Affiliation:
1. Tianjin University
2. Tianjin SYP Engineering Glass Co., Ltd.
Abstract
Vanadium dioxide (
V
O
2
) is an ideal thermochromic smart window material for its infrared optical properties accompanied by reversible semiconductor-to-metal phase transition. However, it is still faced with insufficient solar energy modulation efficiency and low luminous transmittance. In order to further improve the thermochromic performance of
V
O
2
thin film, we proposed a
V
O
2
/
S
i
O
2
/
V
O
2
composite spherical structure film composed of a
V
O
2
/
S
i
O
2
microsphere antireflection structure and
V
O
2
single-layer film structure. This composite spherical structure film can form a Fabry–Perot cavity-like structure when
V
O
2
changes to a metal state at high temperature, which can enhance the absorption of near-infrared light. The solar energy modulation efficiency and visible light transmittance were improved simultaneously compared to a single-layer film microsphere structure with the same
V
O
2
thickness. The solar energy modulation efficiency was improved from 3.11% to 7.65% by increasing the difference in transmittance between the semiconductor phase and the metal phase, and the luminous transmittance was enhanced from 51.53% to 57.23% at the optimized top thickness of 25 nm and bottom thickness of 54 nm. This optical study of composite structure film will lay a foundation for the application of
V
O
2
film in thermochromic smart windows.
Funder
Science and Technology Program Project of Tianjin
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
4 articles.
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