> Kurzweil said their efficiency doubles every two years
According to that article, he said the "use" of solar energy doubles every two years.
Efficiency has been gradually improving, but it's definitely not doubling every two years. Every few decades would be closer; that said, using an exponential curve to model a function that's capped at 100% doesn't really make much sense in the first place.
According to that article, he said the "use" of solar energy doubles every two years.
Efficiency has been gradually improving, but it's definitely not doubling every two years. Every few decades would be closer; that said, using an exponential curve to model a function that's capped at 100% doesn't really make much sense in the first place.
http://en.wikipedia.org/wiki/File:PVeff(rev141113).jpg