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Realizing High Thermoelectric Performance in n-Type Se-Free Bi_(2)Te_(3)Materials by Spontaneous Incorporation of FeTe_(2)nanoinclusions

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Energy & Environmental Materials 2024年第4期7卷 344-354页

作者： Jamil Ur Rahman Woo Hyun Nam Yong-Jae Jung Jong Ho Won Jong-Min Oh Nguyen Van Du Gul Rahman Víctor M.García-Suárez Ran He Kornelius Nielsch Jung Young Cho Won-Seon Seo Jong Wook Roh Sang-il Kim Soonil Lee Kyu Hyoung Lee Hyun Sik Kim Weon Ho Shin Leibniz Institute for Solid State and Materials Research Dresden 01069Germany Advanced Materials Convergence R&D Division Korea Institute of Ceramic Engineering&TechnologyJinju 52861South Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897South Korea Department of Energy Engineering Dankook UniversityCheonan 31116South Korea Faculty of Fundamental Science Phenikaa UniversityHanoi 10000Vietnam Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan Departamento de FAısica Universidad de OviedoOviedo 33007Spain Nanomaterials and Nanotechnology Research Center-CINN El Entrego 33940Spain Department of Materials Science and Engineering Yonsei UniversitySeoul 03722South Korea School of Nano&Materials Science and Engineering Kyungpook National UniversitySangju 37224South Korea Department of Materials Science and Engineering University of SeoulSeoul 02504South Korea School of Materials Science and Engineering Changwon National UniversityChangwon 51140South Korea

Bi_(2)Te_(3)-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room ***,the stability of existing n-type Bi_(2)(Te,Se)_(3)materials is still low due to the evaporation energy of Se(37.70 kJ mol^(-1))being much lower than that of Te(52.55 kJ mol^(-1)).The evaporated Se from the material causes problems in interconnects of the module while degrading the ***,we have developed a new approach for the high-performance and stable n-type Se-free Bi_(2)Te_(3)-based materials bymaximizing the electronic transport while suppressing the phonon transport,at the same *** generated FeTe_(2)nanoinclusions within the matrix during the melt-spinning and subsequent spark plasma sintering is the key to simultaneous engineering of the power factor and lattice thermal *** nanoinclusions change the fermi level of the matrix while intensifying the phonon scattering via *** a fine-tuning of the fermi level with Cu doping in the n-type Bi_(2)Te_(3)-0.02FeTe_(2),a high power factor of∼41×10^(-4)Wm^(-1)K^(-2)with an average zT of 1.01 at the temperature range 300-470 K are achieved,which are comparable to those obtained in n-type Bi_(2)(Te,Se)_(3)*** proposed approach enables the fabrication of high-performance n-type Bi_(2)Te_(3)-based materials without having to include volatile Se element,which guarantees the stability of the ***,widespread application of thermoelectric devices utilizing the n-type Bi_(2)Te_(3)-based materials will become possible.

关键词： Bi_(2)Te_(3) energy harvesting FeTe_(2) nanoinclusion n-type materials thermoelectric

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Writing nanometer-scale structures for centimeter-scale color printing

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Advanced Photonics 2023年第3期5卷 23-24页

作者： Younghwan Yang Trevon Badloe Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Graduate School of Artificial IntelligencePohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Structural coloration,the production of color with nanoscale structures,has steadily gained attention owing to numerous advantages such as environmental friendliness,long-term durability,and vivid coloration compared to conventional chemical pigments.1–3 In addition,recent de-velopments in the field of nanofabrication have led to an increase in research on structural coloration with sophisticated artificial materials,known as metamaterials.

关键词： printing durability gained

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Examining the Impact of Expression Fragmentation and Number Redundancy on Financial QA task

Examining the Impact of Expression Fragmentation and Number ...

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2025 IEEE International Conference on Big Data and Smart Computing, BigComp 2025

作者： Lee, Yoonjae Ki, Kyung Seo Gweon, Gahgene Kim, Bugeun Seoul National University Graduate School of Convergence Science and Technology Korea Republic of Seoul National University Interdisciplinary Program in Artificial Intelligence Korea Republic of Chung-Ang University Department of AI Korea Republic of

The goal of financial QA is to generate solution equations by solving problems about financial reports. Current financial QA models can suffer from two issues: expression fragmentation and number redundancy. We conduct experiments to examine the impact of the two issues. The experimental results show that addressing the expression fragmentation issue in financial QA using EPT improves the execution accuracy by 0.09, and alleviating the number redundancy issue by removing redundant numbers in the input of the FinQANet generator improves the execution accuracy by 0.07. © 2025 IEEE.

关键词： Carrier sense multiple access

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Examining the Impact of Expression Fragmentation and Number Redundancy on Financial QA task

Examining the Impact of Expression Fragmentation and Number ...

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International Conference on Big Data and Smart Computing (BIGCOMP)

作者： Yoonjae Lee Kyung Seo Ki Gahgene Gweon Bugeun Kim Graduate School of Convergence Science and Technology Seoul National University South Korea Interdisciplinary Program in Artificial Intelligence Seoul National University South Korea Department of AI Chung-Ang University South Korea

ISBN: (数字)9798331529024

ISBN: (纸本)9798331529031

关键词： Accuracy Computational modeling Redundancy Big Data Mathematical models Generators

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Wearable and stretchable conductive polymer composites for strain sensors:How to design a superior one?

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nano Materials science 2023年第4期5卷 392-403页

作者： Liwei Lin Sumin Park Yuri Kim Minjun Bae Jeongyeon Lee Wang Zhang Jiefeng Gao Sun Ha Paek Yuanzhe Piao Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul08826South Korea Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalHypoxia/Ischemia Disease InstituteCancer Research InstituteSeoul National University College of MedicineSeoul03080South Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhouJiangsu225002China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHung HomHong Kong SAR999077China Advanced Institutes of Convergence Technology 145 Gwanggyo-roYeongtong-guSuwon-siGyeonggi-do443-270South Korea

Wearable and stretchable strain sensors have potential values in the fields of human motion and health monitoring,flexible electronics,and soft robotic *** wearable and stretchable strain sensors can be directly attached to human skin,providing visualized detection for human motions and personal *** polymer composites(CPC)composed of conductive fillers and flexible polymers have the advantages of high stretchability,good flexibility,superior durability,which can be used to prepare flexible strain sensors with large working strain and outstanding *** review has put forward a comprehensive summary on the fabrication methods,advanced mechanisms and strain sensing abilities of CPC strain sensors reported in recent years,especially the sensors with superior ***,the structural design,bionic function,integration technology and further application of CPC strain sensors are prospected.

关键词： Wearable strain sensors Conductive polymer composites Mechanism Sensing performance

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Batch growth of wafer-scale nanocrystalline NbSe_(2)film for surface-enhanced Raman spectroscopy

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National science Open 2025年第2期4卷 219-232页

作者： Huihui Lin Yiwen Li Yuxin Li Meng-Xuan Li Luyan Wu Zhaolong Chen Jing Li Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)Singapore 627833Singapore National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China State Key Laboratory of Flexible Electronics(LoFE) Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)School of Materials Science and EngineeringNanjing University of Posts and TelecommunicationsNanjing 210023China Guangdong Provincial Key Laboratory of Nano-Micro Materials Research School of Advanced MaterialsPeking University Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Noble metal-based surface-enhanced Raman spectroscopy(SERS)has emerged as an ultrasensitive technique capable of detecting single molecules through their unique vibrational ***,achieving robust SERS nano-materials that combine significant enhancement factors,scalable reproducibility,and superior chemical stability remains a significant *** present an oxygen-free vapor deposition technique for wafer-scale fabrication of nanocrystalline NbSe_(2)(NC-NbSe_(2))films on SiO2/Si substrates,which is compatible with batch *** NC-NbSe_(2)films exhibit remarkable chemical stability across both crystalline domains(average size~8.1 nm)and grain *** stability,combined with enhanced surface adsorption and a high density of states near the Fermi level,enables superior SERS *** 6G detection demonstrates a sensitivity of 1×10^(-10)M,comparable to noble metal-based SERS ***,the NC-NbSe_(2)film maintains stable SERS signals under harsh thermal and chemical *** scalable approach enables the creation of uniform,reproducible SERS atomic thin film,advancing applications in microelectronics and sensing technologies.

关键词： NbSe_(2) metallic transition-metal dichalcogenides surface-enhanced Raman scattering(SERS) wafer-scale growth molecular sensing

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Thermoluminescence Studies of Pakistani Limestone Pellets for X-Rays: Comparison with Commercial Tld-100 Dosimeter

SSRN

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SSRN 2023年

作者： Mahmood, M. Masood Kakakhel, M. Basim Lee, Junyoung Mirza, Jamal Ahmed Millers, Rodrigo Hernandez Ye, Sung-Joon Islamabad45650 Pakistan Health Physics Division PINSTECH Nilore Islamabad Pakistan Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Isotope Production Division Pakistan Institute of Nuclear Science and Technology Nilore Islamabad44000 Pakistan Research Institute for Convergence Science Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Advance Institutes of Convergence Technology Seoul National University Suwon16229 Korea Republic of

With the increased use of ionizing radiations across a spectrum of applications, the quest for identifying low-cost thermoluminescence (TL) materials to be used for radiation dosimetry is of vital importance. Therefore, identification and confirmation of natural materials suitable for radiation dosimetry is an active area of research. Such potential materials must have features like rigidity, insolubility, and chemical inertness etc. besides having additional dosimetric characteristics. One such promising low-cost material can be a limestone having vast deposits in Pakistan. So far, the TL and dosimetric characterization of pellets fabricated with Pakistani limestone and irradiated with X-rays has not been previously reported. All the studied literature has reported powdered form of limestone. The present study reports pelletized limestone and its intercomparison with *** quarried crystalline samples of limestone were hand crushed, sieved and compressed to fabricate pellets of size comparable to standard TLD chips. TL response, kinetic parameters, dose linearity, batch homogeneity, individual sensitivity correction factor (i.e., elemental correction coefficient ECC), lowest detectable dose limit (LDDL), coefficient of variation (COV), energy dependency (for X-ray energy range from 50 kV to 6 MV), and response fading (for a month) were determined and compared with TLD-100. For TL analysis, pellets were irradiated to 250 kV X-rays with a dose of 8 Gy. The pellets exhibited complex TL glow curve showing four peaks (P1, P2, P3 and P4) with a peak temperature of around P1 (90–110°C), P2 (130–170°C), P3 (240–280°C) and P4 (320–350°C) respectively. A dose linearity (with 250 kV X-rays) for 1–10 Gy, was observed while comparing with TLD-100. The pellets showed a linearity while TLD-100 showed supra-linearity in the studied dose range. Tm-Tstop method was applied initially for TL analysis to identify the overlapping peaks of the glow curve followed by Computerized gl

关键词： Thermoluminescence

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Cascaded metasurfaces enabling adaptive aberration corrections for focus scanning

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Opto-Electronic Advances 2024年第10期7卷 28-39页

作者： Xiaotong Li Xiaodong Cai Chang Liu Yeseul Kim Trevon Badloe Huanhuan Liu Junsuk Rho Shiyi Xiao Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200240China Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea.

Scanning focused light with corrected aberrations holds great importance in high-precision optical ***,conventional optical systems,relying on additional dynamical correctors to eliminate scanning aberrations,inevitably result in undesired bulkiness and *** this paper,we propose achieving adaptive aberration corrections coordinated with focus scanning by rotating only two cascaded transmissive *** metasurface is carefully designed by searching for optimal phase-profile parameters of three coherently worked phase functions,allowing flexible control of both the longitudinal and lateral focal position to scan on any custom-designed curved *** proof-ofconcept,we engineer and fabricate two all-silicon terahertz meta-devices capable of scanning the focal spot with adaptively corrected *** results demonstrate that the first one dynamically scans the focal spot on a planar surface,achieving an average scanning aberration of 1.18%within the scanning range of±30°.Meanwhile,the second meta-device scans two focal points on a planar surface and a conical surface with 2.5%and 4.6%scanning aberrations,*** work pioneers a breakthrough pathway enabling the development of high-precision yet compact optical devices across various practical domains.

关键词： terahertz focus scanning aberration correction dielectric metasurface

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Accuracy Enhancement of L-Band EPR Tooth Dosimetry by Implementing Multiple Harmonic Detection

SSRN

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SSRN 2024年

作者： Oh, Jeonghun Koo, Chang Uk Park, Jong In Choi, Kwon Lee, Junyoung Hirata, Hiroshi Ye, Sung-Joon Program in Biomedical Radiation Sciences Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Ionizing Radiation Metrology Group Korea Research Institute of Standards and Science Daejeon34113 Korea Republic of Research Institute for Convergence Science Seoul National University Seoul08826 Korea Republic of Division of Bioengineering and Bioinformatics Faculty of Information Science and Technology Hokkaido University Sapporo060–0814 Japan Department of Applied Bioengineering Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Advanced Institute of Convergence Technology Seoul National University Suwon16629 Korea Republic of Biomedical Research Institute Seoul National University Hospital Seoul03080 Korea Republic of

In a large-scale radiation accident, the swift classification of individuals exposed to high levels of radiation is crucial to minimize casualties. In-vivo tooth dosimetry using L-band electron paramagnetic resonance (EPR) spectroscopy is a promising method for this purpose, as it can estimate individual exposure levels rapidly and non-invasively. However, the accuracy of dose estimation associated with this technique remains a great challenge. To enhance the accuracy, digital multiple harmonic detection (MHD) was incorporated into a home-built L-band EPR spectrometer. This approach enabled the utilization of information present in higher harmonics of EPR signals, which has been often discarded in traditional EPR spectroscopy. Acquired multiple harmonic spectra were reconstructed to the first derivative spectrum to merge information and mitigate the signal broadening. The modulation amplitude varied in a range of 0.3 to 0.7 mT to maximize the accuracy. In a 0.5-minute measurement at 0.6 mT, the standard error of inverse prediction (SEIP) was reduced to 0.57 Gy from 0.71 Gy. The statistical significancy of the enhancement was validated. In conclusion, the accuracy enhanced by this MHD can contribute to improving the efficiency of triage systems in the aftermath of a mass radiation accident. © 2024, The Authors. All rights reserved.

关键词： Paramagnetic resonance

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Inkjet-Printing Controlled Phase Evolution Boosts the Efficiency of Hole Transport Material Free and Carbon-Based CsPbBr_(3) Perovskite Solar Cells Exceeding 9%

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Energy & Environmental Materials 2024年第2期7卷 209-220页

作者： Lihua Zhang Shi Chen Jie Zeng Zhengyan Jiang Qian Ai Xianfu Zhang Bihua Hu Xingzhu Wang Shihe Yang Baomin Xu Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry The Hong Kong University of Science and TechnologyClear Water BayHong KongChina Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifeng 475004China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

Hole transport material free carbon-based all-inorganic CsPbBr_(3)perovskite solar cells(PSCs)are promising for commercialization due to its low-cost,high open-circuit voltage(V_(oc))and superior *** to the different solubility of PbBr_(2)and CsBr in conventional solvents,CsPbBr_(3)films are mainly obtained by multi-step spin-coating through the phase evolution from PbBr_(2)to CsPb_(2)Br_(5)and then to CsPbBr_(3).The scalable fabrication of high-quality CsPbBr_(3)films has been rarely ***,an inkjet-printing method is developed to prepare high-quality CsPbBr_(3)*** formation of long-range crystalline CsPb_(2)Br_(5)phase can effectively improve phase purity and promote regular crystal stacking of CsPbBr_(3).Consequently,the inkjet-printed CsPbBr_(3)C-PSCs realized PCEs up to 9.09%,8.59%and 7.81%with active areas of 0.09,0.25,and 1 cm^(2),respectively,demonstrating the upscaling potential of our fabrication method and *** high performance is mainly ascribed to the high purity,strong crystal orientation,reduced surface roughness and lower trap states density of the as-printed CsPbBr_(3)*** work provides insights into the relationship between the phase evolution mechanisms and crystal growth dynamics of cesium lead bromide halide films.

关键词： all-inorganic perovskite solar cells CsPbBr_(3) inkjet-printing phase evolution

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