Pedestrian Guide to Symmetry Properties of the Reference Cubic Structure of 3D All-Inorganic and Hybrid Perovskites

Even, Jacky

doi:10.1021/acs.jpclett.5b00905

Cited by 62 publications

(115 citation statements)

References 31 publications

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“…9,10 Moreover, this family of compounds can be found in many different crystal structures. To conduct our survey we decided to start from the highly symmetrical Pm3m (n 221) reference phase, 52 observed in the high temperature phase of numerous hybrid perovskites. [54][55][56][57] From this point we follow different phase transitions ( Figure 2).…”

Section: Dresselhaus Spin Splittingsmentioning

confidence: 99%

Rashba and Dresselhaus Effects in Hybrid Organic–Inorganic Perovskites: From Basics to Devices

et al. 2015

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We use symmetry analysis, density functional theory calculations and k · p modeling to scrutinize Rashba and Dresselhaus effects in hybrid organic-inorganic halide perovskites. These perovskites are at the center of a recent revolution in the field of photovoltaics but have also demonstrated potential for optoelectronic applications such as transistors and light emitters.Due to a large spin-orbit coupling of the most frequently used metals, they are also predicted to offer a promising avenue for spin-based applications. With an in-depth inspection of the electronic structures and bulk lattice symmetries of a variety of systems, we analyse the origin of the spin splitting in two-and three-dimensional hybrid perovskites. It is shown that low-dimensional nanostructures made of CH 3 NH 3 PbX 3 (X=I, Br) lead to spin splittings that can be controlled by an applied electric field. This new findings further open the door for a perovskite-based spintronics.

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Section: Dresselhaus Spin Splittingsmentioning

confidence: 99%

Rashba and Dresselhaus Effects in Hybrid Organic–Inorganic Perovskites: From Basics to Devices

et al. 2015

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“…A detailed analysis of the perovskites symmetry can be found in the literature. [33][34][35] Most of the basic properties of inorganic halide perovskites may be understood from an analysis of the cubic phase. In this phase crystals have the point group O h coinciding with the group of the wave vector at the R point of the Brillouin zone, where the band extrema are located.…”

Section: Bandstructure Of Inorganic Halide Perovskitesmentioning

confidence: 99%

Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystals

et al. 2018

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We demonstrate the optical orientation and alignment of excitons in a two-dimensional layer of CsPbI3 perovskite nanocrystals prepared by colloidal synthesis and measure the anisotropic exchange splitting of exciton levels in the nanocrystals. From the experimental data at low temperature (2 K), we obtain the average value of anisotropic splitting of bright exciton states of the order of 120 µeV. Our calculations demonstrate that there is a significant contribution to the splitting due to the nanocrystal shape anisotropy for all inorganic perovskite nanocrystrals.

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“…In inorganic bulk perovskites, all phase transitions occur well above room temperature [50,51]. An elaborate review of the perovskites symmetry can be found in the literature [52,53]. However, a detailed knowledge of the point-group symmetry and an appropriate irreductible representations become crucial to describe the band-edge excitons of highly anisotropic perovskite NCs.…”

Section: Introductionmentioning

confidence: 99%

Bright-Exciton Splittings in Inorganic Cesium Lead Halide Perovskite Nanocrystals

et al. 2019

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et al.. Bright-exciton splittings in inorganic cesium lead halide perovskite nanocrystals. AbstractSince their …rst synthesis in 2015, the all-inorganic lead halide perovskite nanocrystals CsPbX 3 (X = Cl, Br, I) have attracted a great attention due to their outstanding electronic and optical properties as well as their performances which outclass the ones of II-VI conterparts in many application …elds. In addition to these properties, the understanding of the emission features in these systems at the single object scale is crucial e.g. for nanophotonics and quantum optics devices. The details of the band-edge excitonic emission are here theoretically explored. The contribution of the long-range exchange interaction to the bright-exciton splittings is computed in strong and weak con…nement regimes by using the group theory and k.p arguments. We show that the shape anisotropy of a nanocrystal can also be at play with the crystalline (cubic, tetragonal or orthorhombic) structures to explain the emission properties. In the weak con…nement regime, splittings are inversely proportional to the cube of the exciton Bohr radius and we observe an increase of the splittings from iodide, to bromide, then chloride perovskite compounds. However, in the strong con…nement regime, splittings increase inversely proportional to the nanocrystal volume and, for a given nanocrystal size, the splitting values are comparable for the three halide perovskite materials. The present theoretical developments lead to quantitative contributions in good agreement with available experimental data mainly in the weak con…nement regime.

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Pedestrian Guide to Symmetry Properties of the Reference Cubic Structure of 3D All-Inorganic and Hybrid Perovskites

Abstract: International audienc

Cited by 62 publications

References 31 publications

Rashba and Dresselhaus Effects in Hybrid Organic–Inorganic Perovskites: From Basics to Devices

Rashba and Dresselhaus Effects in Hybrid Organic–Inorganic Perovskites: From Basics to Devices

Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystals

Bright-Exciton Splittings in Inorganic Cesium Lead Halide Perovskite Nanocrystals

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