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October 12, 2007
Pour yourself a silicon solar panel
Pour yourself a silicon solar panel | CNET News.com
Santa Clara, Calif.-based Innovalight says it has developed a somewhat contradictory-sounding process for creating crystalline silicon solar cells with liquid. If it works in mass production, it could slash the cost of making these solar cells by half or more, the company claims.
Innovalight essentially creates silicon nanoparticles, inserts them into a solvent, and pours the solvent on a substrate. The solvent is then extracted. What is left can sort of be analogized to a snowflake or a large sugar cube: a highly organized structure made up of tiny parts.
"We use this technique to make something that isn't much different from (traditional) crystalline silicon solar panels, except we get there cheaper," CEO Conrad Burke said. "They (the solar cells) end up in a pretty structured form."
The key is that the resulting solar cell has efficiencies--or the amount of sunlight the solar cell can turn into electricity--that are closer to crystalline silicon solar cells than thin-film alternatives such as amorphous silicon or copper indium gallium selenide or CIGS.
Crystalline solar cells have higher efficiencies than thin films. Commercial crystalline panels can convert up to 22 percent of sunlight into electricity, without concentrators. CIGS makers are initially shooting for the mid to low teens. The catch is that making crystalline solar cells is expensive. The patterning and other processes is similar to what is used in making LCD panels. Innovalight says it could conceivably cut the production price by around 50 percent or more. Many start-ups, however, had hit bumps in bringing new (albeit different) manufacturing techniques for solar cells to market.
Posted by Sun at October 12, 2007 03:18 AM