Effect of Surfactants on Preparation of Perovskite Films

With the continuous development of perovskite solar cells, the preparation methods of thin film become diverse. Battery performance is further improved, and the efficiency is rapidly improved. The preparation of thin film also tends to be high-efficiency and large-area, including the spin coating, vacuum evaporation, inkjet printing and so on, which provides great help for the industrial application of perovskite batteries. For the preparation of perovskite film, there are still some problems that need to be solved urgently, such as the matching problem of ink and the hydrodynamic problem of ink. In this paper, the rheological properties (surface tension, viscosity, contact angle) of the ink were tested by adding different types and concentrations of surfactants into the configured perovskite ink, and the thin films were prepared by one-step spin coating method. The changes in the morphology of the thin films were explored, and the appropriate surfactants were selected, and the molar ratio of the addition was determined, so that the film has good morphology.