Scientists at the Oak Ridge National Laboratory have developed a coating for glass that is superhydrophobic, making it so that it will literally bounce water off the surface. This coating also decreases the amount of light that reflects away from the glass. The benefits for solar collectors are immediately evident.
The ability to be self-cleaning would be an enormous benefit for solar panels, even without the additional conversion efficiency benefits. Although many of the best locations for solar panel farms are in dusty desert climates with very little rainfall, even there, the ability to clean the solar panels with just a small amount of water and the self-cleaning ability of the panels would be a benefit, and a savings in labor and in water use.
The coating can be applied to glass in a number of different categories, including architectural purposes, and military applications, but the use of superhydrophobic coating for solar panels could be particularly beneficial:
“Where solar panels are concerned, the suppression of reflected light translates into a 3-6 percent relative increase in light-to-electricity conversion efficiency and power output of the cells. Coupled with the superhydrophobic self-cleaning ability, this could also substantially reduce maintenance and operating costs of solar panels. In addition, the coating is highly effective at blocking ultraviolet light.”
According to the ORNL press release, the coating is also highly durable, unlike other hydrophobic and self-cleaning technologies. The process to make this coating is also cost-effective, and it “can be fabricated through industry standard techniques mak[ing] it easy and inexpensive to scale up and apply to a wide variety of glass platforms.”
image via: ORNL