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Title: Microstructure of Methylammonium Lead iodide Perovskite Thin Films: A Comprehensive Study of the Strain and Texture

Abstract

Controlling the microstructure of hybrid halide perovskite thin films is essential for optimizing their performance in optoelectronic devices. It is well established that the strain state of the perovskite layer affects its stability. Likewise, the orientation of the perovskite lattice is a determining parameter as these materials have shown pronounced anisotropies in their physical and mechanical properties. In this work, the authors focus on the understanding of the mechanisms that govern the strain and texture observed in MAPbI3 thin films deposited on various oxide substrates. A thorough study of the evolution of the strain of the perovskite layer upon cooling down to room temperature from the crystallization temperature (100 °C) shows an essentially relaxed behavior of the perovskite layers. This result contradicts the commonly accepted hypothesis according to which MAPbI3 layers synthesized above ambient temperature are strained due to the large mismatch in the thermal expansion coefficients of the perovskite and its substrate. The texture in MAPbI3 layers is investigated by means of synchrotron full-field diffraction X-ray microscopy. This technique allows the direct observation of the [hh0] and [00l]-oriented domains at the origin of the observed textures, demonstrating both their twin and ferroelastic nature. The stability of the different domainmore » orientations is investigated by DFT calculations, illustrating the determining role of the chemical environment at the film-substrate interface. PbI2- terminated surfaces are found to favor the [hh0] orientations while for MAI-terminated ones, both [hh0] and [00l] domains are equally stabilized. The different results constitute an important step of clarification and understanding from the perspective of controlling the microstructure of perovskite layers.« less

Authors:
 [1];  [2];  [3];  [4];  [1];  [5];  [1];  [1]; ORCiD logo [1]
  1. Univ. of Grenoble Alpes, Grenoble (France)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Universidad de Antioquia UdeA, Medellin (Colombia); Univ. of Grenoble Alpes, Grenoble (France)
  4. Univ. of Versailles Saint-Quentin-en-Yvelines (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); French Research Agency (ANR)
OSTI Identifier:
1897206
Grant/Contract Number:  
AC02-06CH11357; ANR-15-CE05-0023-01; PERSIL ANR-16-CE05-0019-02; ANR-10-LABX-51-01
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 19; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; halide perovskites; microstructure; strain; synchrotron; texture; thin layers; X-ray diffraction

Citation Formats

Medjahed, Asma A., Zhou, Tao, Alvarez Quiceno, Juan Camilo, Dally, Pia, Pochet, Pascal, Schülli, Tobias U., Djurado, David, Reiss, Peter, and Pouget, Stéphanie. Microstructure of Methylammonium Lead iodide Perovskite Thin Films: A Comprehensive Study of the Strain and Texture. United States: N. p., 2022. Web. doi:10.1002/aenm.202103627.
Medjahed, Asma A., Zhou, Tao, Alvarez Quiceno, Juan Camilo, Dally, Pia, Pochet, Pascal, Schülli, Tobias U., Djurado, David, Reiss, Peter, & Pouget, Stéphanie. Microstructure of Methylammonium Lead iodide Perovskite Thin Films: A Comprehensive Study of the Strain and Texture. United States. https://doi.org/10.1002/aenm.202103627
Medjahed, Asma A., Zhou, Tao, Alvarez Quiceno, Juan Camilo, Dally, Pia, Pochet, Pascal, Schülli, Tobias U., Djurado, David, Reiss, Peter, and Pouget, Stéphanie. Sat . "Microstructure of Methylammonium Lead iodide Perovskite Thin Films: A Comprehensive Study of the Strain and Texture". United States. https://doi.org/10.1002/aenm.202103627. https://www.osti.gov/servlets/purl/1897206.
@article{osti_1897206,
title = {Microstructure of Methylammonium Lead iodide Perovskite Thin Films: A Comprehensive Study of the Strain and Texture},
author = {Medjahed, Asma A. and Zhou, Tao and Alvarez Quiceno, Juan Camilo and Dally, Pia and Pochet, Pascal and Schülli, Tobias U. and Djurado, David and Reiss, Peter and Pouget, Stéphanie},
abstractNote = {Controlling the microstructure of hybrid halide perovskite thin films is essential for optimizing their performance in optoelectronic devices. It is well established that the strain state of the perovskite layer affects its stability. Likewise, the orientation of the perovskite lattice is a determining parameter as these materials have shown pronounced anisotropies in their physical and mechanical properties. In this work, the authors focus on the understanding of the mechanisms that govern the strain and texture observed in MAPbI3 thin films deposited on various oxide substrates. A thorough study of the evolution of the strain of the perovskite layer upon cooling down to room temperature from the crystallization temperature (100 °C) shows an essentially relaxed behavior of the perovskite layers. This result contradicts the commonly accepted hypothesis according to which MAPbI3 layers synthesized above ambient temperature are strained due to the large mismatch in the thermal expansion coefficients of the perovskite and its substrate. The texture in MAPbI3 layers is investigated by means of synchrotron full-field diffraction X-ray microscopy. This technique allows the direct observation of the [hh0] and [00l]-oriented domains at the origin of the observed textures, demonstrating both their twin and ferroelastic nature. The stability of the different domain orientations is investigated by DFT calculations, illustrating the determining role of the chemical environment at the film-substrate interface. PbI2- terminated surfaces are found to favor the [hh0] orientations while for MAI-terminated ones, both [hh0] and [00l] domains are equally stabilized. The different results constitute an important step of clarification and understanding from the perspective of controlling the microstructure of perovskite layers.},
doi = {10.1002/aenm.202103627},
journal = {Advanced Energy Materials},
number = 19,
volume = 12,
place = {United States},
year = {Sat Feb 26 00:00:00 EST 2022},
month = {Sat Feb 26 00:00:00 EST 2022}
}

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