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Title: Effect of Cation Rotation on Charge Dynamics in Hybrid Lead Halide Perovskites

Journal Article · · Journal of Physical Chemistry. C

Organic-inorganic hybrid halide perovskites are a promising class of materials for photovoltaic application with reported power efficiencies over similar to 22%. However, not much is known about the influence of the organic dipole rotation and phase transitions on charge carrier dynamics. Here, we report substantial changes in mobility and lifetime of charge carriers in CH3NH3PbI3 after the low-temperature tetragonal (beta) to orthorhombic (gamma) phase transition. By using microwave conductivity measurements, we observed that the mobility and lifetime of ionized charge carriers increase as the temperature decreases and a sudden increment is seen after the beta-gamma phase transition. For CH3NH3PbI3, the mobility and the half-lifetime increase by a factor of 36 compared with the values before the beta-gamma phase transition. We attribute the considerable change in the dynamics at low temperature to the decrease of the inherent dynamic disorder of the organic cation (CH3NH3+) inside the perovskite crystal structure.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1330858
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 30; ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

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Cited By (16)

The effect of the magnitude and direction of the dipoles of organic cations on the electronic structure of hybrid halide perovskites journal January 2019
Quantifying Charge‐Carrier Mobilities and Recombination Rates in Metal Halide Perovskites from Time‐Resolved Microwave Photoconductivity Measurements journal February 2020
Direct–indirect character of the bandgap in methylammonium lead iodide perovskite journal October 2016
Excited-state vibrational dynamics toward the polaron in methylammonium lead iodide perovskite journal June 2018
Tin Halide Perovskites: Progress and Challenges journal April 2020
The Influence of Dipole Moments Induced by Organic Molecules and Domain Structures on the Properties of CH 3 NH 3 PbI 3 Perovskite journal April 2019
Mechanochemical Synthesis of Sn(II) and Sn(IV) Iodide Perovskites and Study of Their Structural, Chemical, Thermal, Optical, and Electrical Properties journal April 2020
Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH3NH3PbI3 journal June 2017
Recombination at high carrier density in methylammonium lead iodide studied using time-resolved microwave conductivity journal August 2017
Large polaron formation and its effect on electron transport in hybrid perovskites journal January 2019
Direct-indirect character of the bandgap in methylammonium lead iodide perovskite. text January 2017
Temperature Dependent Charge Carrier Dynamics in Formamidinium Lead Iodide Perovskite journal October 2017
Interconversion between Free Charges and Bound Excitons in 2D Hybrid Lead Halide Perovskites journal November 2017
The Relation between Rotational Dynamics of the Organic Cation and Phase Transitions in Hybrid Halide Perovskites journal May 2019
Vapour-Deposited Cesium Lead Iodide Perovskites: Microsecond Charge Carrier Lifetimes and Enhanced Photovoltaic Performance journal August 2017
Band-Like Charge Transport in Cs 2 AgBiBr 6 and Mixed Antimony–Bismuth Cs 2 AgBi 1– x Sb x Br 6 Halide Double Perovskites journal September 2018

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