Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 8076-8081 |
| Number of pages | 6 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Volume | 115 |
| Issue number | 32 |
| DOIs | |
| State | Published - Aug 7 2018 |
Funding
ACKNOWLEDGMENTS. We thank the staff from BL01B beamline of National Center for Protein Science Shanghai at Shanghai Synchrotron Radiation Facility for assistance during data collection. G.L., L.K., and H.-k.M. acknowledge support from the NSAF (U1530402). T.X. acknowledges the financial support from the US National Science Foundation (CBET-1150617 and DMR-1806152). High-pressure powder structure characterizations were performed at beamline 15U at SSRF. Optical measurements were made at the Infrared Laboratory at NSLS-II. The Infrared Laboratory is supported by the Consortium for Materials Properties Research in Earth Sciences under National Science Foundation Cooperative Agreement EAR 1606856 and the Department of Energy (DOE)/National Nuclear Security Administration under Grant DE-NA-0002006. NSLS-II is supported by the DOE Office of Science under Contract DE-SC0012704. Work at Northwestern University was supported by Grant SC0012541 from the US DOE, Office of Science (sample synthesis, processing, and structural characterization). Use of CNM, an Office of Science user facility, was supported by the US DOE, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. The computational work was conducted on the SR10000-K1/52 supercomputing facilities of the Institute for Materials Research, Tohoku University. We thank the staff from BL01B beamline of National Center for Protein Science Shanghai at Shanghai Synchrotron Radiation Facility for assistance during data collection. G.L., L.K., and H.-k.M. acknowledge support from the NSAF (U1530402). T.X. acknowledges the financial support from the US National Science Foundation (CBET-1150617 and DMR-1806152). High-pressure powder structure characterizations were performed at beamline 15U at SSRF. Optical measurements were made at the Infrared Laboratory at NSLS-II. The Infrared Laboratory is supported by the Consortium for Materials Properties Research in Earth Sciences under National Science Foundation Cooperative Agreement EAR 1606856 and the Department of Energy (DOE)/National Nuclear Security Administration under Grant DENA-0002006. NSLS-II is supported by the DOE Office of Science under Contract DE-SC0012704. Work at Northwestern University was supported by Grant SC0012541 from the US DOE, Office of Science (sample synthesis, processing, and structural characterization). Use of CNM, an Office of Science user facility, was supported by the US DOE, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. The computational work was conducted on the SR10000-K1/52 supercomputing facilities of the Institute for Materials Research, Tohoku University.
Keywords
- Bandgap
- Compression−decompression
- Metastable states
- Perovskite
- Pressure
ASJC Scopus subject areas
- General