Themed collection Perovskites

High throughput perovskite thin films made by evaporative physical vapour deposition gives unprecedented access to composition-properties relationships.

Localisation of charge carrying ligand holes in perovskite oxides containing high-valent iron leads to unusual structural, magnetic, and transport behavior.

Extended understandings of perovskite solar cells by recent ALD application studies as well as challenges toward enhancing the efficiency and stability will be addressed.

A structural rearrangement is observed in Ba₃MM′O_8.5 hexagonal perovskites above 300 °C, which enhances the oxide ionic conductivity.

Perovskite solar cells (PSCs) reached a certified 23.7% efficiency in 2018 by boosting their surprisingly high open-circuit voltage (V_OC) and photocurrent.

A new perovskite-type cuprate PrCuO₃ with unusual oxidation state and quasi-one-dimensional Cu–O chains has been synthesized by high-pressure oxygen annealing.

Polycrystalline Sr₂Fe_1+xRe_1−xO₆ samples have been synthesized, structurally characterized by X-ray powder diffraction, transmission electron microscopy, X-ray absorption spectroscopy, and measurements of their magnetotransport properties were performed.

The dicyanometallate superperovskite co-crystal [NBu₄]Mn[Au(CN)₂]₃·[NBu₄]ClO₄ illustrates a new type of structural and phase complexity accessible to dicyanometallate perovskites.

A simplified mechanochemical synthesis approach for Cs-containing mixed halide perovskite materials of lower and higher dimensionality (0D and 3D, respectively) is presented with stoichiometric control from their halide salts, CsX and PbX₂ (X = Cl, Br, I).

Perovskite oxides are promising materials as oxygen carriers in chemical looping applications.

We present a strategy for suppressing the open-circuit voltage (V_oc) loss of perovskite solar cells by incorporating large guanidinium cations (Gua⁺) into a perovskite lattice, leading to a significantly improved V_oc of 1.19 V and an impressive power conversion efficiency of >21%.

We modulated a solvent-mediated adduct for one-step crystallization of lead-free AgBi₂I₇ at a lower temperature (90 °C) and to obtain remnant BiI₃ by controlling the nature of the substrate and precursor concentration.

Unit cell volume collapse in Ba₂BiRuO₆, Ba₂BiIrO₆ and Ba₂BiOsO₆ when Bi(III) is oxidised to Bi(V) by external applied pressure.

Perovskite-type Nd_0.75Sr_0.25Co_0.8Fe_0.2O_3−δ (NSCF) has shown excellent oxygen reduction reaction properties (an area specific polarization resistance of 0.1 Ω cm² at 700 °C) as a composite cathode (30 wt% La_0.8Sr_0.2Ga_0.8Mg_0.2O_3−δ (LSGM)) with remarkable chemical stability under CO₂.

Lead-free double perovskite Cs₂AgSbBr₆ is synthesized to show a low indirect bandgap of 1.64 eV.

Crystal-to-crystal transformation from BaNiO₃ to BaNiO₂ is reported.

Small A-site cations (Mn²⁺) induce complex magnetic structures in this transition-metal-only double perovskite.

Exchanging the iodide for bromide on Cs₃Bi₂Br₉ redshifts the absorption band while maintaining the Cs₃Bi₂Br₉ structure.

The topotactic nitridation of cation ordered Sr₂FeMoO₆ in NH₃ leads to cubic, Fmm oxynitride Sr₂FeMoO_4.9N_1.1 showing ferromagnetic order and negative magnetoresistance below 100 K.

We report the high pressure synthesis of a layered perovskite Ca₂GeO₄ which is found to have the Ruddlesden–Popper structure with I4₁/acd symmetry, and to display pronounced uniaxial negative thermal expansion.

The connectivity of the ReO₃ structure is reproduced in a series of hypophosphite compounds, M(H₂PO₂)₃, where M = V, Al, Ga.

Preparation of 1D assemblies of lead halide-based nanoparticles inside a lead bromide polymer by concurrent formation of lead(II) oligomers and the nanoparticles in the presence of cyclohexanemethylammonium bromide.

A pinch of oxygen: incorporation of small additional oxygen introduces partly square planar coordination into BaCoO_2+δ.

A low-temperature carbon electrode with good perovskite compatibility is employed in hole-transport-material free perovskite solar cells, and a champion power conversion efficiency (PCE) of 11.7% is obtained.

This work explores the possibility of tuning the structural chemistry of A-site deficient perovskite materials Ln_1/3NbO₃, and the balance between proper and hybrid-improper mechanisms for polar behaviour in these systems.

Doubly ordered perovskites are reported for CaMnMReO₆ (M = Co, Ni). CaMnNiReO₆ is a remarkable example of a ferromagnetic oxide with four distinct spin sublattices all collinearly ordered below T_C = 152 K.

SrFeO₂F/SrRuO₃ epitaxial bilayer films were fabricated via a topotactic reaction with polyvinylidene difluoride while maintaining the epitaxial relationship.

High-efficiency planar type perovskite solar cells were fabricated by atomic layer deposition (ALD) of SnO₂ and subsequent annealing at 180 °C.

Multivariate data analysis is used in search of novel magnetically ordered perovskite oxides of the A₂B′B′′O₆ type.

Certain surprising aspects of iodide-ion conduction in MAPbI₃, such as the low migration barrier and the dominance of anti-Frenkel disorder, are discussed.

Magnetic interactions in double perovskites Ba₂CuTeO₆ and Ba₂CuWO₆ are characterized leading to a prediction of a spin-liquid-like state in Ba₂Cu(Te_1−xW_x)O₆.

Perovskite-derived hybrid platinum iodides with the general formula A₂Pt^IVI₆ (A = formamidinium FA and guanidinium GUA) accommodate excess I₂ to yield hydrogen-bond-stabilized compounds where the I₂ forms catenates with I⁻ anions on the PtI₆ octahedra.

In the present work, we show a successful approach to achieve stable structural and optical changes induced by pressure on bulk amounts of MAPI after pressure release.