Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 32, Pages 8076-8081Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1809167115
Keywords
metastable states; perovskite; pressure; compression-decompression; bandgap
Categories
Funding
- NSAF [U1530402]
- US National Science Foundation [CBET-1150617, DMR-1806152]
- Consortium for Materials Properties Research in Earth Sciences under National Science Foundation Cooperative Agreement [EAR 1606856]
- Department of Energy (DOE)/National Nuclear Security Administration [DE-NA-0002006]
- DOE Office of Science [DE-SC0012704]
- US DOE, Office of Science [SC0012541]
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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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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