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While the vast majority of windows in buildings and automobiles use clear glass, the desire to control energy use will drive increased adoption of smart windows. This is a market in which materials play a crucial role. NanoMarkets forecasts potential revenue of over $700 million for self-dimming smart windows materials by the year 2021.
Photochromic windows, coated with materials than darken when exposed to sunlight, are competing to gain a slice of the smart windows market. As a passive technology, it will need to be priced lower than active technologies in order to succeed. Like many materials in this crowded market, photochromic technology faces a serious uphill battle in its attempts to win market share.
Photochromic materials have been used for many years in self-dimming sunglasses, so it might seem natural for them to make the leap and start appearing in smart windows in automobiles and buildings. There are some very good reasons why this hasn’t happened so far, and why photochromic windows may not ever take an important share of the smart windows market.