MAPbl3-xClx perovskites show enormous potential in the aspect of high photoelectric conversion efficiency and great stability due to their superior optoelectronic. Herein, we conducted a comprehensive analysis of the FA+ ion's effects on the electrical properties and surface morphology of MA1-zFAzPbl3-xClx films, as well as the effect of the FA+ concentration on perovskite solar cell (PSC) properties. By adding an adequate quantity of FAI to the precursor, a series of PSCs were generated, the absorbed layer was comprised of mixed organic cation film (MA1-zFAzPbl3-xClx) to passivate interfacial defects and enhance stability. Work discovered that the moderate FA+ ions can increase grain size and inhibit the generation of defects by interionic interaction. Meanwhile, both the filling factor (FF) and the current density have been increased successfully, and the photoelectric conversion efficiency (PCE) of the champion device is 17.31%. The optimized PSC's device demonstrated excellent stability, with just a 3% decrease in efficiency after 150 hours of operation in a 25-30℃ and 30-40% humidity condition. This work manifests a great result of moderate FA+ ions as A-site cation replacement can significantly enhance the film-forming performance and device performance of MAPbCl3-xClx.

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All‐inorganic CsPbI3 perovskite is an ideal solar material with an appropriate bandgap (≈1.73 eV) that can be used for the top cell in tandem cells matched to crystalline silicon or low‐bandgap perovskites. Efficient all‐inorganic perovskite solar cells (PSCs) provide the cornerstone for efficient tandem cells. However, all‐inorganic PSCs are less efficient than organic–inorganic hybrids PSCs, and because CsPbI3 is incompatible with water, the stability of perovskite must be improved. Herein, a novel method for preparing efficient and stable PSCs via ionic chemical doping is proposed. Lithium fluoride as an inorganic ionic dopant can control grain growth and get larger grain sizes. The crystal structure, morphology, and electrochemical impedance spectroscopy of LiF‐doped all‐inorganic perovskite films are studied to determine the relationship between film quality and device performance. The doping of 2 mol% LiF considerably enhances the performance of the device, eliminates the hysteresis effect of the device, and the maximum power conversion efficiency of PSCs is raised to 17.02%. Additionally, device stability is greatly enhanced.

Inorganic lead halide perovskites have a reasonable energy bandgap, which makes them ideal for the tandem device. As a result, inorganic lead halide perovskites solar cells make the prospective next-generation solar materials, but the issue of instability under moisture remains unaddressed. Adding 4-fluoro-phenyl-ethylammonium iodide (F-PEAI) spacer cations to perovskites precursor solution is an elementary addition method to improve the performance of PSCs. we study the impact of F-PEAI on the perovskites crystal phase and the effect of F-PEAI concentration on PSCs performance. F-PEAI was used to passivate interfacial flaws and vacancies in inverted inorganic perovskites solar cells and improve moisture tolerance, resulting in a mixed 2D/3D heterostructure. A small number of F-PEAI-treated PSCs have changed interfacial characteristics, resulting in better charge extraction and less charge recombination. The devices based on CsPbI3-xBrx by F-PEAI treated exhibiting power conversion efficiency is much higher than the efficiency of pure CsPbI3-xBrx based solar cells, the PCE is increased to more than 11%. To attain high efficiency, all-inorganic perovskites can be modified using a straightforward method.