The difference in luminous transmittance (Δ T lum ) upon switching of VO 2 films strongly affects its solar controllability when used as a thermochromic window. It was found that Δ T lum is controllable by film thickness. Optical calculation for a VO 2 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 Δ T lum is located near 80 nm. An enhanced Δ T lum contributes largely to solar efficiency.
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Xu et al. (2004) studied this question.
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