Jonghee Yang
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View article: High-Throughput Automated Discovery of Temperature-Benign Dion-Jacobson Quasi-2D Halide Perovskites
High-Throughput Automated Discovery of Temperature-Benign Dion-Jacobson Quasi-2D Halide Perovskites Open
Dion-Jacobson (DJ) quasi-two-dimensional (2D) halide perovskites (HPs) have emerged as a robust platform for optoelectronic applications, yet their crystallization pathways, encompassing nucleation, growth and phase transformation, under n…
View article: Understanding Synthesis Space in Ligand-Assisted Reprecipitated CsPb(BrxI1-x)3 Perovskite Nanocrystals
Understanding Synthesis Space in Ligand-Assisted Reprecipitated CsPb(BrxI1-x)3 Perovskite Nanocrystals Open
Ligand-assisted reprecipitation (LARP)-based synthetic approach has gained attention as a promising method for scalable synthesis of perovskite nanocrystals (PNCs) with outstanding optoelectronic functionalities. However, such distinct syn…
View article: LLM-Guided Ligand Design for Controlling Nanoscopic Morphology of CsPbBr3 Perovskite Nanocrystals
LLM-Guided Ligand Design for Controlling Nanoscopic Morphology of CsPbBr3 Perovskite Nanocrystals Open
Traditional nanocrystal ligand design often relies on trial-and-error, limiting systematic exploration. Here, we present a framework integrating a Large Language Model (LLM) agent into experimental planning, iteratively refining ligand des…
View article: Nanofabrication of sharp conductive diamond tip probe chips and their application in reverse tip sample scanning probe microscopy
Nanofabrication of sharp conductive diamond tip probe chips and their application in reverse tip sample scanning probe microscopy Open
Recently, a new scanning probe microscopy (SPM) concept called reverse tip sample scanning probe microscopy (RTS SPM) was introduced. Here, a sample is mounted at the end of a cantilever beam and scans over a tip that is integrated into an…
View article: Microsecond Bias Polarity Switching Reveals Hidden Charge Dynamics at Halide Perovskite Interfaces
Microsecond Bias Polarity Switching Reveals Hidden Charge Dynamics at Halide Perovskite Interfaces Open
We present a time-domain technique based on rapid bias polarity switching (BiPS) to probe charge transport and near-surface defects in halide perovskite single crystals. The method exploits interfacial extraction barriers, which cause carr…
View article: Impact of Halogen Groups on the Properties of PEA‐Based 2D Pb–Sn Halide Perovskites
Impact of Halogen Groups on the Properties of PEA‐Based 2D Pb–Sn Halide Perovskites Open
Tuning broad emission in 2D Pb–Sn halide perovskites (HPs) is essential for advancing optoelectronic applications, particularly for color‐tunable and white‐light‐emitting devices. This broad emission is linked to structural factors, such a…
View article: Tailoring Molecular Space to Navigate Phase Complexity in Cs‐Based Quasi‐2D Perovskites via Gated‐Gaussian‐Driven High‐Throughput Discovery
Tailoring Molecular Space to Navigate Phase Complexity in Cs‐Based Quasi‐2D Perovskites via Gated‐Gaussian‐Driven High‐Throughput Discovery Open
Cesium‐based quasi‐2D halide perovskites (HPs) offer promising functionalities and low‐temperature manufacturability, suited to stable tandem photovoltaics. However, the chemical interplays between the molecular spacers and the inorganic b…
View article: Fluoride and nitrogen contamination and potential health risks in the groundwater of a typical agricultural region
Fluoride and nitrogen contamination and potential health risks in the groundwater of a typical agricultural region Open
Fluoride and nitrogen contamination is a global concern and has been a serious problem in agricultural areas. This study aims to identify the source of fluoride and nitrogen in the groundwater and assess groundwater quality and human healt…
View article: In situ formation of pseudohalide anions induced by humid air and light passivates formamidinium‐based halide perovskites
In situ formation of pseudohalide anions induced by humid air and light passivates formamidinium‐based halide perovskites Open
Metal halide perovskites based on formamidinium (FA), or FA‐rich compositions have shown great promise for high‐performance photovoltaics. A deeper understanding of the impact of ambient conditions (e.g., moisture, oxygen, and illumination…
View article: Tailoring Molecular Space to Navigate Phase Complexity in Cs-based Quasi-2D Perovskites via Gated-Gaussian-Driven High-Throughput Discovery
Tailoring Molecular Space to Navigate Phase Complexity in Cs-based Quasi-2D Perovskites via Gated-Gaussian-Driven High-Throughput Discovery Open
Cesium-based quasi-two-dimensional (2D) halide perovskites (HPs) offer promising functionalities and low-temperature manufacturability, which are suited to stable tandem photovoltaics (PVs). However, the chemical interplays between the mol…
View article: Decoding the Broadband Emission of 2D Pb‐Sn Halide Perovskites through High‐Throughput Exploration
Decoding the Broadband Emission of 2D Pb‐Sn Halide Perovskites through High‐Throughput Exploration Open
Unlike single‐component 2D metal halide perovskites (MHPs) exhibiting sharp excitonic photoluminescence (PL), a broadband PL emerges in mixed Pb‐Sn 2D lattices. Two physical models –self‐trapped exciton and defect‐induced Stokes‐shift – ar…
View article: Accelerating Materials Discovery by High‐Throughput GIWAXS Characterization of Quasi‐2D Formamidinium Metal Halide Perovskites
Accelerating Materials Discovery by High‐Throughput GIWAXS Characterization of Quasi‐2D Formamidinium Metal Halide Perovskites Open
The intriguing functionalities of emerging quasi‐2D metal halide perovskites (MHPs) have led to further exploration of this material class for sustainable and scalable optoelectronic applications. However, the chemical complexities in prec…
View article: Coexistence and Interplay of Two Ferroelectric Mechanisms in Zn<sub>1‐x</sub>Mg<sub>x</sub>O
Coexistence and Interplay of Two Ferroelectric Mechanisms in Zn<sub>1‐x</sub>Mg<sub>x</sub>O Open
Ferroelectric materials promise exceptional attributes including low power dissipation, fast operational speeds, enhanced endurance, and superior retention to revolutionize information technology. However, the practical application of ferr…
View article: Bromine Incorporation Affects Phase Transformations and Thermal Stability of Lead Halide Perovskites
Bromine Incorporation Affects Phase Transformations and Thermal Stability of Lead Halide Perovskites Open
Mixed-cation and mixed-halide lead halide perovskites show great potential for their application in photovoltaics. Many of the high-performance compositions are made of cesium, formamidinium, lead, iodine, and bromine. However, incorporati…
View article: Supramolecular design principles in pseudohalides for high-performance perovskite solar mini modules
Supramolecular design principles in pseudohalides for high-performance perovskite solar mini modules Open
View article: Ligand-induced self-assembly of twisted two-dimensional halide perovskites
Ligand-induced self-assembly of twisted two-dimensional halide perovskites Open
Two-dimensional (2D) halide perovskites (HPs) are now an emerging materials system that exhibits intriguing optoelectronic functionalities. Conventionally, they have been synthesized with linear and/or planar molecular spacers, rendering n…
View article: Coexistence and interplay of two ferroelectric mechanisms in Zn1-xMgxO
Coexistence and interplay of two ferroelectric mechanisms in Zn1-xMgxO Open
Ferroelectric materials promise exceptional attributes including low power dissipation, fast operational speeds, enhanced endurance, and superior retention to revolutionize information technology. However, the practical application of ferr…
View article: Physics-driven discovery and bandgap engineering of hybrid perovskites
Physics-driven discovery and bandgap engineering of hybrid perovskites Open
Discovery of physical models of binary compositions using structured Gaussian Process (sGP) with physics-informed mean functions, optimizing materials post-discovery to enhance design and application efficiency.
View article: Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites
Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites Open
The intriguing functionalities of emerging quasi-two-dimensional (2D) metal halide perovskites (MHPs) have led to further exploration of this material class for sustainable and scalable optoelectronic applications. However, the chemical co…
View article: Synergistic Surface Modification for High‐Efficiency Perovskite Nanocrystal Light‐Emitting Diodes: Divalent Metal Ion Doping and Halide‐Based Ligand Passivation
Synergistic Surface Modification for High‐Efficiency Perovskite Nanocrystal Light‐Emitting Diodes: Divalent Metal Ion Doping and Halide‐Based Ligand Passivation Open
Surface defects of metal halide perovskite nanocrystals (PNCs) substantially compromise the optoelectronic performances of the materials and devices via undesired charge recombination. However, those defects, mainly the vacancies, are stru…
View article: Decoding the Broadband Emission of Two-Dimensional Pb-Sn Halide Perovskites through High-Throughput Exploration
Decoding the Broadband Emission of Two-Dimensional Pb-Sn Halide Perovskites through High-Throughput Exploration Open
Unlike single-component two-dimensional (2D) metal halide perovskites (MHPs) exhibiting sharp excitonic photoluminescence (PL), a broadband PL emerges in mixed Pb-Sn 2D lattices. Two physical models –self-trapped exciton and defect-induced…
View article: High‐Throughput Automated Exploration of Phase Growth Behaviors in Quasi‐2D Formamidinium Metal Halide Perovskites (Adv. Energy Mater. 43/2023)
High‐Throughput Automated Exploration of Phase Growth Behaviors in Quasi‐2D Formamidinium Metal Halide Perovskites (Adv. Energy Mater. 43/2023) Open
View article: Physics-driven discovery and bandgap engineering of hybrid perovskites
Physics-driven discovery and bandgap engineering of hybrid perovskites Open
The unique aspect of the hybrid perovskites is their tunability, allowing to engineer the bandgap via substitution. From application viewpoint, this allows creation of the tandem cells between perovskites and silicon, or two or more perovs…
View article: High‐Throughput Automated Exploration of Phase Growth Behaviors in Quasi‐2D Formamidinium Metal Halide Perovskites
High‐Throughput Automated Exploration of Phase Growth Behaviors in Quasi‐2D Formamidinium Metal Halide Perovskites Open
Quasi‐2D metal halide perovskites (MHPs) are an emerging material platform for sustainable functional optoelectronics, but the uncontrollable, broad phase distribution remains a critical challenge for applications. Nevertheless, the basic …
View article: The Role of SnO<sub>2</sub> Processing on Ionic Distribution in Double-Cation–Double Halide Perovskites
The Role of SnO<sub>2</sub> Processing on Ionic Distribution in Double-Cation–Double Halide Perovskites Open
Moving toward a future of efficient, accessible, and less carbon-reliant energy devices has been at the forefront of energy research innovations for the past 30 years. Metal-halide perovskite (MHP) thin films have gained significant attent…
View article: High-Throughput Automated Exploration of Phase Growth Behaviors in Quasi-2D Formamidinium Metal Halide Perovskites
High-Throughput Automated Exploration of Phase Growth Behaviors in Quasi-2D Formamidinium Metal Halide Perovskites Open
Quasi-two-dimensional (2D) metal halide perovskites (MHPs) are an emerging material platform for sustainable functional optoelectronics, however the uncontrollable, broad phase distribution remains a critical challenge for applications. Th…
View article: Disentangling Electronic Transport and Hysteresis at Individual Grain Boundaries in Hybrid Perovskites via Automated Scanning Probe Microscopy
Disentangling Electronic Transport and Hysteresis at Individual Grain Boundaries in Hybrid Perovskites via Automated Scanning Probe Microscopy Open
Underlying the rapidly increasing photovoltaic efficiency and stability of metal halide perovskites (MHPs) is the advancement in the understanding of the microstructure of polycrystalline MHP thin film. Over the past decade, intense effort…
View article: Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites
Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites Open
The intriguing functionalities of emerging quasi-two-dimensional (2D) metal halide perovskites (MHPs) have led to further exploration of this material class for sustainable and scalable optoelectronic applications. However, the chemical co…
View article: Structurally Driven Ultrafast Charge Funneling in Organic Bulk Heterojunction Hole Transport Layer for Efficient Colloidal Quantum Dot Photovoltaics (Adv. Energy Mater. 20/2023)
Structurally Driven Ultrafast Charge Funneling in Organic Bulk Heterojunction Hole Transport Layer for Efficient Colloidal Quantum Dot Photovoltaics (Adv. Energy Mater. 20/2023) Open
Colloidal Quantum Dot Photovoltaics In article number 2203749, Edward H. Sargent, Hyosung Choi, and co-workers demonstrate a random-oriented, but closed-packed organic bulk heterojunction structure realized by solvent selection and composi…
View article: Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites
Accelerating materials discovery by high-throughput GIWAXS characterization of quasi-2D formamidinium metal halide perovskites Open
The intriguing functionalities of emerging quasi-two-dimensional (2D) metal halide perovskites (MHPs) have led to further exploration of this material class for sustainable and scalable optoelectronic applications. However, the chemical co…