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National Geographic's Green Guide




Tips for Everyday Green Living

New Solar Cells Capture Sunlight on Cloudy Days

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A solar cell that doesn't need direct sunlight might seem like a half-baked idea. But scientists have invented solar cells that--unlike today's cells--don't need to be installed on flat surfaces, and can even collect energy from indirect sunlight.

Imagine a house where solar cells are hidden behind walls and keep producing energy when it's cloudy. Or a solar-powered car that charges while it's parked with solar cells under its surface instead of on the roof.

These new cells, which are based on the same fiber-optic technology telecommunication companies use, would make it easier for designers to incorporate solar energy into everyday items.

The new cells modify fiber optics with nanotechnology and dyes that convert light to energy. As the light bounces around in the fiber, it interacts with the dyes that convert the light into electricity. Microscopic wires "grown" on the fiber transfer electricity to a substance that carries the current away.

Some major advantages of the new technology are that the cells are inexpensive to make, flexible, sturdy, and made with environmentally safe materials.

The new cells are less efficient than the flat solar cells that most people think of today, but the researchers say they aren't meant to replace the flat panels.

"This is a different way to gather power from the sun. To meet our energy needs, we need all the approaches we can get," said researcher Zhong Lin Wang of the Georgia Institute of Technology.

The researchers have already tested a 7.8-inch (20-centimeter) long cell, though Wang plans to make the cells larger to capture even more sunlight.

Wang and colleagues estimates their new cells could be available for widespread use in five years—if enough resources are devoted to developing the technology.

James G. Robertsonjames_robertson.jpg

Related articles:

--Check out the Green Guide's energy-saving hub.

--Watch a video on new alternative energy sources.

Solar cell photograph by Gary Meek, Georgia Tech

What Others Had to Say

Added by sunrydz on November 19, 2009

A really very good performance of the researchers from Georgia, but this is nothing what new. I have introduced such 3D solar cells arrangement already July, 2009 on my web page:
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Added by Ca Mortgage on January 26, 2010

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Added by inter4522 on June 18, 2010

This technology is so good. If solar panels can get power on a cloudy day this is so good. We need to push this technology more and more.
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Added by John on June 30, 2010

Wow its a great invention!!And out of everything else absorbing solar energy indirectly is a great thought.

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Of course, solar energy is still a relatively new resource in our search for alternative energy options. While the concept of solar power has made some great strides in the past thirty years or so, proponents say that the next decade will see a number of technological improvements. These new innovations will make the harnessing of the sun’s rays even more viable as a means of not only safe and clean power to our homes but also to our businesses and municipalities as well. As we continue to refine the process of using solar energy, perhaps we can also rid ourselves of some of the misinformation about solar energy that has become part of our public consciousness. Registry Fix Review

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