Self-Assembling Photovoltaic Cells

dhj writes "MIT scientists have developed a self-assembling photovoltaic cell in a petri dish. Phospholipids (think cell membranes) form disks which act as the structural support for light responsive molecules. Carbon nanotubes help to align the disks and conduct electricity generated by the system with 40% efficiency. The assembly process is reversible using surfactants to break up the phospholipids. When filters are used to remove the surfactants the system reassembles with no loss of efficiency even over multiple assembly/disassembly cycles. The results were published September 5th in Nature Chemistry."

Comments

Like this story from before?

[PCPackrat]

http://science.slashdot.org/story/10/09/07/0424217/Self-Assembling-Photovoltaic-Tech-From-MIT

Re:Like this story from before?

[Required Snark]

Yes. The story was disassembled into it's component letters and then reassembled to harvest more Slashdot trolls. Recycling at it's most efficient.

Re:40%!

[Black Gold Alchemist]

FYI, at 20 percent efficiency in California, here's the math. One watt-peak = 2 kWh/year. One house = 11040 kWh /year, thus = 5520 watts peak.
At 1 kW/m^2 (100 percent), you get 5.5 m^2, which means 2.3 meters (7.7 feet) on a side.
At 40 percent, you get 13.7 m^2 = 3.7 meters (12 feet) on a side.
At 20 percent you get 27.6 m^2 = 5.5 meters (17.23 feet) on a side.
At 10 percent you get 55.2 m^2 = 7.4 (24.3 feet) meters on a side.

Re:40%!

[zrbyte]

40% is just the efficiency of the individual molecules in converting photons to electric charge. The overall efficiency of the device must be abysmal. The real breakthrough here lies in the fact that these guys can disassemble and reassemble the component light harvesting molecules of the device. This is important since photovoltaic devices using organic molecules are prone to degradation during irradiation by sunlight (see: http://en.wikipedia.org/wiki/Polymer_solar_cell).