It's expensive and coloured instead of totally transparent but it indeed exists outside of the lab. They did build a wall out of them in my former campus:

https://en.wikipedia.org/wiki/Dye-sensitized_solar_cell

https://actu.epfl.ch/news/epfl-s-campus-has-the-world-s-firs...

Non-native English speaker here: Is there a word to describe something which is transparent but alters colour?