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bodebliss writes: Mismatch Boosts Solar Efficiency

Technology Research News April 27, 2004

One way to make solar cells more efficient is to find a material that will capture energy from a large portion of the spectrum of sunlight—from infrared to visible light to ultraviolet.

Energy transfers from photons to a photovoltaic material when the material absorbs lightwaves that contain the same amount of energy as its bandgap. A bandgap is the energy required to push an electron from a material's valence band to the conduction band where electrons are free to flow.

Most photovoltaic materials absorb a relatively narrow range of light energy, however. The most efficient silicon solar cells capture only about 25 percent. Multijunction solar cells made from several different materials boost efficiency as high as 36 percent, but are relatively difficult to make and therefore expensive.

Researchers from Lawrence Berkeley National Laboratory, the University of California, and MIT have engineered a single material that contains three bandgaps and is capable of capturing more than 50 percent of the sun's energy. The researchers made the material by forcing oxygen into a zinc-manganese-tellurium crystal. The oxygen split the crystal's band gap and formed a third one of its own.

The material could lead to relatively inexpensive, highly efficient solar cells that would be much simpler to make than today's high-end multijunction solar cells.

It will take to three years to assess the technical feasibility of the multiband solar cell, according to the researchers. The work appeared in the December 12, 2003 issue of Physical Review Letters.

http://www.technologyreview.com/articles/rnb_042704.asp?p=1


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