A5088732187- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Structural Health Monitoring Techniques
- Solid-state spectroscopy and crystallography
- Infrastructure Maintenance and Monitoring
- EFL/ESL Teaching and Learning
- Second Language Acquisition and Learning
- Radiation Detection and Scintillator Technologies
- Quantum Dots Synthesis And Properties
- Fuel Cells and Related Materials
- Anaerobic Digestion and Biogas Production
- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Integrated Circuits and Semiconductor Failure Analysis
- Educational Technology and Assessment
- Membrane-based Ion Separation Techniques
- Geophysical Methods and Applications
- Advanced Semiconductor Detectors and Materials
- Second Language Learning and Teaching
- Organic Light-Emitting Diodes Research
- Advanced Battery Technologies Research
- 3D IC and TSV technologies
- Technology and Data Analysis
- Radio Astronomy Observations and Technology
Korea Advanced Institute of Science and Technology
2013-2025
Sungkyunkwan University
2018-2023
Ericsson (Canada)
2023
Gachon University
2018-2022
University of Manitoba
2018-2021
Frontier Energy (United States)
2020
Suwon Research Institute
2020
Electronics and Telecommunications Research Institute
2016
Perovskite solar cells with the formula FA1-xCsxPbI3, where FA is formamidinium, provide an attractive option for integrating high efficiency, durable stability and compatibility scaled-up fabrication. Despite incorporation of Cs cations, which could potentially enable a perfect perovskite lattice1,2, compositional inhomogeneity caused by A-site cation segregation likely to be detrimental photovoltaic performance cells3,4. Here we visualized out-of-plane along vertical direction across films...
Abstract Visual inspection has traditionally been used for structural health monitoring. However, assessments conducted by trained inspectors or using contact sensors on structures monitoring are costly and inefficient because of the number required. To date, data acquisition unmanned aerial vehicles (UAVs) equipped with cameras become popular, but UAVs require skilled pilots a global positioning system (GPS) autonomous flight. Unfortunately, GPS cannot be UAV flight near some parts certain...
A myriad of studies and strategies have already been devoted to improving the stability perovskite films; however, role different crystal facets in is still unknown. Here, we reveal underlying mechanisms facet-dependent degradation formamidinium lead iodide (FAPbI3) films. We show that (100) facet substantially more vulnerable moisture-induced than (111) facet. With combined experimental theoretical studies, are revealed; a strong water adhesion following an elongated lead-iodine (Pb-I) bond...
Understanding the interplay between surface structure and passivation materials their effects associated with modification is of fundamental importance; however, it remains an unsolved problem in perovskite field. Here, we report a principle for efficient solar cells via facet-dependent phenomenon. The process selectively occurs on facets, which observed various post-treatment different functionality, atomic arrangements facets determine alignments layers. profound understanding leads to...
Post-treatement of an unannealed perovskite film is found to be more efficienct way passivate defects solar cells.
In today’s world, renewable energy sources are increasingly integrated with nonrenewable into electric grids and pose new challenges because of their intermittent variable nature. Energy prediction using soft-computing techniques plays a vital role in addressing these challenges. As electricity consumption is closely linked to other such as natural gas oil, forecasting essential for making national policies. this paper, we utilize various data mining techniques, including preprocessing...
Methylammonium chloride (MACl) has been used as an additive in a formamidinium lead iodide (FAPbI3) precursor solution for high-efficiency perovskite solar cells (PCSs), where the ion is known to have positive effect on photovoltaic performance. However, we found that residual film adverse device stability. Here, report improved stability of PSCs by elimination via postheat-treatment (PHT). Removal MACl grain surface accompanied conversion FAPbI3 PbI2. Compared with control film, PHT-induced...
This paper proposes a framework for obstacle-avoiding autonomous unmanned aerial vehicle (UAV) systems with new obstacle avoidance method (OAM) and localization UAVs structural health monitoring (SHM) in GPS-denied areas. There are high possibilities of obstacles the planned trajectory used purposes. A traditional UAV an ultrasonic beacon is limited to scope vulnerable both depleted battery environmental electromagnetic fields. To overcome these critical problems, deep learning-based OAM...
Chemical bath-deposited SnO 2 widely used as an electron transport layer has hydroxyl defect, which is responsible for degradation of perovskite solar cell. Surface passivation with 4-fluorothiophenol improves stability.
Surface passivation of perovskite grains is one the promising methods to reduce recombination and improve stability solar cells (PSCs). We herein report effect a melaminium iodide additive on photovoltaic performance PSCs based (FAPbI3)0.875(CsPbBr3)0.125 perovskite. Cyclic -C═N- primary amine in melamine are good hydrogen bond acceptor Lewis base, which can interact with both organic cation acidic lead film. Melaminium synthesized added precursor solution, directly spin-coated form The...
At present, perovskite light-emitting diodes are mostly based on various forms of nanostructures exploiting their exciton confinement property. However, the few reports utilizing bulk or polycrystalline perovskites have been limited in application because difficulties forming high-quality films, especially existing organic charge transport layers. When these organics exchanged with thicker CH3NH3PbCl3, emitting CsPbBr3 thick films containing CH3NH3Br conformally deposited improved...
Povidone, also know as polyvinylpyrrolidone (PVP), is used a reservoir for iodine, and the povidone-iodine (PVP-I) complex has antiseptic properties wound healing by releasing iodine. In this report, we utilized unique characteristic of PVP-I to heal photovoltaic parameters perovskite solar cells (PSCs). was added in precursor solution, where effect concentration on performance investigated. The power conversion efficiency (PCE) PSC enhanced from 20.73% 22.59% addition 0.1 mg/mL PVP-I,...
Functional groups (ammonium versus amidinium and aryl alkyl) of passivating materials play a critical role in the surface passivation perovskite films.
Controlling the Fermi level of semiconductors underlies most electronic and photovoltaic technologies. However, it remains limited to continuously tune doping levels intensively studied lead halide perovskite by introducing any impurities or functional molecules. Here, we report a nonchemical charge transfer approach for continuous tuning work function (WF) perovskite. A modification surface WF from 4.18 5.05 eV is achieved applying bias voltage varying its polarity on formamidinium...
For 2-d X-ray imaging, such as mammography and non-destructive test, a sensor should have large-area because the for typical beams cannot use optical lens system. To make image using crystal Si, technique of tiling unit CMOS sensors into 2 × or 3 array can be used. In made most common 8-inch Si wafers, signal line up to ∼ 180 mm long. Then its parasitic capacitance is 25 pF resistance 51 kΩ (0.18 μm, 1P3M process). This long may enlarge row time 50 μsec in case from top pixels readout...
Civil infrastructure is important to ensure the ongoing functionality of human living environments. However, in North America, much aging and requires continuous monitoring maintenance safety people. Traditionally, visual inspection has been carried out monitor health such structures. assessments require trained inspectors, methods are difficult due size location infrastructure. Recently, data acquisition using unmanned aerial vehicles (UAVs) equipped with cameras growing popularity,...
A nanofiber mat of styrene−co−vinylbenzyl chloride−co−acrylonitrile copolymer as an anion exchange membrane (AEM) was synthesized via the electrospinning organic reaction mixtures. The membranes were characterized using FT-IR spectroscopy for structural analysis. AEM demonstrated a high ionic conductivity mainly due to phase segregation in structure, analyzed by transmission electron microscopy (TEM). properties such water uptake, swelling ratio, and ion capacity, well conductivity, varied...
Recently, targeted attacks are increased against industrial control system facilities. In order to protect these facilities from attacks, defence-in-depth strategy can be applied systems. It separates network and business network, uses a one-way data transmission technology for transfer between higher security area lower area. But most of the current unidirectional gateway is just only without considering reliability security. this paper, guarantee transmitted data, we design system, UNIWAY,...