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    Solar Paint Converts Light to Electricity

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    Instead of installing solar panels on your roof—how about just giving your house a new paint job? Of course you’d have to be sure to use solar paint. That’s what a group of Notre Dame researchers has created, detailing the recipe in the journal ACS Nano. [Matthew P. Genovese, Ian V. Lightcap, and Prashant V. Kamat, "Sun-Believable Solar Paint. a Transformative One-Step Approach for Designing Nanocrystalline Solar Cells"]

    The paint contains nanoparticles of titanium dioxide—which gives whiteness to sunscreen and powdered sugar. The particles are coated with semiconducting cadmium nanocrystals, and mixed with water and alcohol, to create a golden yellow paste. The researchers dubbed the product “Sunbelievable.” They brushed it onto a conductive glass electrode, and attached that to a counter-electrode, to create a complete circuit.

    When they shined light on the tiny solar cell, it pumped out a small current. The efficiency of the light-to-electricity conversion was only about one percent—much lower than the 10 to 15 percent efficiency of conventional silicon cells.

    But the researchers say this paint is relatively cheap, can be made in any color, and doesn’t require a clean room to manufacture, like silicon cells—just a bench top. If they can up the efficiency a bit, a future Tom Sawyer could make an electric fence.

    —Christopher Intagliata

    [The above text is a transcript of this podcast.]

    Follow Scientific American on Twitter @SciAm and @SciamBlogs. Visit ScientificAmerican.com for the latest in science, health and technology news.
    © 2012 ScientificAmerican.com. All rights reserved.

     

    63 comments

    • kevin  •  4 mths ago
      That's great for electric fences and a small number of other uses, if the they get the % up. Does Yahoo do any articles on Algae? It can be made into ethanol, gasoline, diesel, jet-fuel, and other bio-fuels. One acre can make over 20,000 gallons of oil a year, and the plant "pulp" can be used as feed, fertilizer, or even be converted to ethanol. It eats CO2 and makes oxygen, its doesn't need fresh water, and can be grown almost anywhere.
      • Rhonda 4 mths ago
        Yes! - and algea can convert carbon emmisions if grown close to power plants.
      • Mariah 4 mths ago
        That's fantastic!! Why isn't the government focusing on this?? Okay, I suppose that was a dumb question.
      • Skylar Duncan 4 mths ago
        Exxon has built an algae plant near San Diego and is working on this now.
    • Huey  •  Cypress, California  •  4 mths ago
      Just don't license it to the Chinese like we have done with other technologies!
      • troy 4 mths ago
        they'd just put lead in it anyways
      • Shannon K 4 mths ago
        License? China doesn't need no stinkin license...they have hackers.
      • Topsy 4 mths ago
        Problem: it's MUCH cheaper to manufacture practically anything in China, so the inventors have no incentive to make it here. Too bad.
    • Timk  •  Phoenix, Arizona  •  4 mths ago
      anything is better then dirty air.and something is better then nothing.
      • jnm 4 mths ago
        When you say "anything", just remember the Law of Unintended Consequences.
      • Bob Smith 4 mths ago
        Law of Unintended Consequences... ie. Obama as President
    • M and J  •  Hillsboro, Oregon  •  4 mths ago
      Slightly misleading article. Read fine print: Must be painted onto conductive glass electrode. How many homes are made of conducting glass? Yeah, thats what I thought. But bravo on the innovation front there boys :) Im sure maybe a high-rise building or something might be able to make use of it.
      • Josie Buchanan 4 mths ago
        actually you can get siding that has the same conductivity made to paint over. Then its possible for this thing to work. this is worth investigating further.
      • Rhonda 4 mths ago
        There's nothing misleading about this article. I guess "fine print" is anything other than the headline?
      • A Yahoo! User 4 mths ago
        The whole point is that it is a low cost alternative. House Siding is common, and the paint could be factory applied to the siding. No-one expects the existing homes to have an acceptable substrate. But siding is replaced every 10 years or so.
    • James  •  4 mths ago
      By itself this isn't a major breakthrough, but remember that the fast and efficient car you drive today started out as the tin lizzy of 100 years ago. There's so much more to learn.
      • robd 4 mths ago
        Yes it takes time to develop these products and industries, 100 years ago you would have been hard pressed to find any kind paved roads outside of cities. The tin lizzy is a good example, at the time it was one of best cars for the money, now we have cars that is capable of 200 miles an hour, cars that are capable of 50 MPG, but it took time to get there.
      • Bob Smith 4 mths ago
        Time is not a luxury that we have very much of now.
    • Anonymous  •  4 mths ago
      Silly scientists, creating new industries, we should be concentrating on jobs!!!

      Oh... wait....
    • carlo  •  New York, New York  •  4 mths ago
      produce it here and not china.
      Stop giving our inventions to china.
    • Dataman  •  4 mths ago
      This is cool. Now, how about sound-absorbing paint for noisy shopping malls?
    • Robert  •  Westfield, Massachusetts  •  4 mths ago
      I can see it now...my dog pees on the side of the house and gets electrocuted.
    • frosty  •  Houston, Texas  •  4 mths ago
      so that means 1% instead of 10%. Since solar panels require a flat surface somewhere, you could paint the entire surface of a house where it wouldn't be practical to place a panel. This should more than make up the difference in efficiency. They did say it was cheap. So where can we buy it?
    • wow  •  4 mths ago
      Great! We should ll use metal housing (roof and walls) and the paint on the metal to generate electricity!
    • J  •  Pittsburgh, Pennsylvania  •  4 mths ago
      awesome
    • Egore  •  Washington, District of Columbia  •  4 mths ago
      Hemp - natures solar energy converter.
    • QXR  •  4 mths ago
      Out Standing Product, think of the electricity that can be created for the price of the paint.
      and the conversion accessories. Cudos
    • part time  •  Dallas, Texas  •  4 mths ago
      Well, by the time they license it to Glidden or Behr, or whoever, it will cost $200 a gallon.
    • Harry  •  San Jose De Guaymas, Mexico  •  4 mths ago
      What is replaced are the solar cells which are made from silicon and not the electrodes. The manufacture of silicon wafers is still quite expensive and for most of the time solar cells were made from rejected wafers of the electronics industry. There are wafers made now just for solar but still expensive. If this technology can be perfected, it might be alternative to the silicon wafers.
    • CP  •  4 mths ago
      make all exterior paint that way and it reduce our coal/hydro/nuk usage by.........
    • btheman.org  •  Riverview, Florida  •  4 mths ago
      Mental note- No more powdered sugar on the french toast.
    • Glen  •  St Paul, Minnesota  •  4 mths ago
      The article states "The particles are coated with semiconducting cadmium nanocrystals". I thought cadmium is toxic. If so, wouldn't we then end up running into the same trouble down the road as we currently are with old leaded paint if this cadmium containing paint were used on a scale widespread enough to generate significant electricity?
    • Pauly  •  Portsmouth, New Hampshire  •  4 mths ago
      This is just a start...like any new discovery, there is always room for advancement in efficiency. I have faith that the folks who made the discovery are already trying to figure out how to make it most efficient and with the most practical application. Who knows, eventually anything that can be painted could use this. It has the potential to take a huge burden off of our current system. Now the question is whether big Power Corporations will fight this, or possibly buy up this company and make this product way over priced knocking out any chance of possible competition with Big Corp. Sadly, we rely on working all of the time in order to afford to have just the basics. So a discovery like this that has the potential of bringing virtually free energy to every household would create waves of job losses at traditional suppliers. As long as the only purpose we serve is to work, I doubt Big Corp would try to stop any type of discovery that would render them useless. We have the potential to a sustainable lifestyle - we already have many other options...but we only think with a profit driven mentality..if we can't make money off of something then it isn't worth doing...even if it makes every human's life so much easier for many generations. It's pretty sad that we have the technology for everyone on the planet to have running water, electricity and bathrooms, fresh food...but instead we go to war to keep others from having what we have. It would be nice to have everyone think of each other as humans instead of solely based on where you were born. If we all worked as a team, our potential could be endless. It's a fantasy
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