[AndyJackson]

The objective of a solar cell is to absorb light and convert it to electricity, not transmit it. Every photon passed through the window/device is a photon not creating electricity. There is no mention of quantum efficiency either. But hey, I am saving up my pennies so that I can start snapping up shares of this guy’s company. [sarcasm not intended as investment advice]

[mvpel]

The objective of a solar cell is to absorb light and convert it to electricity, not transmit it. Every photon passed through the window/device is a photon not creating electricity.

There's a lot more to sunlight than just what we can see through a window.