Single-junction and multi-junction (tandem) perovskite solar cells represent in today’s photovoltaic (PV) field one of the most investigated technologies. The promising results reached during the past two decades led to efficiencies up to 26.1 % for single-junction and up to 33.7 % for perovskite/silicon tandem solar cells, higher than the widely diffused single-junction silicon solar cells. Nevertheless, the market share of PV is still dominated by the well-established silicon technology since organic-inorganic perovskites are sensitive to atmospheric environmental conditions such as exposure to moisture. The lab-scale perovskite processing methods typically employed are challenging to scale up and not environmentally friendly due, among other reasons, to the high amount of harmful solutions they exploit.