Abstract：
Considerable focus on tin-based perovskites lies on substitution to leadhalide perovskites for the fabrication of eco-friendly optoelectronic devices.The major concern related to tin-based perovskite devices are mainly thestability and the efficiency. However, thinking on the final commercializationscope, other considerations such as precursor stability and cost are majorfactors to carry about. In this regard, this work presents a robust and facilesynthesis of 2D A2SnX4 (A = 4-fluorophenethylammonium(4-FPEA); X = I, Br, I/Br) and 3D FASnI3 perovskite microcrystals followinga developed synthesis strategy with low-cost starting materials. In thisdeveloped methodology, acetic acid is used as a solvent, which helps to protectfrom water by making a hydrophobic network over the perovskite surface, andhence provides sufficient ambient and long-term inert atmosphere stability ofthe microcrystals. Further, the microcrystals are recrystallized in thin filmsfor LED application, allowing the fabrication of orange, near-infrared and purered emitting LEDs. The two-step recrystallized devices show better performanceand stability in comparison to the reference devices made by using commercialprecursors. Importantly, the developed synthesis methodology is defined as ageneric method for the preparation of varieties of hybrid tin-based perovskitesmicrocrystals and application in optoelectronic devices.
摘要：
对锡基钙钛矿的相当大的关注在于取代卤化铅钙钛矿以制造环保的光电器件。锡基钙钛矿器件的主要关注点主要是稳定性和效率。然而,思考最终的商业化范围，前体稳定性和成本等其他考虑因素是需要考虑的主要因素。在这方面,这项工作提出了2DA2SnX4(A=4-氟苯乙基铵(4-FPEA)；X=I，Br,I/Br）和3DFASnI3钙钛矿微晶遵循开发的低成本原料合成策略。在这种发达的方法论中，乙酸用作溶剂，通过在钙钛矿表面形成疏水网络来保护免受水的影响，因此，为微晶提供了足够的环境和长期惰性气氛稳定性。Further,微晶在薄膜中重结晶，用于LED应用，允许制造橙色，近红外和纯发光LED。与使用市售前体制备的参考器件相比，两步重结晶器件显示出更好的性能和稳定性。重要的是,所开发的合成方法被定义为用于制备各种杂化锡基钙钛矿微晶和在光电器件中应用的ageneric方法。
