Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
In the field of perovskite solar cells, explorations of new lead-free all-inorganic perovskite materials are of great importance to solve the instability and toxicity issues of lead-based hybrid perovskites. Recently, copper-antimony-based double perovskite nanoparticles have been reported with ideal bandgap and good air stability, which possess great potential as absorbers for photovoltaic applications.[1-2] Here, for the first time, we demonstrate a facile and fast synthesis method for copper-antimony-based double perovskite nanocrystals (PNCs) by using a modified room-temperature ligand-assisted reprecipitation (RT-LARP) method[3] at ambient conditions. Comparing to commonly used solvents like dimethylformamide, less-toxic methanol is chosen as the solvent for precursor salts. We systematically study the effect of the types of anti-solvents and the amount of ligands on the size and morphology of the resulting PNCs. Interestingly, both layered Cs4CuSb2Cl12 double perovskites and cubic Cs2CuSbCl6 double perovskites can be achieved by changing the amount of precursor of the Cs source during the synthesis. Taking advantage of the solution processability, smooth and dense perovskite nanocrystal films are successfully fabricated. The photovoltaic performance of Cs2CuSbCl6 double perovskites (device structure: ITO/PEDOT:PSS/PNCs/bathocuproine/Ag) is reported with an initial power conversion efficiency of 0.13%.