Planar perovskite solar cells with La2NiMnO6 buffer layer

Thin films of La2NiMnO6 (LNMO) double perovskite oxide were first used as buffer layers in planar perovskite solar cells (PSCs) with the architecture of glass/FTO/LNMO/CH3NH3PbI3/Spiro-MeOTAD/Au. All PSCs were fabricated under ambient conditions and their photovoltaic parameters were measured under standard illumination (AM1.5G, 1000 W/m2). Power conversion efficiency (PCE) values (10 - 11 %) for the PSCs developed were comparable with those obtained for conventional PSCs with compact TiO2 (cTiO2) layer, but the stability of PSCs with LNMO buffer layer was significantly higher than for cTiO2-based PSCs.