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Hexylammonium Iodide Derived Two-Dimensional Perovskite as Interfacial Passivation Layer in Efficient Two-Dimensional/Three-Dimensional Perovskite Solar Cells
摘要： Defects locating within grain boundaries or on the film surface, especially organic cation vacancies and iodine vacancies make the fabrication of perovskite solar cells (PSCs) with superior performance a challenge. Organic ammonium iodide is a promising candidate and has been frequently used to passivate these defects by forming two-dimensional (2D) perovskite. In this work, it is found that the chain length of organic ammonium iodide is a crucial factor on the defect passivation effect. Compared to butylammonium iodide (BAI), hexylammonium iodide (HAI) derived 2D perovskite is more efficient in decreasing interfacial defects, resulting in a notably enhanced photoluminescence lifetime and a more suppressed interfacial charge recombination process. As a consequence, the ultimate power conversion efficiency (PCE) has reached 20.62% (3D+HAI) as compared to 18.83% (3D). Moreover, the long-term durability of the corresponding PSCs against humidity and heat is simultaneously improved. This work once again demonstrates that 2D/3D structure is promising for further improving the PCE and stability of PSCs.
关键词： perovskite solar cell,organic ammonium iodide,stability,interfacial passivation,2D/3D stacking structure
更新于2025-09-12 10:27:22
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Interfacial Passivation for Perovskite Solar Cells: The Effects of Functional Group in Phenethylammonium Iodide
摘要： Defect passivation is an effective method to improve the performance of perovskite solar cells. In this study, four phenethylammonium iodide featured with different functional groups directly linking to benzene ring are introduced on the surface of perovskite films ((FAPbI3)1-x(MAPbBr3-yCly)x) to investigate their passivation effects. It’s found that the electron density of the benzene ring has significant influence on the interfacial passivation: phenethylammonium iodide with electron-donating groups (methoxyl and methyl) present favorable passivation effects, while the salt with electron-drawing group (nitro) delivers undesirable impacts. The passivation is attributed to the electrostatic interaction between the benzene ring and the undercoordinated Pb2+ ions. The salts treated films are employed to fabricate solar cells, and an efficiency of 22.98% is achieved. In addition, the treated device shows good long-term stability within 1000 h storage in the dark ambient environment.
关键词： interfacial passivation,perovskite solar cells,phenethylammonium iodide,electron density,functional groups
更新于2025-09-12 10:27:22