Perovskites have specific Achilles heel of oxygen degradation and hydroscopic degredation of the overall crystalline perovskite structure. As such manufacturing processes can introduce voids in the crystalline structure that also degrades light capture. Annealing processes to correct perturbations in the crystalline structure are tantamount to success. Perovskites can be ‘printed’ in thin layers and using different chemical combinations can tune multilayer films for a different band gap of the light spectrum. For instance a Pentiary cell with two Perovskite layers over silicon crystalline cells and two different Perovskite layers behind the silicon crystalline cell could capture front light and back scatter light as a superior bifacial solar PV panel. Long term thermal stresses, LeTID induced crystalline lattice disturbances could allow such an initial superior light capture cell to become the equivalent of an encapsulated silicon cell in an opaque envelope akin to one’s eyes with cataracts. SO, take away, a well known crystalline silicon cell of 22% initial efficiency manufactured today might well have a useful life of 30 + years with a total loss of 2.5% to perhaps 7% efficiency, based on accelerated cell testing performed to generate the typical performance data in panel specification sheets. Perovskite encapsulated silicon cells might degrade in steps over years of use and become much less effective than pure annealed crystalline silicone cells used today. There’s still a LOT of R&D to go for a multilayered solar PV cell that will last 30+ years and still provide broad spectrum light capture and power yields for decades. Just sayin’.