Inhibition of light emission from the metastable tetragonal phase at low temperatures in island-like films of lead iodide perovskites
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Other documents of the author: Chuliá-Jordán, Raquel; Fernández Delgado, Natalia; Juarez-Perez, Emilio Jose; Mora-Sero, Ivan; Herrera Collado, Miriam; Molina, Sergio I.; Martínez-Pastor, Juan P.
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https://doi.org/10.1039/C9NR07543G |
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Title
Inhibition of light emission from the metastable tetragonal phase at low temperatures in island-like films of lead iodide perovskitesAuthor (s)
Date
2019Publisher
Royal Society of ChemistryISSN
2040-3364; 2040-3372Bibliographic citation
CHULIÁ-JORDÁN, Raquel, et al. Inhibition of light emission from the metastable tetragonal phase at low temperatures in island-like films of lead iodide perovskites. Nanoscale, 2019, vol. 11, no 46, p. 22378-22386.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionAbstract
Photonic applications based on halide perovskites, namely CH3NH3PbI3 (MAPbI3), have recently attracted
remarkable attention due to the high efficiencies reported for photovoltaic and light emitting devices.
Despite ... [+]
Photonic applications based on halide perovskites, namely CH3NH3PbI3 (MAPbI3), have recently attracted
remarkable attention due to the high efficiencies reported for photovoltaic and light emitting devices.
Despite these outstanding results, there are many temperature-, laser excitation power-, and morphology-dependent phenomena that require further research to be completely understood. In this work, we
have investigated in detail the nature of exciton optical transitions and recombination dynamics below
and above the orthorhombic/tetragonal (‘O’-/‘T’-) temperature phase transition (∼150 K) depending on
the material continuity (continuous-like) or discontinuity (island-like) in MAPbI3 films. At low temperatures,
continuous thin films of the perovskite can exhibit strain inhomogeneities associated with the formation
of different ‘T’-defective domains leading to an energy spread of states over more than 200 meV. On the
other hand, a single photoluminescence line peak related to the perovskite ‘O’-phase (associated with the
distortion of the [PbI3]
− anion) is observed in the island-like sample that we attribute to strain relaxation
for this morphology. Moreover, the predominantly radiative recombination dynamics of the continuouslike sample mainly originates from nongeminate electron–hole formation of excitons in the ‘O’-phase
and the internal dynamics with carrier trapping levels. This observation is in strong contrast to the free
exciton recombination dominantly found in the island-like sample. [-]
Is part of
Nanoscale, 2019, 11.Investigation project
European Union (EU) 704998, MINECO TEC2017-86102-C2-1-R/2-R, Prometeo/2018/098, Junta de Andalucia TEP-946Rights
This journal is © The Royal Society of Chemistry 2019
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