Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr<sub>3</sub> Perovskite with Reduced Crystal Size

Δροσερός, Νικόλαος; Longo, Giulia; Brauer, Jan C.; Sessolo, Michele; Bolink, Henk J.; Banerji, Natalie

doi:10.1021/acsenergylett.8b00475

Cited by 120 publications

(148 citation statements)

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“…The microcavity quality factor was found to be around 92 and the measured Rabi splitting Ω Rabi was 70 meV. Firstly, our observation of the strong coupling regime is coherent with a dominant excitonic regime in CH 3 NH 3 PbBr 3 at room temperature, in good agreement with the most recent paper about this topic [49]. Secondly, this result is particularly important because it indicates that it is possible to obtain the strong coupling regime in solution-processed films of 3D perovskite.…”

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confidence: 91%

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

et al. 2019

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Hybrid halide perovskites are now considered as key materials for contemporary research in photovoltaics and nanophotonics. In particular, because these materials can be solution processed, they represent a great hope for obtaining low cost devices. While the potential of 2D layered hybrid perovskites for polaritonic devices operating at room temperature has been demonstrated in the past, the potential of the 3D perovskites has been much less explored for this particular application. Here, we report the strong exciton-photon coupling with 3D bromide hybrid perovskite. Cavity polaritons are experimentallly demonstrated from both reflectivity and photoluminescence experiments, at room temperature, in a 3λ/2 planar microcavity containing a large surface spin-coated CH 3 NH 3 PbBr 3 thin film. A microcavity quality factor of 92 was found and a large Rabi splitting of 70 meV was measured. This result paves the way to low-cost polaritonic devices operating at room temperature, potentially electrically injectable as 3D hybrid perovskites present good transport properties.Cavity polaritons are half-light half-matter quasiparticles arising from the strong coupling regime between excitonic and photonic modes [1]. Such regime is achieved when the coupling strength, related to the oscillator strength quantifying the light-matter interaction in a material, is larger than the dissipation rates of uncoupled excitons and cavity photons. Thanks to its hybrid nature, cavity polaritons inherit the best features of both the excitonic and photonic component: strongly nonlinear bosonic particles which can propagate balistically over macroscopic distance, and can be injected/probed via optical means. These fascinating properties suggest not only a playground for studying physics of out of equilibrium Bose Einstein condensation, but also a potential platform for all-optical devices. In the later direction, many proof-of-concepts of polaritonic devices have been reported: polaritonic lasers [2], polariton transistors [3], resonant tunnelling diodes [4], interferometer [5], optical gates [3], and optical router [6]. Most of these demonstrations are in GaAs-based system the most accomplished technologies to engineer cavity polaritons. However, due to the small excitonic effects and oscillator strength in GaAs, their operating regime is limited to cryogenic temperature. For this reason, materials presenting strong excitonic effects at room temperature, such as the high band gap materials GaN [7,8] or ZnO [9, 10] are actively studied. However, the achievement of inorganic semiconductor engineered confined microstructures need sophisticated and high * emmanuelle.deleporte@ens-cachan.fr temperature epitaxial techniques. Looking for low-cost solutions, soft chemistry and low temperature processed materials presenting strong excitonic effects were also considered. The strong coupling regime at room temperature has been demonstrated in planar microcavities containing organic materials [11][12][13][14] or organic-inorganic halide perovskites such ...

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confidence: 91%

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

et al. 2019

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“…The nanostructured MAPbBr 3 film showed a higher PL quantum yield (PLQY, 27%) than the pure MAPbBr 3 film (0.1%), as shown in Figure c. The improved PLQY is attributed to favored excitonic recombination by reducing crystal size together with reduced surface trapping resulting from efficient passivation by the additives …”

Section: Resultsmentioning

confidence: 99%

Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self‐Assembled Block Copolymer Films

Han

Jeong

Park

et al. 2019

Adv Funct Materials

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Ordered nanostructured crystals of thin organic-inorganic metal halide perovskites (OIHPs) are of great interest to researchers because of the dimensional-dependence of their photoelectronic properties for developing OIHPs with novel properties. Top-down routes such as nanoimprinting and electron beam lithography are extensively used for nanopatterning OIHPs, while bottom-up approaches are seldom used. Herein, developed is a simple and robust route, involving the controlled crystallization of the OIHPs templated with a self-assembled block copolymer (BCP), for fabricating nanopatterned OIHP films with various shapes and nanodomain sizes. When the precursor solution consisting of methylammonium lead halide (MAPbX 3 , X = Br − , I − ) perovskite and poly(styrene)-block-poly(2-vinylpyridine) (PS-b-P2VP) is spin-coated on the substrate, a nanostructured BCP is developed by microphase separation. Spontaneous crystallization of the precursor ions preferentially coordinated with the P2VP domains yields ordered nanocrystals with various nanostructures (cylinders, lamellae, and cylindrical mesh) with controlled domain size (≈40-72 nm). The nanopatterned OIHPs show significantly enhanced photoluminescence (PL) with high resistance to both humidity and heat due to geometrically confining OIHPs in and passivation with the P2VP chains. The self-assembled OIHP films with high PL performance provide a facile control of color coordinates by color conversion layers in blue-emitting devices for cool-white emission.

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“…As has been shown by Zheng et al, a significantly higher E b is found in MAPbBr 3 nanoparticles compared to bulk MAPbBr 3 , leading to the increased photoluminescence quantum yield (PLQY) seen in perovskite structures with reduced dimensionality . In a recent study by Droseros et al, the physical processes that govern the PL emission of polycrystalline MAPbBr 3 films and films containing smaller crystal sizes were explored . They also found enhanced PLQY for crystals with smaller size due to higher excitonic recombination and surface passivation.…”

Section: Photoluminescence Propertiesmentioning

confidence: 90%

“…Liu et al [33] Temperature-dependent PL Thin film with crystallites of 100s nm to a few µm size 25.9 meV Droseros et al [28] Excitation density-dependent integrated PL Polycrystalline thin film 110 meV…”

Section: Polycrystalline Thin Film 17 Mevmentioning

confidence: 99%

Photophysics of Methylammonium Lead Tribromide Perovskite: Free Carriers, Excitons, and Sub‐Bandgap States

Δροσερός

Τσόκκου

Banerji

2020

Advanced Energy Materials

Self Cite

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Methylammonium lead tribromide perovskite, one of the first artificially synthesized perovskites, can be used in multijunction solar cells and for light‐emitting applications. Its structure leads to a wide direct bandgap, a high extinction coefficient for absorption, and an exciton binding energy that is higher than the thermal energy at room temperature. The broad range of studies performed on the optical phenomena in this material has revealed the contribution of free carriers, excitons, and defect states to its photoluminescence properties. The present report aims to highlight the role played by the different primary photoexcitations, by defects and a variety of optical phenomena (dual emission, reabsorption, photon‐recycling, Rashba‐splitting) on the observed excited‐state properties of this semiconductor. Focus is given to the manifestation of these properties in different spectroscopic measurements.

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Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr₃ Perovskite with Reduced Crystal Size

Cited by 120 publications

References 76 publications

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self‐Assembled Block Copolymer Films

Photophysics of Methylammonium Lead Tribromide Perovskite: Free Carriers, Excitons, and Sub‐Bandgap States

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Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr3 Perovskite with Reduced Crystal Size

Cited by 120 publications

References 76 publications

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self‐Assembled Block Copolymer Films

Photophysics of Methylammonium Lead Tribromide Perovskite: Free Carriers, Excitons, and Sub‐Bandgap States

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Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr₃ Perovskite with Reduced Crystal Size