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From: ftth6/4/2012 10:04:44 PM
1 Recommendation   of 42727
 
Sharp develops concentrator solar cell with world’s highest conversion efficiency of 43.5%

phys.org 

(Some history of solar cell efficiency:

1954: 6% efficiency
1957: 8%
1959: 10%
1960: 14%
1985: 20%
1994: 30%
2007: 42.8%
2012: 43.5%

from en.wikipedia.org  )
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