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Title: Two Regimes of Bandgap Red Shift and Partial Ambient Retention in Pressure-Treated Two-Dimensional Perovskites

Journal Article · · ACS Energy Letters
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [6];  [2];  [1]; ORCiD logo [3]; ORCiD logo [7]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
  2. Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
  3. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
  4. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
  5. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
  6. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
  7. Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States; Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States

The discovery of elevated environmental stability in two-dimensional (2D) Ruddlesden–Popper hybrid perovskites represents a significant advance in low-cost, high-efficiency light absorbers. In comparison to 3D counterparts, 2D perovskites of organo-lead-halides exhibit wider, quantum-confined optical bandgaps that reduce the wavelength range of light absorption. Here, we characterize the structural and optical properties of 2D hybrid perovskites as a function of hydrostatic pressure. We observe bandgap narrowing with pressure of 633 meV that is partially retained following pressure release due to an atomic reconfiguration mechanism. We identify two distinct regimes of compression dominated by the softer organic and less compressible inorganic sublattices. Our findings, which also include PL enhancement, correlate well with density functional theory calculations and establish structure–property relationships at the atomic scale. These concepts can be expanded into other hybrid perovskites and suggest that pressure/strain processing could offer a new route to improved materials-by-design in applications.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0012704
OSTI ID:
1409634
Report Number(s):
BNL-114686-2017-JA¿¿¿
Journal Information:
ACS Energy Letters, Vol. 2, Issue 11; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

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Metal halide perovskites under compression journal January 2019
Isothermal pressure-derived metastable states in 2D hybrid perovskites showing enduring bandgap narrowing journal July 2018
Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C 4 H 9 NH 3 ) 2 PbI 4 under High Pressure journal June 2019
Pressure-induced semiconductor-to-metal phase transition of a charge-ordered indium halide perovskite journal November 2019
Pressure responses of halide perovskites with various compositions, dimensionalities, and morphologies journal January 2020
Manipulating efficient light emission in two-dimensional perovskite crystals by pressure-induced anisotropic deformation journal July 2019
Pressure‐Induced Emission (PIE) and Phase Transition of a Two‐dimensional Halide Double Perovskite (BA) 4 AgBiBr 8 (BA=CH 3 (CH 2 ) 3 NH 3 + ) journal October 2019
Pressure-induced effects in the inorganic halide perovskite CsGeI 3 journal January 2019
Emission enhancement and bandgap retention of a two-dimensional mixed cation lead halide perovskite under high pressure journal January 2019
Searching for stability at lower dimensions: current trends and future prospects of layered perovskite solar cells journal January 2019
Substrate‐Dependent Spin–Orbit Coupling in Hybrid Perovskite Thin Films journal July 2019