Fig. 7From: Solution-Processed Cu(In, Ga)(S, Se)2 Nanocrystal as Inorganic Hole-Transporting Material for Efficient and Stable Perovskite Solar Cells a Water contact angles. b Normalized PCE of perovskite solar cells employing CIGSSe and spiro-OMeTAD as a function of storage time in airBack to article page