Enhancement of the performance of CsPbI3 all-inorganic perovskite solar cells based on organic ammonium salt surface modification
The surface modification of organic amine salt is an effective method to passivate the surface defects of perovskite and improve the stability of perovskite solar cells.The perovskite surface was modified by spin coating phenylethylammonium iodide(PEAI)and tetrabutylammonium iodide(TBAI)solution on the surface of CsPbI3 perovskite film and heat treatment.X-ray diffraction test,scanning electron microscope test and photoluminescence test were used to characterize the structural morphology and photoelectric properties of the films.The photoelectric properties of the battery devices were analyzed by current-voltage test,electrochemical impedance test and dark state current-voltage test,and the effects of two surface modifiers on the properties of CsPbI3 perovskite films and devices were compared.The results show that PEAI cannot exchange ions with CsPbI3 to generate low-dimensional perovskite,and can only adsorb on the surface to passivate the defects and prevent water vapor intrusion,so as to improve the stability of the film.TBAI can effectively enter the inorganic CsPbI3 perovskite lattice to form low-dimensional perovskite phase,and then improve the morphology,passivation defects and stability of the film.The photoelectric conversion efficiency of the TBAI-modified battery device is 8.5％higher than that of the PEAI-modified battery device,and the stability of the device is also enhanced.This study indicates the direction for developing new surface modifiers suitable for all-inorganic CsPbI3 perovskite.
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