Isothermal pressure-derived metastable states in 2D hybrid perovskites showing enduring bandgap narrowing
Isothermal pressure-derived metastable states in 2D hybrid perovskites showing enduring bandgap narrowing
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DOI：
10.1073/pnas.1809167115
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发表时间：
2018-08-07
影响因子：
11.1
通讯作者：
Xu, Tao
中科院分区：
文献类型：
--
作者：
Liu, Gang;Gong, Jue;Xu, Tao
处于亚稳态的物质，如非晶态冰和过冷凝聚态物质，经常表现出奇异的现象。迄今为止，实现亚稳态通常是通过一个热力学路径函数，即加热-冷却循环，快速淬火来实现的。然而，热量对含有机物的材料是有害的，因为它会导致降解。另外，压力的应用可以用来达到通过加热-冷却循环无法达到的亚稳态。在这里，我们报道了二维有机-无机杂化钙钛矿通过压缩下的结构非晶化和减压后的再结晶达到亚稳态。值得注意的是，这种压力衍生的二维杂化钙钛矿亚稳态在环境条件下表现出长达8.2%的持久带隙缩小和稳定性。通过压缩-减压循环实现二维杂化钙钛矿的亚稳态，为操纵这些“软”材料的性质提供了另一种途径。
Materials in metastable states, such as amorphous ice and supercooled condensed matter, often exhibit exotic phenomena. To date, achieving metastability is usually accomplished by rapid quenching through a thermodynamic path function, namely, heating-cooling cycles. However, heat can be detrimental to organic-containing materials because it can induce degradation. Alternatively, the application of pressure can be used to achieve metastable states that are inaccessible via heating-cooling cycles. Here we report metastable states of 2D organic-inorganic hybrid perovskites reached through structural amorphization under compression followed by recrystallization via decompression. Remarkably, such pressure-derived metastable states in 2D hybrid perovskites exhibit enduring bandgap narrowing by as much as 8.2% with stability under ambient conditions. The achieved metastable states in 2D hybrid perovskites via compression-decompression cycles offer an alternative pathway toward manipulating the properties of these "soft" materials.