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Liu, Gang; Gong, Jue; Kong, Lingping; Schaller, Richard D.; Hu, Qingyang; Liu, Zhenxian; Yan, Shuai; Yang, Wenge; Stoumpos, Constantinos C.; Kanatzidis, Mercouri G.; Mao, Ho-kwang; Xu, Tao
Proceedings of the National Academy of Sciences, 08/2018, Letnik: 115, Številka: 32Journal Article
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.
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in: SICRIS
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