Nepalese Teenager Turns Human Hair into Solar Panels

By John Farrier in Science & Tech on Sep 9, 2009 at 1:39 pm

Nepalese teenager invents solar panel with human hairEighteen-year-old Milan Karki of Nepal has invented a new type of solar panel that uses human hair as a conductor:

The hair replaces silicon, a pricey component typically used in solar panels, and means the panels can be produced at a low cost for those with no access to power, he explained….
The solar panel, which produces 9 V (18 W) of energy, costs around £23 to make from raw materials.

But if they were mass-produced, Milan says they could be sold for less than half that price, which could make them a quarter of the price of those already on the market.

Melanin, a pigment that gives hair its colour, is light sensitive and also acts as a type of conductor. Because hair is far cheaper than silicon the appliance is less costly.

Link (Photo: Tom Van Cakenberghe/Barcroft Media) – via Gizmodo


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  1. fredthesecond
    Sep 9th, 2009 at 2:40 pm

    The panel as shown in the pictures and as reported must be a hoax. It says it produces 9V (18W). This means the panel produces 2A!! This through a few hairs stretched out over some pins on a board? I don’t think so. And since when did head hair conduct electricity? Maybe at 10000V, not 9V.

  2. Kalel
    Sep 9th, 2009 at 3:15 pm

    Well, they are still combing through the data and have a few knots to work out, so don’t brush them off just yet.

  3. Xinavera
    Sep 9th, 2009 at 3:27 pm

    My human hair has been turning into solar panels since sometime in the mid-90s. I’m pleased to say that my scalp is now more than 50% solar powered except when I’m wearing a hat.

  4. craighyatt
    Sep 9th, 2009 at 3:37 pm

    Aw c’mon you guys! This is clearly a hoax. Human hair is non-conductive. To take advantage of melanin’s properties as a semiconductor you’d have to isolate it chemically from the hair. Since hair isn’t a conductor, clearly you can’t just string a bunch of it in a loop. And just to check, I measured a lock of my wife’s jet black hair. Non-conductive. No energy produced under UV illumination. Here is a photo: http://sites.google.com/site/edwardcraighyatt/CraigsProjects/gizhair.j pg?attredirects=0 At best, this boy is fooling himself. At worst, he’s a liar. Shame for publishing this without any fact checking.

  5. semi
    Sep 9th, 2009 at 5:08 pm

    Why does Neatorama have absolutely no critical thinking skills? That’s the only explanation for falling for a hoax like this.

  6. FishBottleT
    Sep 9th, 2009 at 5:11 pm

    It would be neat though. I think that making these alternative energy sources less costly to produce will encourage people and developers to use more of the “green” technologies.

  7. teqjack
    Sep 9th, 2009 at 10:36 pm

    Fred: “And since when did head hair conduct electricity?”
    Craighyatt: “Human hair is non-conductive.”

    Uh, guys, Edison used hair for the filament in a series of his attempts at producing a commercial light bulb. OK, didn’t work all that well, but it did work…

    Still I agree, this thing does not seem right.

  8. Thebes
    Sep 10th, 2009 at 2:13 am

    Even if this WERE real, the mentioned price point is not so revolutionary as to represent a significant savings in an off-grid residential photovoltaic system. Considering the price of putting a frame around it, and considering that hair probably ages FAR worse in sunlight than silicone wafers, it might not represent ANY savings at all over the lifespan of the panel.

    Add to this the cost of charge controller, wiring (low voltage high amperage DC wires tend to be large and expensive), fuses, combiner boxes, panel mounts, batteries, and presumably an inverter… and even if the panels cost only 2 dollars a watt complete and in frames, you can see that the savings for a complete system is under 20%.

    I’ll stick with my proven solar panels, I have neighbors who’ve had theirs for 20 years with very little loss of output.

  9. Dibyamani
    Sep 10th, 2009 at 2:20 am

    This is crap. If everybody is to believe this then everyone should have their head shaved off for fear of being electrocuted by their own hair! Shampoo comanies, watch out.

  10. craighyatt
    Sep 10th, 2009 at 11:16 am

    “Uh, guys, Edison used hair for the filament in a series of his attempts at producing a commercial light bulb. OK, didn’t work all that well, but it did work…”

    @teqjack Hi. The source I read says that he tried many materials such as paper and cloth, thread, fish line, spruce, hay, cork, and “hair out of a red-headed Scotsman’s beard” but the fact that he tried these materials doesn’t mean any of them are conductors. Edison did experiment with *carbonized* filaments made from different organic materials. I am absolutely positive that human hair isn’t a conductor at the voltages mentioned in this article. One additional comment: It looks to me like the filaments interconnecting the gold-like posts in the photos are thin metal wires, not hairs. I am not certain,but I think the black material behind the plastic backing is the human hair. My guess is that the gold-like posts just connect the cells together. Hard to tell from the photos.

  11. Solar Book
    Sep 10th, 2009 at 1:07 pm

    “Hair out of a red-headed Scotsman’s beard”? Now that sounds like a fairly specific niche!

    The only way I can think of that may work is if there is a coating around the outside of the hair that conducts electricity. But even then, I’m struggling to see how this could possibly work.

    Hair today and gone tomorrow? Probably – but I’d love to be proved wrong.

  12. bernard asane
    Oct 16th, 2009 at 7:54 am

    plz i need a book that will help me to do some ofthe solar panels in my velage

  13. Solar Energy
    Oct 17th, 2009 at 11:31 am

    I think it’s great that people are thinking up wild ways to provide cheaper energy. I don’t know if this is the next big thing, or if it will be something else, but 10 years from now there will be some great idea that works!

  14. pat
    Nov 4th, 2009 at 11:49 am

    hair contains melanin, as stated. melanins when doped with iodine turn into semiconductors. solar panels are semiconductor. i dunno, maybe iodine doped hair is photovoltaic, but 18W sounds a bit iffy. maybe 18mW?

  15. jack888
    Dec 28th, 2009 at 4:56 am

    is if there is a coating around the outside of the hair that conducts electricity. But even then, I’m struggling to see how this could possibly work.how to build a solar panel


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