COMPOSITION, ANTIREFLECTION FILM SUBSTRATE, AND SOLAR CELL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a composition from which a silica film having a low refractive index and stability against moisture changes can be formed, and to provide an antireflection film substrate made from the composition.

SOLUTION: The composition contains a silicon compound and is characterized in that: when the composition is applied on a substrate and baked at a temperature of 400°C to 450°C for one minute or longer up to one hour, the obtained film has a refractive index of not more than 1.25; and when the composition is baked at a temperature of 400°C to 450°C for one minute or longer up to five hours, the obtained powder shows a water vapor adsorption difference Δ of not more than 0.03 g/g under a relative water vapor pressure in the range of 0.3

0<0.9 at 25°C.

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