Investigating the Tetragonal‐to‐Orthorhombic Phase Transition of Methylammonium Lead Iodide Single Crystals by Detailed Photoluminescence Analysis

Here, the phase‐transition from tetragonal to orthorhombic crystal structure of the halide perovskite methylammonium lead iodide single crystal is investigated. Temperature dependent photoluminescence (PL) measurements in the temperature range between 165 and 100 K show complex PL spectra where in t...

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Bibliographic Details
Published in:Advanced optical materials 2020-09, Vol.8 (17), p.n/a
Main Authors: Schötz, Konstantin, Askar, Abdelrahman M., Köhler, Anna, Shankar, Karthik, Panzer, Fabian
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
halide perovskites
Inclusions
MAPbI3
Materials science
optical spectroscopy
Optics
Optoelectronics
Orthorhombic phase
Perovskites
Phase transitions
Photoluminescence
self‐absorption
Single crystals
Temperature dependence
Transition temperature
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Summary:Here, the phase‐transition from tetragonal to orthorhombic crystal structure of the halide perovskite methylammonium lead iodide single crystal is investigated. Temperature dependent photoluminescence (PL) measurements in the temperature range between 165 and 100 K show complex PL spectra where in total five different PL peaks can be identified. All observed PL features can be assigned to different optical effects from the two crystal phases using detailed PL analyses. This allows to quantify the fraction of tetragonal phase that still occurs below the phase transition temperature. It is found that at 150 K, 0.015% tetragonal phase remain, and PL signatures are observed from quantum confined tetragonal domains, suggesting their size to be about 7–15 nm down to 120 K. The tetragonal inclusions also exhibit an increased Urbach Energy, implying a high degree of structural disorder. The results first illustrate how a careful analysis of the PL can serve to deduce structural information, and second, how structural deviations in halide perovskites have a significant impact on the optoelectronic properties of this promising class of semiconductors. The structural transition from tetragonal to orthorhombic phase of a methylammonium lead iodide single crystal is investigated using detailed photoluminescence analysis and optical modelling. Structurally distorted tetragonal inclusions are found to exist at least until 45 K below the transition temperature, even in the case of single crystals.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202000455