July/August 2008
Solar Costs Heading Down
Silicon shortages drove up prices, but supplies are now increasing.
By Kevin Bullis
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Solar commodity: Most silicon solar cells use polysilicon, shown here.
Credit: Courtesy of Wacker Chemie Ag |
In 2003, the spot-market price of a kilogram of silicon used for solar cells was $24.
But by 2007, it was $400.
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Massachusetts Institute of Technology