Metal‐halide perovskite materials have achieved tremendous progress in recent years due to their excellent optical and electrical properties. Moreover, their facile, low‐cost fabrication, and deposition processes seem to be a match extracted from a science fiction movie, promising a great future with applications beyond research laboratories premises. This is particularly true for solar energy harvesting devices, the metal halide perovskite solar cells (PSCs), which were considered in 2013 as one of the top ten scientific breakthroughs. PSCs certified power conversion efficiency (PCE) has progressed from 3.9% in 20091 to 22.7% in 2018 mainly as a result of the intense global research effort.