Fig. 2From: Solution-Processed Cu(In, Ga)(S, Se)2 Nanocrystal as Inorganic Hole-Transporting Material for Efficient and Stable Perovskite Solar CellsSteady-state photoluminescence (PL) spectra for CH3NH3PbI3, CH3NH3PbI3/CIGSSe, and CH3NH3PbI3/ spiro-OMeTAD layers deposited on FTO/bl-TiO2/mp-TiO2 substratesBack to article page