Fig. 10

Impact of interface defects (10¹⁰ cm^− 2 to 10¹⁸ cm^− 2) on the performance of the top subcell (a) IV curve and (b) PV parameters for N-PDI/CsPb_0.75 Sn_0.25IBr₂ (ETL/absorber layer) interface (c) IV curve and (d) PV parameters for CsPb_0.75 Sn_0.25IBr₂/Spiro-OMeTAD (absorber layer/HTL) interface.