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首页> 外文期刊>Advanced Functional Materials >Low-Dimensional Single-Cation Formamidinium Lead Halide Perovskites (FA_(m+2)Pb_mBr_(3m+2)): From Synthesis to Rewritable Phase-Change Memory Film
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Low-Dimensional Single-Cation Formamidinium Lead Halide Perovskites (FA_(m+2)Pb_mBr_(3m+2)): From Synthesis to Rewritable Phase-Change Memory Film

机译：低维单阳离子甲脒铅卤化卤化物钙酸盐（FA_（M + 2）PB_MBR_（3M + 2））：从合成到可重写相变存储膜

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摘要

Synthesis of 2D perovskites often demands long and bulky organic spacer cations, but they hamper optoelectronic properties of the resulting 2D perovskites. Novel low-dimensional single-cation perovskites with a general formula of FA(m)(+2)Pb(m)Br(3)(m)(+2) are prepared by using a quenching-assisted solution process, which leads to the wide dimensional control over 1D FA(3)PbBr(5) (m = 1), 2D FA(m)(+2)Pb(m)Br(3)(m)(+2) (m = 2), and 3D FAPbX(3) (m = infinity) perovskites simply by changing the composition of precursors. In this case, formamidinium (FA) acts as both an A-site cation and spacer cation in FA(m)(+2)Pb(m)Br(3)(m)(+2). Unlike conventional 2D perovskites, FA(m)(+2)Pb(m)Br(3)(m)(+2) perovskites have (110) orientation. PVDF (poly(vinylidene fluoride)) preferentially stabilizes the low-dimensional FA(m)(+2)Pb(m)Br(3)(m)(+2) phases, which is utilized to fabricate the stable FA(m)(+2)Pb(m)Br(3)(m)(+2)-PVDF composite films. The phase transitions from 1D and 2D to 3D are investigated in response to various stimuli, including humidity, ultraviolet, oxygen, and solvents, are exploited for rewritable phase-change memory films.
机译：2D Perovskites的合成通常需要长而庞大的有机间隔阳离子，但它们妨碍了所得2D Perovskites的光电性质。通过使用猝灭辅助溶液方法制备具有FA（m）（+ 2）pb（m）（3）（3）（+ 2）的通式的新型低维单阳离子钙钛矿，其导致超过1D FA（3）PBBR（5）（M = 1），2D FA（M）（+ 2）PB（M）BR（3）（M）（+ 2）（m＆ = 2的宽尺寸控制通过改变前体的组成，通过改变前体的组成，3D FAPBX（3）（M = Infinity）蠕动。在这种情况下，甲脒（Fa）作为Fa（m）（+ 2）pb（m）br（3）（m）（+ 2）中的a现场阳离子和间隔阳离子。与常规的2D钙酸盐不同，Fa（m）（+ 2）pb（m）br（3）（3）（m）（+ 2）钙酸盐具有（110）取向。 PVDF（聚（偏二氟乙烯））优选稳定低维法（+ 2）Pb（+ 2）Br（3）（3）（+ 2）相，用于制造稳定的Fa（m） （+2）Pb（m）Br（3）（m）（m）（+ 2）-pvdf复合薄膜。响应于各种刺激，研究了来自1D和2D至3D的相转变，包括湿度，紫外，氧气和溶剂，用于可重写相变存储膜。

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