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Chemical Strain Engineering of MAPbI 3 Perovskite Films
Author(s) -
Yalcinkaya Yenal,
Hermes Ilka M.,
Seewald Tobias,
AmannWinkel Katrin,
Veith Lothar,
SchmidtMende Lukas,
Weber Stefan A.L.
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202202442
Subject(s) - materials science , perovskite (structure) , photoluminescence , crystallization , crystal (programming language) , halide , strain (injury) , crystal twinning , crystallography , iodide , diffraction , analytical chemistry (journal) , chemical engineering , inorganic chemistry , optics , chemistry , optoelectronics , microstructure , composite material , programming language , physics , chromatography , computer science , medicine , engineering
This study introduces a new chemical method for controlling the strain in methylammonium lead iodide (MAPbI 3 ) perovskite crystals by varying the ratio of Pb(Ac) 2 and PbCl 2 in the precursor solution. To observe the effect on crystal strain, a combination of piezoresponse force microscopy (PFM) and X‐ray diffraction (XRD) is used. The PFM images show an increase in the average size of ferroelastic twin domains upon increasing the PbCl 2 content, indicating an increase in crystal strain. The XRD spectra support this observation with strong crystal twinning features that appear in the spectra. This behavior is caused by a strain gradient during the crystallization due to different evaporation rates of methylammonium acetate and methylammonium chloride as revealed by time‐of‐flight secondary ion mass spectroscopy and grazing incidince X‐ray diffraction measurements. Additional time‐resolved photoluminescence shows an increased carrier lifetime in the MAPbI 3 films prepared with higher PbCl 2 content, suggesting a decreased trap density in films with larger twin domain structures. The results demonstrate the potential of chemical strain engineering as a simple method for controlling strain‐related effects in lead halide perovskites.