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Title: Pressure-Induced Polymorphic, Optical, and Electronic Transitions of Formamidinium Lead Iodide Perovskite

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1];  [2];  [3];  [1];  [1];  [4];  [4];  [4];  [4]; ORCiD logo [1]
  1. Univ. of Western Ontario, London, ON (Canada)
  2. Univ. of Saskatchewan, Saskatoon, SK (Canada)
  3. Univ. of Saskatchewan, Saskatoon, SK (Canada); Canadian Light Source Inc., Saskatoon, SK (Canada)
  4. Chinese Academy of Sciences (CAS), Beijing (China)

Formamidinium lead iodide (FAPbI3) perovskite as a superior solar cell material was investigated in two polymorphs at high pressures using in situ synchrotron X-ray diffraction, FTIR spectroscopy, photoluminescence (PL) spectroscopy, electrical conductivity (EC) measurements, and ab initio calculations. We identified two new structures (i.e., Imm2 and Immm) for α-FAPbI3 but only a structural distortion (in C2/c) for δ-FAPbI3 upon compression. A pressure-enhanced hydrogen bond plays a prominent role in structural modifications, as corroborated by FTIR spectroscopy. PL measurements and calculations consistently show the structure and pressure dependences of the band gap energies. Lastly, EC measurements reveal drastically different transport properties of α- and δ-FAPbI3 at low pressures but a common trend to metallic states at high pressures. All of these observations suggest strongly contrasting structural stabilities and pressure-tuned optoelectric properties of the two FAPbI3 polymorphs.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Canadian Foundation for Innovation
OSTI ID:
1417380
Journal Information:
Journal of Physical Chemistry Letters, Vol. 8, Issue 10; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Emission enhancement and bandgap retention of a two-dimensional mixed cation lead halide perovskite under high pressure journal January 2019
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Pressure responses of halide perovskites with various compositions, dimensionalities, and morphologies journal January 2020
New Metallic Ordered Phase of Perovskite CsPbI 3 under Pressure journal May 2019
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Pressure-Induced Emission Enhancement, Band-Gap Narrowing, and Metallization of Halide Perovskite Cs 3 Bi 2 I 9 journal July 2018
Pressure-induced effects in the inorganic halide perovskite CsGeI 3 journal January 2019
Direct Laser Writing of δ- to α-Phase Transformation in Formamidinium Lead Iodide journal August 2017
Pressure-induced dramatic changes in organic–inorganic halide perovskites journal January 2017
Recent Advances in Energetics and Stability of Metal Halide Perovskites for Optoelectronic Applications journal December 2018
Pressure-Induced Emission Enhancement, Band-Gap Narrowing, and Metallization of Halide Perovskite Cs 3 Bi 2 I 9 journal July 2018
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