Nanopowders of La 2 Ni 0.8 Fe 0.2 MnO 6 and La 2 NiMnO 6 double perovskite oxides were synthesized by glycine-nitrate combustion method. The obtained materials were characterized using X-ray diffraction, scanning electron microscopy and optical measurements. Thin nanostructured layers based on the prepared materials were used as light absorbing layers for fabrication of inorganic perovskite solar cells (PSCs). Electron transport layers for the PSCs were prepared using TiO 2 and ZrO 2 nanostructured layers. The best performance of 3.7 % under AM1.5G illumination was obtained for the PSC structure glass/FTO
Nanocrystalline particles on the basis of La 2 (Ni,Mn,Fe) 2 O 6 variable composition phases of a double perovskite structure have been produced by glycine-nitrate combustion. The size of crystallites grows from 5 to 45 nm with an increase in iron content of synthesized particles. It is demonstrated that iron unevenly builds into octahedral sites of nickel and manganese ions substituting mainly manganese ions. At the same time, the dependence of double perovskite unit cell volume on the iron ions concentration is well described by Retgers' law. KEYWORDS double perovskite, nanocrystals, solution combustion, photovoltaics. ACKNOWLEDGEMENTS The authors express their gratitude to V. V. Gusarov for the attention he paid to the work. X-ray diffraction and SEM was performed using the equipment of the Engineering Center of Saint Petersburg State Institute of Technology. This study was financially supported by the Russian Science Foundation (project no. 20-63-47016). FOR CITATION Averkiev D.D., Larina L.L., Shevaleevskiy O.I., Almjasheva O.V. Formation of nanocrystalline particles on the basis of La 2 (Ni,Mn,Fe) 2 O 6 variable composition phases having a structure of double perovskite under conditions of solution combustion.
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