Discussion Forum on Organic Solar Concentrators
Building the Green Economy, Quipu Economic Forum, Zero-combustion paradigm :: Comments (0)
18 May 2009 :: by J.E. Robertson
Organic solar concentrator systems make it possible for windows stained with transparent dyes to become the most efficient form of clean energy yet developed. They can be used for retrofitting or in new builds. Applications for the technology are easy to imagine, but the engineering to fit readily usable windows of all shapes and sizes with the special edge-mounted solar cells will be key to implementing the OSC paradigm globally.
Special transparent dyes coating glass or plastic panes concentrate the Sun’s rays, guiding them to solar-voltaic cells lining the edges, allowing a window to act as a solar panel with 10 times the electricity generation capacity of solar cells, by current standards. The ‘organic solar concentrator’ (OSC) system also reduces cost, by reducing the surface area that needs to be coated by solar-voltaic cells and by eliminating the need for large concentrating mirrors and sun-tracking mechanisms.
According to the journal Science, where the findings were published:
Light is absorbed by the coating and reemitted into waveguide modes for collection by the solar cells. We report single- and tandem-waveguide organic solar concentrators with quantum efficiencies exceeding 50% and projected power conversion efficiencies as high as 6.8%. The exploitation of near-field energy transfer, solid-state solvation, and phosphorescence enables 10-fold increases in the power obtained from photovoltaic cells, without the need for solar tracking.
The Economist is using the term ‘luminescent solar concentrator’, and notes that the work reported by Michael Currie and Jonathan Mapel of the Massachusetts Institute of Technology (MIT) is being researched elsewhere as well, and is related to the standard functioning of fiber optic technologies, which concentrate light and contain it within a conductive glass or plastic fiber. The OSC system conducts light toward the edges of the glass or plastic pane, trapping photons within the pane, causing it to seek out the high-efficiency solar-voltaic cells at the panel’s edge.
There are technical complications with perfecting the OSC system for harvesting solar energy. The dyes capture and concentrate the incoming sunlight, but an excess of dye molecules may prevent a quantity of light from reaching the circumferential solar cells, either by re-absorbing the light or by allowing heat to accumulate and losing the energy through that concentration of heat on the dyed surface.
The EE Times reports that the “edge-mounted” solar cells could receive light concentrated as much as 40 times. With the extreme heightening of efficiency, and the attendant reduction of costs, related to the new panels’ lack of need for mirrors or solar tracking mechanisms, the MIT advance could revolutionize the role of solar power in the global energy economy.
What can we currently do to bring this unique technology into the standard considerations for energy-efficient construction? Is marketing by private firms involved in research and production enough, or can we accelerate and/or subsidize the implementation of OSC systems?
- Read reporting from TheHotSpring.com on OSC technology
- Join the OSC discussion forum at TheHotSpring.net
