Solar energy collector having solar selective coating of low reflectance
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United States of America Patent
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Jun 15, 1982
Issued Date -
N/A
app pub date -
Jun 23, 1980
filing date -
Jun 23, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solar energy collector and process for its preparation are disclosed in which the collector has a solar selective layer of overlying, multiple coatings. The first coating is a reflective metal; the second coating is a semiconductor material being absorbent in the solar spectrum; and the third coating being the coating exposed to solar radiation is a dielectric material defining an anti-reflection guard. The dielectric coating is transparent to radiation in the solar spectrum and has a relatively low refractive index. The thickness of the dielectric coating is of a magnitude to decrease reflectance from the semiconductor coating by destructive interference. The solar selective layer may be prepared by depositing the various coatings in sequence as by thermal evaporation techniques.
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