While rooftops are the obvious place to put solar cells to generate clean electricity for the home, we’ve seen a number of technologies aimed at expanding the potential solar collecting area to include windows using transparent solar cells. These include Octillion Corp’s NanoPower Window technology, RSi’s semi-transparent photovoltaic glass windows, and EnSol’s transparent thin film. In this latest development, U.S. scientists have fabricated a new type of self-assembling transparent thin film material that could boost the cost effectiveness and scalability of solar window production.
The material, developed by scientists at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and Los Alamos National Laboratory, consists of a semiconducting polymer doped with carbon-rich fullerenes – soccer-ball-shaped, cage-like molecules composed of 60 carbon atoms. When applied to a surface under carefully controlled conditions, the material self-assembles in a repeating pattern of micron-sized hexagonal-shaped cells resembling a honeycomb over a relatively large area (up to several millimeters).
The material is largely transparent because the polymer chains pack together only at the edges of the hexagons, remaining loosely packed and spread relatively thin across the centers. The densely packed edges strongly absorb light and could facilitate electrical conductivity, while the centers don’t absorb much light and are relatively transparent, according to the researchers.
New transparent, light-harvesting material could lead to power generating windows
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