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Hm. The main point of windows is to pass light. The main point of solar cells is to capture energy in the form of light. Seems like a basic purpose mismatch here... though I know there are many occasions in which we want windows to block some light, so I assume that's the effect they're going for.
That being said, I still don't see the advantage to having the battery in the same layer. Windows have frames, after all. But if the transparency could allow the battery to be integrated with the display, yes, I could see that this could make units thinner and lighter, and possibly less expensive to manufacture (though I somehow doubt it!)
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