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Enhancing the efficiency and scalability of perovskite solar cells through pseudo-halide salt addition

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Journal of materials Science & Technology 2023年第34期165卷 161-169页

作者： Dohun Baek Geon Yeong Park Jeongbeom Cha Hyemi Na Dong Seok ham min Kim School of Chemical Engineering Future Energy Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Graduate School of Integrated Energy-AI Jeonbuk National UniversityJeonju 54896Republic of Korea Chemical materials Solutions Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea

Organic-inorganic halide perovskites have significant potential for application in next-generation solar ***,their applications are limited by challenges associated with large-area processability and long-term stability owing to the presence of pinholes and defect ***,we incorporated cesium formate in a perovskite active layer using a sequential perovskite fabrication process to eliminate the defect sites of perovskites and improve the film processability via roll-to-roll(R2R)*** addition of cesium formate salt to the PbI2 layer influences the perovskite crystal formation behavior as well as increases the perovskite crystallinity and decreases the defect ***,cesium formate addition eliminated small PbI2 grains and smoothed the perovskite surface,resulting in a large crystal grain *** formate ions interact with the PbI2 component and passivate halide vacancy defects,reducing nonradiative recombination and improving charge ***,the treated perovskite films were highly stable in air,exhibiting improved efficiency retention over time and achieving a power conversion efficiency(PCE)of>22%compared to the ***,the additive-treated perovskite film was processed using the R2R method,achieving a high PCE of>14%with minimal hysteresis.

关键词： Perovskite Solar Cells Pseudo-halide ion Stability Roll-to-roll process

Slow Pyrolysis of Sugarcane Bagasse for the Production of Char and the Potential of Its By-Product for Wood Protection

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Journal of Renewable materials 2021年第1期9卷 97-117页

作者： Febrina Dellarose Boer Jérémy Valette Jean-michel Commandré mériem Fournier marie-France Thévenon CIRAD UR BioWooEBTA B-114/1673 Rue Jean-François BretonF-34398 MontpellierCedex 5France BioWooEB Universitéde MontpellierCIRADMontpellierFrance AgroParisTech Centre de Nancy Nancy54000France Universitéde Lorraine AgroParisTechINRAUMR SilvaNancyF-54000France

Sugarcane bagasse was pyrolyzed using a laboratory fixed bed reactor to produce char and its by-product(pyrolysis liquid).The pyrolysis experiments were carried out using different temperatures(400℃ and 500℃),heating rate(1℃/min and 10℃/min),and holding time(30 min and 60 min).Char was characterized according to its thermal properties,while the pyrolysis liquid was tested for its anti-fungal and anti-termite *** temperature and heating rate had a significant influence on the char properties and the yield of char and pyrolysis liquid,where a high-quality char and high yield of pyrolysis liquid can be obtained at a temperature of 500℃ and a heating rate of 10℃/*** yield of char and pyrolysis liquid was 28.97%and 55.46%,*** principal compounds of pyrolysis liquid were water,acetic acid,glycolaldehyde,1-hydroxy-2-propanone,methanol,formic acid,levoglucosan,furfural,followed by some phenol compounds and guaiacol *** liquid at a concentration of 0.20%and 0.25%(v/v)caused a 100%inhibition of Coniophora puteana and Trametes versicolor,respectively,when performing inhibition growth tests in Petri *** paper treated with 10%of pyrolysis liquid caused 100%of termite mortality,while only 5.65%–7.03%of the treated filter papers consumed by termites at such *** liquid is potentially effective to be used in the formulation of wood protection against fungi and termites.

关键词： Anti-fungal anti-termite biomass char pyrolysis liquid slow pyrolysis sugarcane bagasse valorization

The distinct morphological phenotypes of Southeast Asian aborigines are shaped by novel mechanisms for adaptation to tropical rainforests

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National Science Review 2022年第3期9卷 85-95页

作者： Xiaoming Zhang Qi Liu Hui Zhang Shilei Zhao Jiahui Huang Tuot Sovannary Long Bunnath Hong Seang Aun ham Samnom Bing Su Hua Chen State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Center for Excellence in Animal Evolution and Genetics Chinese Academy of Sciences CAS Key Laboratory of Genomic and Precision medicine Beijing Institute of GenomicsChinese Academy of Sciences China National Center for Bioinformation School of Future Technology and Sino-Danish College University of Chinese Academy of Sciences Kunming College of Life Science University of Chinese Academy of Sciences Department of Geography and Land management Royal University of Phnom Penh Capacity Development Facilitator for Handicap International Federation and Freelance Research

Southeast Asian aborigines, the hunter-gatherer populations living in tropical rainforests, exhibit distinct morphological phenotypes, including short stature, dark skin, curly hair and a wide and snub nose. The underlying genetic architecture and evolutionary mechanism of these phenotypes remain a long-term mystery. We conducted whole genome deep sequencing of 81 Cambodian aborigines from eight ethnic groups. Through a genome-wide scan of selective sweeps, we discovered key genes harboring Cambodian-enriched mutations that may contribute to their phenotypes, including two hair morphogenesis genes(TCHH and TCHHL1), one nasal morphology gene(PAX3) and a set of genes(such as ENTPD1-AS1) associated with short stature. The identified new genes and novel mutations suggest an independent origin of the distinct phenotypes in Cambodian aborigines through parallel evolution, refuting the long-standing argument on the common ancestry of these phenotypes among the worldwide rainforest hunter-gatherers. Notably, our discovery reveals that various types of molecular mechanisms, including antisense transcription and epigenetic regulation, contribute to human morphogenesis, providing novel insights into the genetics of human environmental adaptation.

关键词： Cambodian aborigines environmental adaptation genomic polymorphism morphogenesis parallel evolution positive selection

Deep learning acceleration of multiscale superresolution localization photoacoustic imaging

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Light(Science & Applications) 2022年第6期11卷 1166-1177页

作者： Jongbeom Kim Gyuwon Kim Lei Li Pengfei Zhang Jin Young Kim Yeonggeun Kim Hyung ham Kkim Lihong V.Wang Seungchul Lee Chulhong Kim Departments of Electrical Engineering Mechanical EngineeringConvergence IT Engineeringand Interdisciplinary Bioscience and BioengineeringGraduate School of Artificial IntelligenceMedical Device Innovation CenterPohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohangGyeongbuk 37673Republic of Korea Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 E.California Blvd.MC 138-78PasadenaCA 91125USA School of Precision Instruments and Optoelectronics Engineering Tianjin University92 Weijin RoadNankai DistrictTianjin 300072China Opticho 532CHANGeUP GROUND87 Cheongam-roNam-guPohangGyeongsangbuk 37673Republic of Korea

A superresolution imaging approach that localizes very small targets,such as red blood cells or droplets of injected photoacoustic dye,has significantly improved spatial resolution in various biological and medical imaging ***,this superior spatial resolution is achieved by sacrificing temporal resolution because many raw image frames,each containing the localization target,must be superimposed to form a sufficiently sampled high-density superresolution ***,we demonstrate a computational strategy based on deep neural networks(DNNs)to reconstruct high-density superresolution images from far fewer raw image *** localization strategy can be applied for both 3D label-free localization optical-resolution photoacoustic microscopy(OR-PAm)and 2D labeled localization photoacoustic computed tomography(PACT).For the former,the required number of raw volumetric frames is reduced from tens to fewer than *** the latter,the required number of raw 2D frames is reduced by 12 ***,our proposed method has simultaneously improved temporal(via the DNN)and spatial(via the localization method)resolutions in both label-free microscopy and labeled ***-learning powered localization PA imaging can potentially provide a practical tool in preclinical and clinical studies requiring fast temporal and fine spatial resolutions.

关键词： Deep frames networks

Embedded software and hardware implementation system for a human machine interface based on ISOAgLib

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第3期14卷 155-166页

作者： Enkhbaatar TUmENJARGAL Luubaatar BADARCH Hyeokjae KWON Woonchul ham Division of Electronic Engineering Chonbuk National University School of Information and Communication Technology Mongolian University of Science and Technology

modern agricultural machinery demands adoption of embedded electronic and remote sensing technology for precision *** of the electronic devices commonly used is the virtual terminal(VT) for tractors.A VT's functions and terminology are described in the ISO 11783 *** paper presents a control system design and implementation for a VT and some other electronic control units(ECUs) for agricultural vehicles based on that *** and software development for the VT is implemented using the ISOAgLib open library,in the advanced embedded *** main part of the system is an embedded board based on a Samsung S3C6410 ARm11 core microprocessor with a controller area network(CAN) *** working environment is Windows Embedded CE 6.0(WinCE6.0).The ISOAgLib library provides abundant open sources consistent implementation of ISO *** is written in C++ programming language using object-oriented *** this paper,we describe an ISO 11783-based tractor control system with a CAN and its implementation in the embedded *** paper also explains the operation of a CAN-bus device driver in WinCE6.0 and some modifications of ISOAgLib for our target *** target system consists of the VT,an ECU for the global positioning system(GPS),and an ECU for lighting for an agricultural *** ECU for GPS and the ECU of a light controller are implemented using STm32F107F ARm Cortex m3-based development boards.

关键词： Controller area network(CAN)-bus Virtual terminal(VT) Embedded system ISO 11783

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Epileptic seizure detection using EEG signals and extreme gradient boosting

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The Journal of Biomedical Research 2020年第3期34卷 228-239页

作者： Paul Vanabelle Pierre De Handschutter riem El Tahry mohammed Benjelloun mohamed Boukhebouze Data Science Department Centre of Excellence in Informationand Communication TechnologiesCharleroi 6041Belgium Computer Science Unit Faculty of EngineeringUniversity of MonsMons 7000Belgium Refractory Epilepsy Centre University Hospital of Saint-LucBrussels 1200Belgium Institute of Neuroscience Catholic University of LouvainBrussels 1200Belgium

The problem of automated seizure detection is treated using clinical electroencephalograms(EEG) and machine learning algorithms on the Temple University Hospital EEG Seizure Corpus(TUSZ).Performances on this complex data set are still not encountering *** purpose of this work is to determine to what extent the use of larger amount of data can help to improve the *** methods are explored:a standard partitioning on a recent and larger version of the TUSZ,and a leave-one-out approach used to increase the amount of data for the training ***,a fast implementation of the gradient boosting classifier,is the ideal algorithm for these *** performances obtained are in the range of what is reported until now in the literature with deep learning *** give interpretation to our results by identifying the most relevant features and analyzing performances by seizure *** show that generalized seizures tend to be far better predicted than focal *** also notice that some EEG channels and features are more important than others to distinguish seizure from background.

关键词： epileptic seizure electroencephalograms Temple University Hospital EEG Seizure Corpus machine learning XGBoost

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multi-redox phenazine/non-oxidized graphene/cellulose nanohybrids as ultrathick cathodes for high-energy organic batteries

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Nano Research 2021年第5期14卷 1382-1389页

作者： Youngjin ham Vitalii Ri Jin Kim Yeoheung Yoon Jinho Lee Kisuk Kang Ki-Seok An Chunjoong Kim Seokwoo Jeon Department of materials Science and Engineering Advanced Battery CenterKorea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Department of materials Science and Engineering Chungnam National UniversityDaejeon34134Republic of Korea Thin Film materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon34114Republic of Korea Department of materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea

Various redox-active organic molecules can serve as ideal electrode materials to realize sustainable energy storage systems. Yet, to be more appropriate for practical use, considerable architectural engineering of an ultrathick, high-loaded organic electrode with reliable electrochemical performance is of crucial importance. Here, by utilizing the synergetic effect of the non-covalent functionalization of highly conductive non-oxidized graphene flakes (NOGFs) and introduction of mechanically robust cellulose nanofiber (CNF)-intermingled structure, a very thick (≈ 1 mm), freestanding organic nanohybrid electrode which ensures the superiority in cycle stability and areal capacity is reported. The well-developed ion/electron pathways throughout the entire thickness and the enhanced kinetics of electrochemical reactions in the ultrathick 5,10-dihydro-5,10-dimethylphenazine/NOGF/CNF (DmPZ-NC) cathodes lead to the high areal energy of 9.4 mWh·cm−2 (= 864 Wh·kg−1 at 158 W·kg−1). This novel ultrathick electrode architecture provides a general platform for the development of the high-performance organic battery electrodes.

关键词： energy storage organic electrodes batteries graphene cellulose nanofibers

Fundamental principles and development of proximity-field nanopatterning toward advanced 3D nanofabrication

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Nano Research 2021年第9期14卷 2965-2980页

作者： Sang-Hyeon Nam Gayea Hyun Donghwi Cho Seonggon Han Gwangmin Bae Haomin Chen Kisun Kim Youngjin ham Junyong Park Seokwoo Jeon Department of materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of materials Science and Engineering Kumoh National Institute of TechnologyGumiGyeongbuk 39177Republic of Korea Department of Energy Engineering Convergence Kumoh National Institute of TechnologyGumiGyeongbuk 39177Republic of Korea KAIST Institute for NanoCentury(KINC) KAISTDaejeon 34141Republic of Korea

Three-dimensional(3D)nanoarchitectures have offered unprecedented material performances in diverse applications like energy storages,catalysts,electronic,mechanical,and photonic *** outstanding performances are attributed to unusual material properties at the nanoscale,enormous surface areas,a geometrical uniqueness,and comparable feature sizes with optical *** the practical use of the unusual nanoscale properties,there have been developments for macroscale fabrications of the 3D nanoarchitectures with process areas over centimeter *** the many fabrication methods for 3D structures at the nanoscale,proximity-field nanopatterning(PnP)is one of the promising techniques that generates 3D optical holographic images and transforms them into material structures through a lithographic *** conformal and transparent phase masks as a key factor,the PnP process has advantages in terms of stability,uniformity,and reproducibility for 3D nanostructures with periods from 300 nm to several *** merits of realizing precise 3D features with sub-100 nm and rapid processes are attributed to the interference of coherent light diffracted by phase *** this review,to report the overall progress of PnP from 2003,we present a comprehensive understanding of PnP,including its brief history,the fundamental principles,symmetry control of 3D nanoarchitectures,material issues for the phase masks,and the process area expansion to the wafer-scale for the target ***,technical challenges and prospects are discussed for further development and practical applications of the PnP technique.

关键词： proximity-field nanopatterning three-dimensional(3D)nanostructures phase mask interference lithography

Dzyaloshinskii–moriya interaction in noncentrosymmetric superlattices

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npj Computational materials 2021年第1期7卷 1164-1170页

作者： Woo Seung ham Abdul-muizz Pradipto Kay Yakushiji Kwangsu Kim Sonny H.Rhim Kohji Nakamura Yoichi Shiota Sanghoon Kim Teruo Ono Institute for Chemical Research Kyoto UniversityUjiKyotoJapan Department of Physics Engineering Mie UniversityTsuMieJapan Faculty of mathematics and Natural Sciences Institut Teknologi BandungBandungIndonesia National Institute of Advanced Industrial Science and Technology(AIST) TsukubaIbarakiJapan Department of Physics University of UlsanUlsanSouth Korea

Dzyaloshinskii–moriya interaction(DmI)is considered as one of the most important energies for specific chiral textures such as magnetic *** keys of generating DmI are the absence of structural inversion symmetry and exchange energy with spin–orbit ***,a vast majority of research activities about DmI are mainly limited to heavy metal/ferromagnet bilayer systems,only focusing on their ***,we report an asymmetric band formation in a superlattices(SL)which arises from inversion symmetry breaking in stacking order of atomic layers,implying the role of bulk-like *** bulk DmI is more than 300%larger than simple sum of interfacial ***,the asymmetric band is largely affected by strong spin–orbit coupling,showing crucial role of a heavy metal even in the non-interfacial origin of *** work provides more degrees of freedom to design chiral magnets for spintronics applications.

关键词： interaction symmetry chiral