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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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.

All-inorganic CsPbI3-xBrx perovskites with appropriate band gap is an attractive semiconductor material for solar applications, whereas their phase stability plays a key role in high-efficiency perovskite solar cells (PSCs). Their device performance was severely constrained by defects, here we found that the promising phenylpropylamine bromide (PPABr) as a simple additive can effectively influence the crystallization kinetics and produce a bifunctional treatment of perovskite, Br ion doping, and organic cation surface passivation. The PPABr treatment has essentially little influence on the light absorption capacity of CsPbI3-xBrx, the band gap is somewhat widened, and the surface hydrophobicity and phase stability are enhanced. CsPbI3-xBrx perovskites treated with PPABr have altered interfacial properties and obtained better interfacial contact, resulting in improved charge extraction and decreased charge recombination. Furthermore, 2.5mol% PPABr treated CsPbI3-xBrx-based perovskite solar cells exhibited repeatable photovoltaic performance with a maximum efficiency of 13.14%. Within 150 hours under air circumstances, the PCE attenuation is controlled to within 5% during the test. Hence, passivating inorganic perovskite using organic bromides PPABr is a novel and promising strategy for developing stable, high-performance solar cells.