https://techcrunch.com/2017/08/18/these-solar-glass-blocks-would-make-great-skylights-for-your-solar-roof/

If you’re going to be decking your roof out with solar tiles, there’s a possibility that you may forgo what might be the best placement of a skylight in favor of more solar cell square footage. Luckily solar glass is fast becoming an option, and these clever glass blocks are the best option I’ve seen yet.