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A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Solid-State Chemistry".

Deadline for manuscript submissions: closed (31 May 2026) | Viewed by 23322

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Dr. Pengfei Wu

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Chemistry Department, Emory University, Atlanta, GA, USA
Interests: perovskite; battery; polymer

Special Issue Information

Dear Colleagues,

Perovskite materials have emerged as one of the most versatile and promising materials in the fields of inorganic chemistry, materials science, and optoelectronics. Their unique structural flexibility, tunable electronic properties, and exceptional performance in applications such as photovoltaics, light-emitting diodes, catalysis, and energy storage have made them the focus of extensive research efforts. Recent advancements in perovskite synthesis, stability enhancement, and functionalization have further expanded their potential across multiple disciplines.

We are pleased to invite you to contribute to this Special Issue, “Recent Progress in Perovskites”, which aims to bring together the latest advancements and insights into perovskite materials. This issue will provide a platform for researchers to share innovative approaches, fundamental studies, and cutting-edge applications related to perovskite-based systems.

This Special Issue aims to explore the latest developments in perovskite materials and their synthesis, characterization, and applications. It aligns with the scope of Inorganics, which focuses on fundamental and applied research in inorganic materials, including structural, electronic, and chemical properties. Given the rapid evolution of perovskite research, this issue seeks to highlight recent breakthroughs and address current challenges in perovskite stability, device integration, and new functional properties.

We welcome high-quality submissions covering both theoretical and experimental studies that contribute to advancing the understanding of perovskite materials. The goal is to compile at least 10 original contributions, and, if this number is reached, the Special Issue may be published as a book.

This Special Issue aims to cover the following topics:

Synthesis and structural tuning of perovskite materials;
Optoelectronic properties and device applications (solar cells, LEDs, and photodetectors);
Stability and degradation mechanisms in perovskites;
Computational modeling and theoretical insights into perovskite behavior;
Hybrid and inorganic perovskites for next-generation materials;
Perovskite-based catalysis and energy storage applications;
Advanced characterization techniques for perovskite materials;
Interface engineering and novel processing techniques.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) perovskite synthesis, material characterization, and applications.

We look forward to receiving your contributions.

Dr. Pengfei Wu
Guest Editor

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Inorganics is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

perovskite materials
hybrid perovskites
inorganic perovskites
stability and degradation
optoelectronic devices
photovoltaics
LEDs
catalysis
energy storage
interface engineering

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Published Papers (9 papers)

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Research

Jump to: Review

17 pages, 1536 KB

Open AccessArticle

Charge- and Orbital-Order Transitions in the A-Site-Ordered Quadruple Perovskite NdCuMn₆O₁₂

by Alexei A. Belik, Ran Liu, Lei Zhang, Yoshitaka Matsushita and Kazunari Yamaura

Inorganics 2026, 14(7), 174; https://doi.org/10.3390/inorganics14070174 - 26 Jun 2026

Viewed by 636

Abstract

AMn₇O₁₂ perovskites (with A = divalent elements) show complex structural and magnetic transitions including incommensurate orbital density waves and coupled/decoupled modulated spin helicity originating from charge-ordered Mn³⁺/Mn⁴⁺ cations with the 3:1 ratio at the B perovskite sites and unusual apically compressed Jahn–Teller distortions of MnO₆ octahedra. The same Mn³⁺:Mn⁴⁺ ratio can be achieved in RCuMn₆O₁₂ compositions, where R is a trivalent rare-earth cation. Therefore, the comparison in behavior of AMn₇O₁₂ and RCuMn₆O₁₂ is of interest. In this work, the A-site-ordered quadruple perovskite NdCuMn₆O₁₂ was prepared by a high-pressure high-temperature method. Its structural properties were investigated by synchrotron powder X-ray diffraction between 100 K and 350 K and laboratory powder X-ray diffraction between 5 K and 300 K. It shows a first-order structural phase transition from Im-3 symmetry (at high temperatures) to R-3 symmetry near 292 K. The structural transition is accompanied by charge (Mn³⁺/Mn⁴⁺) and unusual orbital (on the Jahn–Teller active Mn³⁺ cations located in MnO₆ octahedra) orders. However, no additional structural/orbital modulations were found at lower temperatures in comparison with AMn₇O₁₂. Magnetic properties were investigated by temperature- and field-dependent magnetization and specific heat measurements, where a ferrimagnetic transition was found near 120 K. In addition, low-temperature magnetic anomalies were observed near 20 K, probably originating from the Nd sublattice. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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19 pages, 14023 KB

Open AccessArticle

Wide-Bandgap A₂TiSiO₆ (A = Ca, Sr, Ba) Double Perovskites for Optoelectronic Applications

by Łukasz Szeleszczuk, Katarzyna Mądra-Gackowska and Marcin Gackowski

Inorganics 2026, 14(5), 130; https://doi.org/10.3390/inorganics14050130 - 8 May 2026

Cited by 5 | Viewed by 1131

Abstract

The structural, mechanical, electronic, and optical properties of cubic double perovskite oxides A₂TiSiO₆ (A = Ca, Sr, Ba) were systematically investigated using first-principles density functional theory calculations. Structural optimization within the GGA–PBE framework confirms that all compounds crystallize in a stable cubic phase. The negative formation energies indicate thermodynamic stability and potential experimental synthesizability. Ab initio molecular dynamics (AIMD) simulations performed at 300 K further confirm the dynamical stability of all compounds under finite-temperature conditions. The Born–Huang stability criteria performed elastic constant analysis establishes mechanical stability and the derived mechanical moduli indicate the presence of rigid but brittle behavior with moderate amounts of elastic anisotropy. Calculation of the electronic band structure reveals that all the compounds are direct wide-bandgap semiconductors, with the HSE06 bandgaps of Ca₂TiSiO₆, Sr₂TiSiO₆ as well as Ba₂TiSiO₆ being 2.61, 2.50 and 2.37 eV, respectively. The optical property analysis has shown that they are strong in terms of their absorption in the visible–ultraviolet region, with high dielectric constants and good refractive indices, which makes them appropriate in optoelectronics and photovoltaic applications. On the whole, A₂TiSiO₆ double perovskites are promising for use as wide-bandgap materials in the development of superior optoelectronic devices. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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11 pages, 2042 KB

Open AccessArticle

Enhanced Secondary Electron Emission from Strontium Titanate Films via High-Temperature Annealing

by Weiqiang Li, Dan Wang, Wei Zhao, Xiangping Zhu, Yongning He and Guohe Zhang

Inorganics 2026, 14(3), 71; https://doi.org/10.3390/inorganics14030071 - 27 Feb 2026

Viewed by 584

Abstract

The versatile surface reconstruction mechanisms, tunable surface properties, and exceptional electron emission characteristics of SrTiO₃ films have garnered significant research interest. In this study, SrTiO₃ films were synthesized on n-Si(100) substrates via radio frequency magnetron sputtering. To evaluate the impact of thermal annealing, the as-deposited films underwent post-deposition annealing in an oxygen ambient at 600 °C, 800 °C, and 1000 °C for a duration of 2 h each. The structural, chemical, and secondary electron emission (SEE) characteristics of the SrTiO₃ films were characterized as a function of their high thermal process. Post-deposition annealing induced a significant improvement in crystallinity, which directly correlated with a heightened SEE yield (SEY). Furthermore, composition analysis revealed a marked stoichiometric reconfiguration at the surface, with the Sr:Ti:O ratio evolving from 1:0.32:1.14 to 1:0.22:0.94, suggesting a move toward an Sr-O terminated surface. The Sr-O terminated surface inherent to these SrTiO₃ films promotes efficient electron escape due to its reduced work function. Following a 1000 °C annealing process, the peak SEY undergoes a significant shift from 2.11 to 2.76, representing a thermal optimization of the SEE performance by approximately 30.8%. High-temperature annealing enhances the SEE performance of SrTiO₃ films, validating their significant potential for electron multiplication applications. This study provides a scalable pathway for developing highly efficient SEE materials with optimized crystalline and surface properties. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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18 pages, 8819 KB

Open AccessArticle

Comparation of Graph Neural Networks and Traditional Machine Learning for Property Prediction in All-Inorganic Perovskite Materials

by Jingyu Liu, Xueqiong Su, Lishan Yang, Jiansen Ding, Jin Wang, Xing Ling, Yong Pan, Zhijun Wang, Wei Zhao and Yang Bu

Inorganics 2026, 14(2), 58; https://doi.org/10.3390/inorganics14020058 - 13 Feb 2026

Cited by 2 | Viewed by 958

Abstract

Machine learning (ML) methods have been widely explored for predicting material properties. However, due to the rapid development of ML techniques and the diversity of available models, performance comparisons between traditional and graph-based machine learning models remain limited. Therefore, we evaluate 11 conventional ML models alongside the graph neural network-based Crystal Graph Convolutional Neural Network (CGCNN) for predicting three key properties—formation energy (E_f), band gap (E_g), and energy above hull (E_h)—across a dataset comprising single perovskites, double perovskites, and their combined structures. The results demonstrate that for single perovskites, CGCNN exhibits gains of over 20% in the root mean square error (RMSE) relative to the second-best model (Gradient Boosting Regression), achieving values of 0.205 eV/atom (E_f), 0.718 eV (E_g), and 0.167 eV/atom (E_h). Prediction accuracy for double perovskites is significantly enhanced by training CGCNN on a combined dataset, particularly for E_h, where the coefficient of determination (R²) improves approximately 68.1-fold compared to models trained exclusively on double-perovskite data. Feature importance analysis via one-shot, permutation-based, and recursive feature elimination (RFE) methods reveals that optimal model performance requires retention of at least the top 20 critical features. Furthermore, feature utilization patterns of CGCNN across different prediction tasks are visualized. This work provides actionable guidelines for model selection and feature engineering in perovskite property prediction, establishing a benchmark for future ML-driven materials discovery. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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28 pages, 19314 KB

Open AccessArticle

Texturing (Na_0.5Bi_0.5)TiO₃-KNbO₃-SrTiO₃ Electrostrictive Ceramics by Templated Grain Growth Using (Na_0.5Bi_0.5)TiO₃ Platelets

by Arum Ayuningsih, Nazım Ecebaş, Tran Thi Huyen Tran, John G. Fisher, Jong-Sook Lee, Woo-Jin Choi and Wook Jo

Inorganics 2025, 13(12), 387; https://doi.org/10.3390/inorganics13120387 - 26 Nov 2025

Cited by 3 | Viewed by 1107

Abstract

Electrostriction is an intriguing behaviour of dielectric materials, characterized by stable electrostrain with minimal hysteresis. (Na_0.5Bi_0.5)TiO₃-based ceramics show promising electrostrictive behaviour, particularly the 0.90(Na_0.5Bi_0.5)TiO₃-0.08KNbO₃-0.02SrTiO₃ composition located near the morphotropic phase boundary between ferroelectric rhombohedral and relaxor pseudocubic phases. The templated grain growth method has been effectively used to control the grain orientation of NBT-based systems, thereby enhancing their electrical properties. In this study, texturing was introduced to 0.90(Na_0.5Bi_0.5)TiO₃-0.08KNbO₃-0.02SrTiO₃ ceramics through homoepitaxial NBT platelets prepared via a three-step molten salt/topochemical microcrystal conversion method. By adding 4 wt% of NBT platelets combined with optimized sintering conditions, textured ceramics were prepared exhibiting a high Lotgering factor of 83% with enhancement of strain (0.02%) and polarization (3 µC/cm²) at an electric field of 40 kV/cm, as well as stable dielectric permittivity between 130 and 300 °C. Moreover, the electrostrictive coefficient of textured ceramics increased by ~0.004 C²m⁻⁴ compared to that of untextured ceramics, confirming the improvement of the electrostrictive response. These results demonstrate that homoepitaxial templating effectively improves the electrical properties of NBT-KN-ST ceramics while preserving their electrostrictive nature, which offers a viable route for designing lead-free electrostrictive materials. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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19 pages, 2194 KB

Open AccessArticle

Hidden Magnetic-Field-Induced Multiferroic States in A-Site-Ordered Quadruple Perovskites RMn₃Ni₂Mn₂O₁₂: Dielectric Studies

by Alexei A. Belik, Ran Liu and Kazunari Yamaura

Inorganics 2025, 13(10), 315; https://doi.org/10.3390/inorganics13100315 - 25 Sep 2025

Viewed by 1107

Abstract

The appearance of spin-induced ferroelectric polarization in the so-called type-II multiferroic materials has received a lot of attention. The nature and mechanisms of such polarization were intensively studied using perovskite rare-earth manganites, RMnO₃, as model systems. Later, multiferroic properties were discovered in some RFeO₃ perovskites and possibly in some RCrO₃ perovskites. However, R₂NiMnO₆ double perovskites have ferromagnetic structures that do not break the inversion symmetry. It was found recently that more complex magnetic structures are realized in A-site-ordered quadruple perovskites, RMn₃Ni₂Mn₂O₁₂. Therefore, they have the potential to be multiferroics. In this work, dielectric properties in magnetic fields up to 9 T were investigated for such perovskites as RMn₃Ni₂Mn₂O₁₂ with R = Ce to Ho and for BiMn₃Ni₂Mn₂O₁₂. The samples with R = Bi, Ce, and Nd showed no dielectric anomalies at all magnetic fields, and the dielectric constant decreases with decreasing temperature. The samples with R = Sm to Ho showed qualitatively different behavior when the dielectric constant started increasing with decreasing temperature below certain temperatures close to the magnetic ordering temperatures, T_N. This difference could suggest different magnetic ground states. The samples with R = Eu, Dy, and Ho still showed no anomalies on the dielectric constant. On the other hand, peaks emerged at T_N on the dielectric constant in the R = Sm sample from about 2 T up to the maximum available field of 9 T. The Gd sample showed peaks on dielectric constant at T_N between about 1 T and 7 T. Transition temperatures increase with increasing magnetic fields for R = Sm and decrease for R = Gd. These findings suggest the presence of magnetic-field-induced multiferroic states in the R = Sm and Gd samples with intermediate ionic radii. Dielectric properties at different magnetic fields are also reported for Lu₂NiMnO₆ for comparison. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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Review

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29 pages, 2287 KB

Open AccessReview

A Review of Synthesis, Characterization, Properties, and Applications of Double Perovskite Oxides

by Pablo V. Tuza and Mariana M. V. M. Souza

Inorganics 2025, 13(11), 372; https://doi.org/10.3390/inorganics13110372 - 7 Nov 2025

Cited by 12 | Viewed by 4578

Abstract

Double perovskites are represented by the formula A₂BB’O₆ and AA’BB’O₆. These materials have been synthesized using the solid-state reaction, sol–gel, Pechini, and hydrothermal methods. X-ray fluorescence, X-ray diffraction, magnetic measurements, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction, synchrotron X-ray diffraction, neutron powder diffraction, extended X-ray absorption fine structure, and Raman spectroscopy have been used for the characterization of double perovskites. X-ray diffraction, synchrotron X-ray diffraction, and neutron powder diffraction coupled with the Rietveld method determine the crystal structure of a sample. These materials present various properties and applications. The present review aims (i) to report a process to determine the symmetry, apparent size, and apparent strain using the Rietveld method; (ii) show how experimental characterization techniques complement each other in the investigation of double perovskites; (iii) describe how the synthesis method can help in the uncovering of double perovskites with improved properties; and (iv) exemplify some of the main applications of double perovskites. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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27 pages, 4601 KB

Open AccessReview

Recent Progress of Plasmonic Perovskite Photodetectors

by Hongki Kim, Jeongeun Lee, Chae Bin Lee and Yoon Ho Lee

Inorganics 2025, 13(11), 351; https://doi.org/10.3390/inorganics13110351 - 27 Oct 2025

Cited by 5 | Viewed by 3022

Abstract

Perovskite materials have emerged as promising candidates for next-generation photodetectors (PDs) owing to their superior optoelectronic properties and compatibility with low-cost, low-temperature fabrication processes. Broad applicability of PDs spans diverse fields, including X-ray detection, wearable electronics, autonomous vehicles, artificial intelligence, imaging, optical communication, and biomedical sensing, offering advantages over conventional semiconductor PDs based on Si, Ge, InGaAs, and GaN. The integration of plasmonic nanostructures into perovskite-based devices has recently emerged as an effective strategy to enhance performance by amplifying light absorption near the perovskite layer. This review summarizes recent advances and design strategies for plasmonic-integrated perovskite photodetectors (Pe-PDs), with a particular emphasis on plasmonic nanopatterns and nanoparticles as viable approaches for solution-processable Pe-PDs. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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21 pages, 11004 KB

Open AccessReview

Mitigating Lead Toxicity in Halide Perovskite Solar Cells: Strategies for Sustainable Development

by Wenguang Li, Tianci Mi, Tian Tian, Meifang Yang and Huan Pang

Inorganics 2025, 13(4), 123; https://doi.org/10.3390/inorganics13040123 - 13 Apr 2025

Cited by 25 | Viewed by 9081

Abstract

Halide perovskite solar cells (PSCs) exhibit remarkable potential for addressing global energy challenges due to their exceptional photovoltaic properties and cost-effectiveness. However, their widespread adoption is hindered by the presence of toxic lead in the perovskite materials, posing risks to both human health and the environment. This review comprehensively examines the environmental safety concerns associated with PSCs, focusing on the toxicity of lead and its potential for leakage during device operation and end-of-life disposal. Strategies to mitigate lead leakage are explored, including advanced external encapsulation methods, internal lead immobilization techniques, and innovative recycling approaches. These strategies are evaluated based on their effectiveness, feasibility, and potential challenges, highlighting the need for a multi-pronged approach to ensure the responsible and sustainable development of PSC technology. By addressing the toxicity issue and implementing robust prevention and recycling strategies, PSCs can become a driving force for the global transition towards clean and renewable energy while minimizing environmental and health risks. Full article

(This article belongs to the Special Issue Recent Progress in Perovskites)

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