The OP apparently did not read the original article, or did not understand it.
The 40% efficiency is achieved through optically concentrating the sunlight onto the solar cell. This new tech is in effect the equivalent of holding a magnifying glass over the solar cell.
This is great for small solar arrays, but the efficiency will not scale up for anything too large, certainly not anything as massive as a square 265 miles to a side, as the optical concentrators will be stealing sunlight from neighboring cells, nullifying the effect.
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Google hires away MS's top talent, and people are shocked when they start to act like MS?
The OP apparently did not read the original article, or did not understand it.
The 40% efficiency is achieved through optically concentrating the sunlight onto the solar cell. This new tech is in effect the equivalent of holding a magnifying glass over the solar cell.
This is great for small solar arrays, but the efficiency will not scale up for anything too large, certainly not anything as massive as a square 265 miles to a side, as the optical concentrators will be stealing sunlight from neighboring cells, nullifying the effect.