It gets even better than that -- this article claims that this technique can double the output of solar cells. According to the summary however,
if you have X electrons that can be captured, then you have Y electrons that are too hot to be captured. This technique takes Y and splits it into two X-type electrons, both of which can be captured.
Before: Your output is energy from X electrons
After: Your output is energy from X + 2Y electrons.
They claim now that X + 2Y = 2X, which only happens when Y = X/2. But what if your Y value happens to be much lower than that--say Y = X/8. Then output would be X + X/4 which is not equal to 2X....