They found the bare device retained 80% of its efficiency over 300 hours

Thats pretty bad. A regular PV panel would hit that level of degradation after about 20 years.

indoor light

Oh man I can use my lightbulbs to generate electricity? Dude this is going to make a killing!

Fuck the years of the three laws of thermodynamics! Now is the time of the three laws of robotics!

Why not just put the solar panel next to the window so you don't have to cover it at all? The more light a panel absorbes, the more efficient it is, which is kind of the exact opposite type of thing that you would want to cover a window with if you still want it to be a window. I'm not even going to bother addressing the inefficiencies of harvesting indoor light, other than to say it's idiotic.

Can we please stop pouring money into stupid ideas? Solar windows make as much sense as a water-soluble condom. It's the kind of hair-brained shit I'd expect to see Elon touting. An invention that is the antithesis of its purpose, dreamed up and funded by some methed out moron surrounded by yes-men and brown-nosers who is so out of touch with the world that he doesn't understand the innate purpose of the object, nor the application of the technology

I can see something like this as part of a system where we harvest energy from every possible surface if eventually becomes easy enough to produce and has a decent durability.

On some windows could make sense as permanent installations and on others they could be used as movable blinds.

I've been hearing about this for years. The fact that it never materialized is a sign that it probably doesn't make sense economically.