Nam‐Gyu Park
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View article: Halide Perovskite Radiation Detectors: Conventional Imaging Applications and New Opportunities
Halide Perovskite Radiation Detectors: Conventional Imaging Applications and New Opportunities Open
Organic–inorganic hybrid halide perovskites (OIHPs) semiconductors with outstanding optoelectronic properties have attracted significant attention as next‐generation integrated radiation detectors for medical radiodiagnosis and healthcare …
View article: Perovskite‐Inspired Materials (PIMs): Exploring Their Potential for Photovoltaic Applications
Perovskite‐Inspired Materials (PIMs): Exploring Their Potential for Photovoltaic Applications Open
Perovskite‐inspired materials (PIMs) have been investigated as alternatives to organic lead halide perovskites in order to explore novel lead‐free materials for photovoltaics. This review describes the structural and optoelectronic propert…
View article: Spontaneous formation of robust two-dimensional perovskite phases
Spontaneous formation of robust two-dimensional perovskite phases Open
The two-dimensional on three-dimensional (2D/3D) perovskite bilayer heterostructure can improve the stability and performance of perovskite solar cells. We show that the 2D/3D perovskite stack in a device evolves dynamically during its end…
View article: Triple‐Additive Strategy for Enhanced Material and Device Stability in Perovskite Solar Cells
Triple‐Additive Strategy for Enhanced Material and Device Stability in Perovskite Solar Cells Open
The stability of the FAPbI 3 perovskite phase is significantly affected by internal strain. In this report, additives in the perovskite precursor solution are designed to prevent local lattice mismatch of the resulting perovskite layer. In…
View article: Influence of light quality on the profiling of metabolites and the status of Lactobacillus community in the phyllosphere of hydroponically grown ginseng
Influence of light quality on the profiling of metabolites and the status of Lactobacillus community in the phyllosphere of hydroponically grown ginseng Open
Background The microbial community within the phyllosphere plays a critical role in plant health and growth by facilitating nutrient uptake, inducing resistance and enhancing tolrance to stress. Environmental factors, such as light intensi…
View article: Materials and methods for cost-effective fabrication of perovskite photovoltaic devices
Materials and methods for cost-effective fabrication of perovskite photovoltaic devices Open
Although perovskite solar cells (PSCs) are promising next generation photovoltaics, the production of PSCs might be hampered by complex and inefficient procedures. This Review outlines important advances in materials and methods for the co…
View article: High‐performance 110 <scp>kVp</scp> hard x‐ray detector based on all‐crystalline‐surface passivated perovskite single crystals
High‐performance 110 <span>kVp</span> hard x‐ray detector based on all‐crystalline‐surface passivated perovskite single crystals Open
Halide perovskite single crystals (SCs) have attracted much attention for their application in high‐performance x‐ray detectors owing to their desirable properties, including low defect density, high mobility–lifetime product ( μτ ), and l…
View article: Substituent engineering in tertiary phosphine oxides for passivating defects of perovskite solar cells
Substituent engineering in tertiary phosphine oxides for passivating defects of perovskite solar cells Open
Defect passivation based on Lewis acid–base chemistry has been regarded as an effective strategy to improve the photovoltaic performance and stability of perovskite solar cells (PSCs). Here, we report on tertiary phosphine oxides (R 3 PO) …
View article: A computational framework for drop time assessment of a control element assembly under fuel assembly deformations with fluid-structure interaction and frictional contact
A computational framework for drop time assessment of a control element assembly under fuel assembly deformations with fluid-structure interaction and frictional contact Open
This paper presents a computational framework for drop time assessment of a control element assembly (CEA) under fuel assembly (FA) deformations. The proposed framework consists of three key components: 1) finite element modeling of CEA, 2…
View article: Soft Lattice and Phase Stability of α‐FAPbI<sub>3</sub>
Soft Lattice and Phase Stability of α‐FAPbI<sub>3</sub> Open
Since the certified power conversion efficiency (PCE) of perovskite solar cells (PSCs) has reached 26.1%, exactly equal to that of crystalline silicon solar cells, a strong demand for ensuring the long‐term stability of PSCs has arisen for…
View article: NiO as Hole Transporting Layer for Inverted Perovskite Solar Cells: A Study of X‐Ray Photoelectron Spectroscopy (Adv. Mater. Interfaces 8/2024)
NiO as Hole Transporting Layer for Inverted Perovskite Solar Cells: A Study of X‐Ray Photoelectron Spectroscopy (Adv. Mater. Interfaces 8/2024) Open
Nickel Oxide In article 2300751, Nam-Gyu Park, Hyunjung Shin, and co-workers show that the Ni2p XPS shoulder peak is vital for evaluating p-type semiconductor behavior, especially in perovskite solar cells using it as hole-transporting mat…
View article: From non‐doped to dopable: The impact of methoxy functionalization on doping and thermoelectric properties of conjugated polymers
From non‐doped to dopable: The impact of methoxy functionalization on doping and thermoelectric properties of conjugated polymers Open
The introduction of alkoxy side chains into the backbone of conjugated polymers is an effective way to change their properties. While the impact on the structure and optoelectronic properties of polymer thin films was well‐studied in organ…
View article: Reducing Hole Trap Density in Sn–Pb Perovskite Solar Cells via Molecular Phenylhydrazine
Reducing Hole Trap Density in Sn–Pb Perovskite Solar Cells via Molecular Phenylhydrazine Open
Narrow‐bandgap Sn–Pb‐alloyed perovskite is potential for a bottom cell in perovskite tandem solar cells. However, Sn‐contained perovskites tend to be readily oxidized in air atmosphere, which has ill influence on stability and photovoltaic…
View article: NiO as Hole Transporting Layer for Inverted Perovskite Solar Cells: A Study of X‐Ray Photoelectron Spectroscopy
NiO as Hole Transporting Layer for Inverted Perovskite Solar Cells: A Study of X‐Ray Photoelectron Spectroscopy Open
Hygroscopic and acidic nature of organic hole transport layers (HTLs) insisted to replace it with metal oxide semiconductors due to their favorable charge carrier transport with long chemical stability. Apart from large direct bandgap and …
View article: All-perovskite tandem solar cells: from fundamentals to technological progress
All-perovskite tandem solar cells: from fundamentals to technological progress Open
This review provides fundamental knowledge and development directions towards the commercialising of advantageous all-perovskite tandem solar cells.
View article: Atmospheric Humidity Underlies Irreproducibility of Formamidinium Lead Iodide Perovskites
Atmospheric Humidity Underlies Irreproducibility of Formamidinium Lead Iodide Perovskites Open
Metal halide perovskite solar cells (PSCs) are infamous for their batch‐to‐batch and lab‐to‐lab irreproducibility in terms of stability and performance. Reproducible fabrication of PSCs is a critical requirement for market viability and pr…
View article: Low-dimensional Lead-free Halide Perovskites for Resistive Switching Memory Devices
Low-dimensional Lead-free Halide Perovskites for Resistive Switching Memory Devices Open
presented at the '#OPTMS - Organic and Perovskite-Based Transistor Memristors and Synapses' symposium during the Materials for Sustainable Development Conference, MATSUS Spring 2024 Conference (MATSUS24). Accepted for an oral presentation …
View article: Homogenizing out-of-plane cation composition in perovskite solar cells
Homogenizing out-of-plane cation composition in perovskite solar cells Open
Perovskite solar cells with the formula FA 1− x Cs x PbI 3 , where FA is formamidinium, provide an attractive option for integrating high efficiency, durable stability and compatibility with scaled-up fabrication. Despite the incorporation…
View article: Progress and issues in p-i-n type perovskite solar cells
Progress and issues in p-i-n type perovskite solar cells Open
P-i-n type perovskite solar cells (PSCs) manifest some promising advantages in terms of remarkable operational stability, low-temperature processability, and compatibility for multi-junction devices, whereas relatively low efficiency compa…
View article: Lattice engineering for stabilized black FAPbI <sub>3</sub> perovskite single crystals for high-resolution x-ray imaging at the lowest dose
Lattice engineering for stabilized black FAPbI <sub>3</sub> perovskite single crystals for high-resolution x-ray imaging at the lowest dose Open
Preliminary theoretical analyses indicate that lattice relaxation may be used to release lattice strain in the FAPbI 3 perovskite to warrant both high x-ray detection performance and improved stability. Herein, we demonstrate stable black …
View article: Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI<sub>2</sub> Inclusion Formation
Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI<sub>2</sub> Inclusion Formation Open
Excess lead(II) iodide (PbI 2 ) has controversial roles in affecting the efficiency of perovskite solar cells (PSCs). Since the photoinstability of PbI 2 is now known to largely accelerate perovskite degradation, suppressing and/or elimina…
View article: Nanographene Coupled with Interfacial Pyrene Derivatives for Thermally Stable Perovskite Solar Cells
Nanographene Coupled with Interfacial Pyrene Derivatives for Thermally Stable Perovskite Solar Cells Open
Although high-efficiency perovskite solar cells (PSCs) have been achieved using a hole-extracting material, spiro-MeOTAD, thermal stability has been unattainable due to the low glass transition temperature of spiro-MeOTAD and additives the…
View article: Kinetic‐Controlled Crystallization of <i>α</i>‐FAPbI<sub>3</sub> Inducing Preferred Crystallographic Orientation Enhances Photovoltaic Performance
Kinetic‐Controlled Crystallization of <i>α</i>‐FAPbI<sub>3</sub> Inducing Preferred Crystallographic Orientation Enhances Photovoltaic Performance Open
Crystallization kinetic controls the crystallographic orientation, inducing anisotropic properties of the materials. As a result, preferential orientation with advanced optoelectronic properties can enhance the photovoltaic devices' perfor…