Solar Cells having > 20% efficiency Hidden Under National Security

https://www.youtube.com/watch?v=aeo1UXXPcxY&feature=youtu.be

1997, “the U.S. Patent Office has classified over 3,000 patent devices or applications under the secrecy order, Title 35, U.S. Code (1952) Sections 181-188.” The Federation of American Scientists revealed that by the end of the Fiscal Year 2010, this number had ballooned to 5,135 inventions – and included “review and possible restriction” on any solar cell with greater than twenty percent efficiency, or any power system that is more that seventy to eighty percent efficient at converting energy.

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