Will this type of solar cell crash against a RoHS brick wall even if results in a good, convenient, efficient and cheap development because contains lead ?

Or has it already been discarded/discouraged as solar cells production alternative ?

It might need to be demonstrated that toxic material doesn't leach out under ordinary circumstances and maybe recycling/disposal facilities need to be in place ahead of approvals for use rather than as an afterthought. I think this kind of whole of life-cycle management increasingly applies to everything we do at large scale, not just Perovskite solar - because most of our activities are so large scale that 'big world, puny humans' no longer applies.

Whether alternatives to lead compounds in perovskite solar cells can be developed and commercialised that are more environmentally benign is a question only time will answer but I'm sure people are looking.