1, Pages 186-187Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.186
Keywords
vanadium dioxide; thin film; refractive index; luminous transmittance; optical design; energy-efficient window
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The difference in luminous transmittance (DeltaT(lum)) upon switching of VO2 films strongly affects its solar controllability when used as a thermochromic window. It was found that DeltaT(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-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 DeltaT(lum) is located near 80 nm. An enhanced DeltaT(lum) contributes largely to solar efficiency.
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