☆ 4.1 Review

Recent progress on advanced transmission electron microscopy characterization for halide perovskite semiconductors

JOURNAL OF SEMICONDUCTORS (2022)

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Atomically Resolved Electrically Active Intragrain Interfaces in Perovskite Semiconductors

Songhua Cai et al.

Summary: This study resolves the atomic-scale structural information on three prototypical intragrain interfaces using scanning transmission electron microscopy and establishes models for the calculation of electronic properties. The results show that these intragrain interfaces are generally electronically benign, but their interaction with point defects can have detrimental effects. This research contributes to a better understanding of the microscopic structure-property-performance relationship in metal halide perovskites.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Cryogenic Focused Ion Beam Enables Atomic-Resolution Imaging of Local Structures in Highly Sensitive Bulk Crystals and Devices

Jinfei Zhou et al.

Summary: This study reports that cryogenic focused ion beam (cryo-FIB) can be used for specimen preparation of highly sensitive materials, expanding the applications of electron microscopy. It enables the imaging of complex local structures at an atomic resolution and the discovery of new material structures.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Multidisciplinary Sciences

Conformal quantum dot-SnO2 layers as electron transporters for efficient perovskite solar cells

Minjin Kim et al.

Summary: The study replaced the commonly used mesoporous titanium dioxide electron transport layer with a thin layer of polyacrylic acid-stabilized tin(IV) oxide quantum dots, which improved the efficiency and stability of perovskite solar cells and enabled successful scaling up of PSCs production.

SCIENCE (2022)

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Review Chemistry, Multidisciplinary

Physical Fields Manipulation for High-Performance Perovskite Photovoltaics

Cong-Cong Zhang et al.

Summary: This review summarizes the progress of external field manipulation in metal halide perovskite solar cells (PSCs), including electric field, magnetic field, light field, stress field, and thermal field. The influences of these fields on PSCs are summarized and prospective research directions are proposed.

SMALL (2022)

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Article Physics, Condensed Matter

The scanning tunneling microscopy and spectroscopy of GaSb1- x Bi x films of a few-nanometer thickness grown by molecular beam epitaxy

Fangxing Zha et al.

Summary: The ultrahigh vacuum scanning tunneling microscope was used to characterize GaSb1- (x) Bi (x) films of a few nanometers thickness grown by molecular beam epitaxy on GaSb buffer layers. It was found that the 10 nm film displayed a Stranski-Krastinov growth mode, while the 5 nm film showed a two-dimensional growth mode.

JOURNAL OF SEMICONDUCTORS (2021)

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Article Chemistry, Physical

Nanometric Chemical Analysis of Beam-Sensitive Materials: A Case Study of STEM-EDX on Perovskite Solar Cells

Felix Utama Kosasih et al.

Summary: This study investigates the effect of electrons on a model hybrid halide perovskite, focusing on the relationship between electron dose, data quality, and beam damage. The primary manifestation of electron beam damage in the perovskite specimen is found to be the loss of iodine due to vacancy creation, with iodine content decreasing exponentially with electron dose. The systematic variation of acquisition parameters demonstrates data acquisition and analysis strategies for studying electron beam damage and achieving reliable quantification for a broad range of beam-sensitive materials.

SMALL METHODS (2021)

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Review Multidisciplinary Sciences

Dynamic structural property of organic-inorganic metal halide perovskite

Jin-Wook Lee et al.

Summary: Unique organic-inorganic hybrid semiconducting materials, known as perovskite solar cells, have achieved a significant breakthrough in the field of photovoltaics with a power conversion efficiency of 25.5%. The dynamic properties of the A site cationic molecules and PbI6 octahedrons in these materials have attracted a large number of researchers due to their dramatically different properties from traditional semiconductors.

ISCIENCE (2021)

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Article Chemistry, Physical

Twist-to-Untwist Evolution and Cation Polarization Behavior of Hybrid Halide Perovskite Nanoplatelets Revealed by Cryogenic Transmission Electron Microscopy

Yuanmin Zhu et al.

Summary: Hybrid methylammonium lead iodide perovskite nanoplatelets (MAPbI(3) NPLs) are promising optoelectronic materials with remarkable properties, but their detailed formation mechanism has been a mystery due to their intrinsic vulnerability towards moisture and electron beams. By using a low electron dose cryogenic TEM imaging technique, atomic structures of MAPbI(3) NPLs have been visualized, showing a twist-to-untwist structural evolution. Additionally, observation of MA cation polarization in single-crystalline MAPbI(3) NPLs demonstrates high ion mobility in the lattice of hybrid halide perovskites.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Chemistry, Physical

Cyanamide Passivation Enables Robust Elemental Imaging of Metal Halide Perovskites at Atomic Resolution

Jiakai Liu et al.

Summary: This study reports the fabrication of CsPbBr3 nanoplates with high beam stability using a regrowth strategy assisted by cyanamide. The ultrahigh stability of the nanoplates is attributed to defect-healing self-assembly/regrowth processes and surface modulation by strong electron-withdrawing cyanamide molecules. The atomic-resolution EDS elemental mapping of the as-prepared CsPbBr3 nanoplates revealed unprecedented details of LHP nanostructures, highlighting the importance of improving beam stability for fundamental research on LHPs.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Multidisciplinary Sciences

Stabilized tilted-octahedra halide perovskites inhibit local formation of performance-limiting phases

Tiarnan A. S. Doherty et al.

Summary: This study successfully introduced octahedral tilting into pure alpha-FAPbI(3) thin films by using surface-bound ethylenediaminetetraacetic acid, ensuring extremely stability against thermal, environmental, and light stressors.

SCIENCE (2021)

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Article Chemistry, Physical

Probing the Electron Beam-Induced Structural Evolution of Halide Perovskite Thin Films by Scanning Transmission Electron Microscopy

Xian-Gang Zhou et al.

Summary: The study revealed that the structural changes in gamma-CsPbIBr2 thin films under electron beam irradiation are dependent on the overall electron dose rather than the dose rate. Increasing electron dose leads to the formation of Pb nanoparticles and the transformation of the remaining framework into the Cs2IBr phase, accompanied by some amorphization. This research provides insights on minimizing electron beam irradiation artifacts for atomic-resolution imaging on CsPbIBr2 thin films.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

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Article Multidisciplinary Sciences

Probing atomic structure of beam-sensitive energy materials in their native states using cryogenic transmission electron microscopes

Yuanmin Zhu et al.

Summary: The study utilized ultra-low-dose cryo-TEM to characterize the atomic-scale structure of organic-inorganic hybrid perovskite nanoplatelets, revealing the growth pattern and crystal structure evolution. Insights gained from atomic-scale investigations may have significant impacts on the development of battery materials and solar energy technologies.

ISCIENCE (2021)

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Review Chemistry, Multidisciplinary

Origin, Influence, and Countermeasures of Defects in Perovskite Solar Cells

Yutian Lei et al.

Summary: Defects are considered to be one of the most significant factors affecting the power conversion efficiency and long-term stability of perovskite solar cells. Various methods to reduce defect density and improve device performance and long-term stability are introduced, including additive engineering, surface passivation, and other physical treatments. Further understanding of defects and the development trends of passivation strategies are also discussed.

SMALL (2021)

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Review Multidisciplinary Sciences

Strain in perovskite solar cells: origins, impacts and regulation

Jinpeng Wu et al.

Summary: The article reviews the rapid increase in power conversion efficiencies of metal halide perovskite solar cells, yet commercialization still faces challenges, particularly in stability. It emphasizes the importance of understanding the sources of material stability and strain regulation strategies for improving stability.

NATIONAL SCIENCE REVIEW (2021)

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Review Chemistry, Multidisciplinary

Cryogenic Electron Microscopy for Energy Materials

Zewen Zhang et al.

Summary: The development of clean energy technologies, such as high energy density batteries and high efficiency solar cells, relies on a deep understanding of key materials and processes at atomic and molecular levels. Cryogenic electron microscopy (cryo-EM) is emerging as a powerful tool to investigate sensitive materials in energy science, providing opportunities for breakthroughs and discoveries. Low-temperature methods can protect and stabilize reactive components, offering insights into materials design and practical applications in energy research.

ACCOUNTS OF CHEMICAL RESEARCH (2021)

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Article Physics, Applied

Energy-dependent knock-on damage of organic-inorganic hybrid perovskites under electron beam irradiation: First-principles insights

Zenghua Cai et al.

Summary: First-principles calculations show significant knock-on atomic displacement damage in the organic-inorganic hybrid perovskite CH3NH3PbI3, with displacement of H, C, N, and I atoms dependent on incident energy. High-energy irradiation can cause simultaneous loss of CH3NH3 and I due to knock-on displacements, which may impact experimental conclusions.

APPLIED PHYSICS LETTERS (2021)

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Article Chemistry, Physical

Metal Oxide-Induced Instability and Its Mitigation in Halide Perovskite Solar Cells

Sampreetha Thampy et al.

Summary: Research highlights the importance of long-term stability in halide perovskite solar cells for practical applications. Interfacial interactions between transport layers and perovskite absorbers may lead to instability and impact device performance. Various degradation mechanisms and mitigation strategies have been discussed in order to achieve high-performing and stable PSCs.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Chemistry, Multidisciplinary

Perovskite Quantum Dots Encapsulated in a Mesoporous Metal-Organic Framework as Synergistic Photocathode Materials

Guan-Yu Qiao et al.

Summary: Encapsulating CsPbBr3 nanocrystals into a stable metal-organic framework greatly enhances their photocatalytic performance, with significant charge transfer observed at the interface between the quantum dots and the MOF. This composite material shows excellent catalytic activity in oxygen reduction and evolution reactions, as well as serving as a synergistic photocathode in Li-O-2 batteries, highlighting the cooperative effect between CsPbBr3 and PCN-333(Fe).

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Materials Science, Multidisciplinary

Making the most of your electrons: Challenges and opportunities in characterizing hybrid interfaces with STEM

Stephanie M. Ribet et al.

Summary: The interaction between hard and soft materials in hybrid structures has sparked significant interest, promising technological applications in catalysis, environmental remediation, optoelectronics, and medicine. The interfacial structure between hard and soft phases strongly influences the functionality of these materials, presenting challenges in assessing structure-property relationships. Experimental investigations and simulations offer solutions for understanding these interfaces at a nano or molecular level.

MATERIALS TODAY (2021)

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Review Materials Science, Multidisciplinary

Advances and Applications of Atomic-Resolution Scanning Transmission Electron Microscopy

Jingyue (Jimmy) Liu

Summary: Advances in atomic-resolution STEM imaging have been driven by innovative designs in electron optical systems, developments in detector technology, improvements in image acquisition and processing algorithms, and advancements in precision machining. These factors have not only made atomic-resolution STEM imaging more accessible in practical materials research, but also indicate a growing need for further hardware and software development to achieve three-dimensional atomic-resolution STEM imaging with single-atom chemical sensitivity. Additionally, the integration of artificial intelligence, machine learning, and big-data science is expected to significantly enhance the impact of STEM techniques on a wide range of research fields.

MICROSCOPY AND MICROANALYSIS (2021)

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Article Multidisciplinary Sciences

Atomic-scale imaging of CH3NH3PbI3 structure and its decomposition pathway

Shulin Chen et al.

Summary: This study investigates the atomic structure and decomposition pathway of organic-inorganic hybrid perovskites, revealing a two-step decomposition process and an intermediate phase. The findings enhance understanding of the photoelectric properties and failure mechanism, offering insights into prevention and recovery of perovskite structure.

NATURE COMMUNICATIONS (2021)

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Article Chemistry, Physical

Unraveling the influence of CsCl/MACl on the formation of nanotwins, stacking faults and cubic supercell structure in FA-based perovskite solar cells

Huyen T. Pham et al.

Summary: The addition of CsCl/MACl additives has been found to stabilize the cubic FAPbI3 perovskite, leading to a lattice contraction and changes in the optical bandgap. This results in reduced defects, improved photoluminescence yield, and enhanced device performance, with a maximum efficiency of 21.98% measured for the 10 mol% CsCl perovskite layer.

NANO ENERGY (2021)

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Review Multidisciplinary Sciences

Polar or nonpolar? That is not the question for perovskite solar cells

Boyuan Huang et al.

Summary: Perovskite solar cells are promising next generation photovoltaic technologies, and the debate over the polarity of organic-inorganic halide perovskites (OIHPs) continues. The understanding of OIHPs polarity is crucial for photovoltaic conversion and integration of different techniques in the future may help to settle the debate.

NATIONAL SCIENCE REVIEW (2021)

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Article Chemistry, Physical

Imaging Real-Time Amorphization of Hybrid Perovskite Solar Cells under Electrical Biasing

Min-cheol Kim et al.

Summary: Perovskite solar cells have achieved world-record-setting photovoltaic performances, but their practicality is limited by structural instability caused by ion migration and defect formation. Researchers have developed a new method to observe real-time changes in the structure and found that heating the samples can effectively restore performance losses.

ACS ENERGY LETTERS (2021)

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Article Energy & Fuels

The critical role of composition-dependent intragrain planar defects in the performance of MA1-xFAxPbI3 perovskite solar cells

Wei Li et al.

Summary: The study shows that controlling intragrain defects can improve the performance of perovskite solar cells, and reducing the density of intragrain planar defects can enhance the device performance.

NATURE ENERGY (2021)

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Article Materials Science, Multidisciplinary

Multimodal microscopy characterization of halide perovskite semiconductors: Revealing a new world (dis)order

Samuel D. Stranks

Summary: Halide perovskites exhibit heterogeneity in their properties on different length scales, with grain, sub-grain, and atomic scales being the most important yet least understood. Efforts to understand these relationships through multimodal and correlative microscopy have led to key conclusions to enhance performance and stability. Future adaptations will utilize machine-learning algorithms to process large datasets and operando measurements for refining processing and device architectures.

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A Microstructural Analysis of 2D Halide Perovskites: Stability and Functionality

Susmita Bhattacharya et al.

Summary: Recent observations have shown that the photoelectric conversion properties of perovskite materials are closely related to the presence of superlattice structures and other unusual nanoscale features. Low-dimensional or mixed-dimensional halide perovskite families are found to be more efficient for device applications than three-dimensional perovskites. The emergence of perovskite solar cells has revolutionized the solar cell industry due to their flexible architecture and rapidly increasing efficiency.

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Molecular-Level Insight into Correlation between Surface Defects and Stability of Methylammonium Lead Halide Perovskite Under Controlled Humidity

Mohammad Ali Akhavan Kazemi et al.

Summary: This study combines multiple techniques to reveal the degradation mechanisms of perovskite photovoltaic materials in humid environments, providing new insights for understanding and improving their stability.

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Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs

Chang Liu et al.

NANO LETTERS (2020)

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Temperature-Driven Transformation of CsPbBr3 Nanoplatelets into Mosaic Nanotiles in Solution through Self-Assembly

Zhiya Dang et al.

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Cryo-focused ion beam preparation of perovskite based solar cells for atom probe tomography

Nicolas Alfonso Rivas et al.

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Electron-Beam-Related Studies of Halide Perovskites: Challenges and Opportunities

Junhui Ran et al.

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Atomic-Resolution Imaging of Halide Perovskites Using Electron Microscopy

Kepeng Song et al.

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General Decomposition Pathway of Organic-Inorganic Hybrid Perovskites through an Intermediate Superstructure and its Suppression Mechanism

Shulin Chen et al.

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Synthesis of Highly-Oriented Black CsPbI3 Microstructures for High-Performance Solar Cells

Tao Ye et al.

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Synthesis and dimensional control of CsPbBr3 perovskite nanocrystals using phosphorous based ligands

Fiona McGrath et al.

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Atomic-Scale Insights into the Dynamics of Growth and Degradation of All-Inorganic Perovskite Nanocrystals

Ting Wang et al.

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Transmission electron microscopy of organic-inorganic hybrid perovskites: myths and truths

Shulin Chen et al.

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Type-II Lateral Heterostructures of Monolayer Halide Double Perovskites for Optoelectronic Applications

Hongxia Zhong et al.

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Direct atomic scale characterization of the surface structure and planar defects in the organic-inorganic hybrid CH3NH3PbI3 by Cryo-TEM

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Observation of Structural Phase Transitions and Pbl2 Formation During the Degradation of Triple-Cation Double-Halide Perovskites

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Coherent single-photon emission from colloidal lead halide perovskite quantum dots

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Microstructural Study of Two-Dimensional Organic-Inorganic Hybrid Perovskite Nanosheet Degradation under Illumination

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Pb clustering and PbI2 nanofragmentation during methylammonium lead iodide perovskite degradation

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Unravelling Degradation Mechanisms and Atomic Structure of Organic-Inorganic Halide Perovskites by Cryo-EM

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Cs2InAgCl6: A New Lead-Free Halide Double Perovskite with Direct Band Gap

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Ruddlesden-Popper Phase in Two-Dimensional Inorganic Halide Perovskites: A Plausible Model and the Supporting Observations

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