Nanosolar's solar cells were verified by NREL to be as efficient as 14.6% in 2006, 15.3% in 2009, and 17.1% in 2011.
The efficiency of Nanosolar's solar cells was verified by NREL to be as high as 14.6%, 15.3%, and 17.1% over the years 2006, 2009, and 2011 respectively.