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Title: Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [5];  [1];  [6];  [6];  [2];  [3];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Physics
  2. National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sceinces
  3. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Chemical Engineering
  4. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

Long carrier lifetime is what makes hybrid organic–inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation molecules can be a major contribution to the prolonged carrier lifetime. Our results reveal that the band-edge carrier lifetime increases when the system enters from a phase with lower rotational entropy to another phase with higher entropy. These results imply that the recombination of the photoexcited electrons and holes is suppressed by the screening, leading to the formation of polarons and thereby extending the lifetime. Furthermore, searching for organic–inorganic perovskites with high rotational entropy over a wide range of temperature may be a key to achieve superior solar cell performance.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016144; AC02-05CH11231
OSTI ID:
1498113
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 29; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Diagrammatic Monte Carlo Approach to Angular Momentum in Quantum Many-Particle Systems journal October 2018
Unraveling exciton-phonon coupling in individual FAPbI(3) nanocrystals emitting near-infrared single photons text January 2018
Kopplung von hoch- und niederfrequenten Schwingungsmoden in organisch-anorganischen Perowskiten journal September 2018
Hybrid light emitting diodes based on stable, high brightness all-inorganic CsPbI 3 perovskite nanocrystals and InGaN journal January 2019
First‐Principles Simulation of Carrier Recombination Mechanisms in Halide Perovskites journal April 2020
Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems text January 2018
Ferroelectric and Piezoelectric Effects on the Optical Process in Advanced Materials and Devices journal June 2018
Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons journal August 2018
Properties of Excitons and Photogenerated Charge Carriers in Metal Halide Perovskites journal September 2018
Communicating Two States in Perovskite Revealed by Time-Resolved Photoluminescence Spectroscopy journal November 2018
Halide-Perovskite Resonant Nanophotonics preprint January 2018
Structural fluctuations cause spin-split states in tetragonal (CH 3 NH 3 )PbI 3 as evidenced by the circular photogalvanic effect journal September 2018
Catalyst‐Free and Morphology‐Controlled Growth of 2D Perovskite Nanowires for Polarized Light Detection journal May 2019
Crystal structures and rotational dynamics of a two-dimensional metal halide perovskite (OA) 2 PbI 4 journal January 2020
Halide-Perovskite Resonant Nanophotonics journal August 2018
Vibrational Coupling between Organic and Inorganic Sublattices of Hybrid Perovskites journal September 2018
Rationalizing the Molecular Design of Hole‐Selective Contacts to Improve Charge Extraction in Perovskite Solar Cells journal June 2019
Communicating Two States in Perovskite Revealed by Time-Resolved Photoluminescence Spectroscopy preprint January 2018
Spintronics of Hybrid Organic–Inorganic Perovskites: Miraculous Basis of Integrated Optoelectronic Devices journal June 2019
Real-Time Observation of Order-Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites journal April 2018

Figures / Tables (6)


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