Solar Power Technology Claims Misleading

A new type of solar cell has recently gained attention as a possible cost-effective way to turn sunlight into electricity. Made from organic materials, the cells are cheaper and more flexible than currently used silicon-based solar cells.

But new information suggests organic solar cells may not work as well as advertised.

"There is a lot of press about breakthroughs that are basically unsubstantiated," said Keith Emery of the National Renewable Energy Laboratory in Golden, Colo.

In the November issue of Materials Today, an international review magazine, Emery and 20 other experts have signed a letter asking for more restraint in organic solar cell publicity. They think claims of "world record" performance must be independently verified.

Such independent evaluation is customary practice for all other solar cells, said Emery, who has done this sort of testing for 27 years.

"I have no interest in one solar cell technology over another," he told LiveScience. "But there needs to be a level playing field."

Organic market

Organic solar cells are the new kids on the block. Because they are essentially plastic, they can be cheaply manufactured and even painted onto a surface.

Sunlight striking one of these cells creates separate positive and negative charges that can move through the material. The trouble that organics run into is that these charges often recombine before they can be corralled into a wire to generate a current.

Because of this, typical organic solar cells are only able to convert 3 percent of incoming sunlight into electricity. In comparison, most silicon-based solar cells have so-called efficiencies of around 12 percent.

But manufacturing silicon is not cheap. The current cost of electricity from silicon-based solar panels for houses or businesses is 25 cents to 40 cents per kilowatt-hour, roughly triple what most people pay their utility company.


Source: http://www.livescience.com/technology/071101-organic-solar.html