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Alleviating Interfacial Recombination of Heterojunction Electron Transport Layer via Oxygen Vacancy Engineering for Efficient Perovskite Solar Cells Over 23%

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Energy & Environmental Materials 2023年第2期6卷 311-322页

作者： Yohan ko Taemin Kim Chanyong Lee Changhyun Lee Yong Ju yun Yongseok Jun Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Korea

Electron transport layer(ETL)is pivotal to charge carrier transport for PSCs to reach the Shockley-Queisser *** study provides a fundamental understanding of heterojunction electron transport layers(ETLs)at the atomic level for stable and efficient perovskite solar cells(PSCs).The bilayer structure of an ETL composed of SnO_(2) on TiO_(2) was examined,revealing a critical factor limiting its potential to obtain efficient *** of oxygen vacancies in the TiO_(2) underlayer via an annealing process is found to induce manipulated band offsets at the interface between the TiO_(2) and SnO_(2) ***-depth electronic investigations of the bilayer structure elucidate the importance of the electronic properties at the interface between the TiO_(2) and SnO_(2) *** apparent correlation in hysteresis phenomena,including current density-voltage(J-V)curves,appears as a function of the type of band *** functional theory calculations reveal the intimate relationship between oxygen vacancies,deep trap states,and charge transport efficiency at the interface between the TiO_(2) and SnO_(2) *** formation of cascade band alignment via control over the TiO_(2) underlayer enhances device performance and suppresses *** performance exhibits a power conversion efficiency(PCE)of 23.45%with an open-circuit voltage(V_(oc))of 1.184 V,showing better device stability under maximum power point tracking compared with a staggered bilayer under one-sun continuous illumination.

关键词： electron transport bilayer heterojunction bilayers interfacial defect oxygen vacancy engineering perovskite solar cells

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Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

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Nano-Micro Letters 2023年第9期15卷 562-603页

作者： Yeongju Jung Minwoo Kim Taegyeom Kim Jiyong Ahn Jinwoo Lee Seung Hwan ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Mechanical Roboticsand Energy EngineeringDongguk University30 Pildong-ro 1-gilJung-guSeoul 04620South Korea Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National UniversityGwanak-roGwanak-guSeoul 08826South Korea Institute of Engineering Research Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea

Thermal management is essential in our body as it affects various bodily functions,ranging from thermal discomfort to serious organ failures,as an example of the worst-case *** have been extensive studies about wearable materials and devices that augment thermoregulatory functionalities in our body,employing diverse materials and systematic approaches to attaining thermal *** paper reviews the recent progress of functional materials and devices that contribute to thermoregulatory wearables,particularly emphasizing the strategic methodology to regulate body *** exist several methods to promote personal thermal management in a wearable *** instance,we can impede heat transfer using a thermally insulating material with extremely low thermal conductivity or directly cool and heat the skin ***,we classify many studies into two branches,passive and active thermal management modes,which are further subdivided into specific *** from discussing the strategies and their mechanisms,we also identify the weaknesses of each strategy and scrutinize its potential direction that studies should follow to make substantial contributions to future thermal regulatory wearable industries.

关键词： Thermal management Passive heat transfer Active heat transfer Wearable materials Wearable device

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Multi-Bandgap Monolithic Metal Nanowire Percolation Network Sensor Integration by Reversible Selective Laser-Induced Redox

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Nano-Micro Letters 2022年第3期14卷 216-228页

作者： Junhyuk Bang Yeongju Jung Hyungjun Kim Dongkwan Kim Maenghyo Cho Seung Hwan ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak‑roGwanak‑guSeoul 151‑742Republic of Korea Department of Mechanical Engineering Seoul National University1 Gwanak‑roGwanak‑guSeoul 08826Republic of Korea Institute of Advanced Machines and Design Institute of Engineering ResearchSeoul National UniversitySeoul 08826Republic of Korea

Active electronics are usually composed of semiconductor and metal electrodes which are connected by multiple vacuum deposition steps and photolithography ***,the presence of interface of dissimilar material between semiconductor and metal electrode makes various problems in electrical contacts and mechanical *** ideal electronics should not have defective interfaces of dissimilar *** this study,we developed a novel method to fabricate active electronic components in a monolithic seamless fashion where both metal and semiconductor can be prepared from the same monolith material without creating a semiconductor-metal interface by reversible selective laser-induced redox(rSLIR)***,rSLIR can control the oxidation state of transition metal(Cu)to yield semiconductors with two different bandgap states(Cu_(2)O and CuO with bandgaps of 2.1 and 1.2 eV,respectively),which may allow multifunctional sensors with multiple bandgaps from the same *** novel method enables the seamless integration of single-phase Cu,Cu_(2)O,and CuO,simultaneously while allowing reversible,selec-tive conversion between oxidation states by simply shining laser ***,we fabricated a flexible monolithic metal-semiconduc-tor-metal multispectral photodetector that can detect multiple *** unique monolithic characteristics of rSLIR process can provide next-generation electronics fabrication method overcoming the limitation of conventional photolithography methods.

关键词： Monolithic integration Seamless interface Multi-bandgap nanowire Laser-induced redox Multispectral photodetector

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文心兰侧花瓣转录组分析与调控唇瓣化变异相关转录因子的挖掘

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热带作物学报 2024年第5期45卷 886-893页

作者：曾思娴余让才范燕萍华南农业大学生命科学学院广东广州510642 华南农业大学林学与风景园林学院广东广州510642 华南农业大学花卉研究中心广东广州510642

文心兰因其独特的花型和艳丽的颜色是市场上重要的鲜切花。文心兰花瓣极易产生花型多样性,为了探究调控文心兰侧花瓣唇瓣化的分子机制,对柠檬绿文心兰(Oncidium flexuosum ‘Honey Angel’)及其侧花瓣唇瓣化变异种(突变体)的侧花瓣进行... 详细信息

文心兰因其独特的花型和艳丽的颜色是市场上重要的鲜切花。文心兰花瓣极易产生花型多样性,为了探究调控文心兰侧花瓣唇瓣化的分子机制,对柠檬绿文心兰(Oncidium flexuosum ‘Honey Angel’)及其侧花瓣唇瓣化变异种(突变体)的侧花瓣进行RNA提取和转录组分析。测序结果共获得45 525 415个高质量reads,鉴定出52 253个unigenes。利用NR、Swissprot、PFAM、GO、NT、ko、koG七大数据库分别进行基因功能注释,分别注释到31 828、23 174、21 369、21 367、20 830、10 523、6465条unigenes。经表达量比较,在柠檬绿文心兰和突变体之间获得差异表达基因3120条。GO功能富集分析显示,共有1537条差异表达基因注释到生物过程、细胞组分和分子功能3个功能群组。KEGG功能富集分析显示,将690个差异表达基因富集到不同的代谢通路,其中代谢途径富集的基因最多。兰花唇瓣器官发育的研究更多地集中在MADS-box基因家族中,在该转录组数据中不仅筛选到5个显著差异表达MADS-box基因家族成员,还挖掘到其他可能与文心兰唇瓣发育相关的NAC、TCP、MYB及WRKY等转录因子。运用RT-qPCR对这些转录因子基因进行表达量验证,定量结果与RNA-seq数据一致,且这些转录因子大部分在文心兰唇瓣化侧花瓣中具有高表达,说明其可能正向调控着文心兰唇瓣器官的发育。综上所述,本研究挖掘到大量参与文心兰唇瓣化变异的关键转录因子,为兰花唇瓣发育分子机制及调控网络研究提供参考依据。

关键词：文心兰唇瓣化转录组测序差异表达基因

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Influence of Teachers’Occupational Stress on Anxiety by Using Cross-Media Teaching Method

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International Journal of Mental Health Promotion 2022年第5期24卷 649-664页

作者： Hean Liu Young Chun ko College of Science Hunan City UniversityYiyang413000China Department of Education Science Sehan UniversityChonnam58447Korea Department of Teaching Profession Sehan UniversityChonnam58447Korea

This paper is to study the conditions of teachers’occupational stress and anxiety by using cross-media teaching method,and reveals the inﬂuence relationship between *** this end,a questionnaire survey of 228 teachers using cross-media teaching method from 3 schools in Guangdong Province(China)was *** conclu-sions are as follows:Teachers who use cross-media teaching method have high levels of occupational stress and anxiety,lack of leadership and administrative support,overloaded work,state anxiety and trait anxiety are all at a high *** general characteristics differences,gender does not constitute a factor causing occupational stress and anxiety of the teachers using cross-media *** the increase in the use of cross-media teach-ing,teachers feel gradually increase of occupational stress and trait anxiety in more work tasks,and occupational stress and state anxiety shows ups and downs due to lack of school policy *** the relationship between occupational stress and anxiety,occupational stress and sub-variables without leadership and administrative sup-port,overloaded work,relationships with colleagues,and relationships with parents are all positively correlates with anxiety and have signiﬁcant positive ***,whether the inﬂuence of occupational stress sub-vari-able on anxiety,or the state anxiety and trait anxiety of the anxiety sub-variables,overloaded work and lack of leadership and administrative support have always been the key factors that cause ***,if the school or the relevant organization provides appropriate support and assistance to cross-media teaching,or appropri-ately reduce heavy tasks of teachers in cross-media teaching,so as to relieve occupational press and anxiety of the teachers,create good teaching quality,and promote the development of teaching technology.

关键词： Cross-media teaching teacher occupational stress anxiety

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Lunate dislocation with avulsed triquetral fracture: A case report

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World Journal of Clinical Cases 2022年第1期10卷 331-337页

作者： Ling-Yi Li Cheng-Jyh Lin Chih-yuan ko Department of Orthopedic Surgery China Medical University HospitalTaichung City 40402Taiwan

BACKGROUND Lunate dislocation is an uncommon traumatic wrist injury that require prompt surgical *** or delayed treatment often leads to a poor *** reduction and surgical repair of disrupted ligaments are done in most cases to prevent long-term joint ***,this method has certain limitations that include partial functional improvement,which poses a high risk for degenerative arthritis and wrist *** SUMMARY A 37-year-old man presented to the Emergency Department of our hospital following a motorcycle *** examination revealed swelling and tenderness of the right hand and *** patient was initially misdiagnosed with a wrist contusion by an emergency physician,but was eventually diagnosed with lunate dislocation associated with a triquetral avulsed fracture,indicated for open reduction and ligament *** performed closed reduction and two Kirschner wire fixations following Tavernier’s *** injured hand was protected with a standard short-arm orthosis for one *** patient returned to normal daily work without discomfort at five months ***,there was no lunate necrosis or arthritis in the latest radiologic *** This case provides evidence that the closed reduction technique for addressing such cases can reduce soft tissue destruction.

关键词： Hand trauma Carpal injury Lunate dislocation Triquetral fracture Closed reduction Case report

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Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2023年第4期79卷 562-568页

作者： Gwonsik Nam Jaeseong Hwang Donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong ko Division of Convergence Materials Engineering Pukyong National UniversityBusan 48547Republic of Korea Namyang R&D Center Hyundai Motor CompanyHwaseong 18280Republic of Korea Division of Industrial Chemistry and Polymer Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance ***,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated ***-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline ***,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary *** a result,single-crystalline Ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage *** work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

关键词： Lithium-ion batteries Ni-rich cathode materials Mechanical densification Solid-state synthesis

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Small-scale analysis of brittle-to-ductile transition behavior in pure tungsten

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Journal of Materials Science & Technology 2022年第10期105卷 242-258页

作者： Yeonju Oh Won-Seok ko Nojun Kwak Jae-il Jang Takahito Ohmura Heung Nam Han Department of Materials Science and Engineering&Research Institute of Advanced Materials Seoul National UniversitySeoul 08826South Korea School of Materials Science and Engineering University of UlsanUlsan 44610South Korea Division of Materials Science and Engineering Hanyang UniversitySeoul04763South Korea National Institute for Materials Science 1-2-1 SengenTsukubaIbaraki 305-0047Japan

Tungsten as a material exhibits broad and increasingly important applications;however,the characterization of its ductile-to-brittle transition(BDT)is currently limited to large-scale scenarios and destructive *** this study,we overcome this challenge by implementing small-scale techniques to provide a comprehensive understanding of the BDT behavior of pure *** order to predict the failure mode at various temperature ranges,the practical fracture analysis diagram has been proposed to describe the resistance to shear flow and cracking behavior with *** temperature nano-indentation tests have provided the inherent mechanical responses corresponding to the maximum shear stress at various temperatures,which is required for dislocation activities in an atomic scaled activation *** one hand,atomistic simulations have provided the temperature dependence of brittle fracture stress,where the atomic bonds break due to intergranular or intragranular *** considered four tungsten specimens having various microstructures prepared using different processing conditions of cold-rolling and post-annealing,and their BDT ranges were inferred using the obtained fracture analysis diagram with the statistical data *** fracture analysis diagram of each specimen obtained were compared with the direct observation of fracture responses in macroscopic mechanical tests,which conclusively indicated that the small-scale inherent mechanical properties are greatly relevant to the macroscopic BDT behavior in pure *** on the BDT estimations by small-scale characterization,we provided further insights into the factors affecting the BDT behavior of tungsten,focusing on the contributions of different types of dislocations.

关键词： Brittle-to-ductile transition Nano-indentation Molecular dynamics Dislocation Tungsten

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Micro/nano-wrinkled elastomeric electrodes enabling high energy storage performance and various form factors

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Carbon Energy 2023年第12期5卷 137-152页

作者： Changeun Yoo Seokmin Lee Yongkwon Song Woojae Chang Moon Kyu Park Younji ko Jinhan Cho Department of Chemical and Biological Engineering Korea UniversitySeoulSeongbuk-guRepublic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSeongbuk-guRepublic of Korea Soft Hybrid Materials Research Center Advanced Materials Research DivisionKorea Institute of Science and Technology(KIST)Seongbuk-guSeoulRepublic of Korea

Stretchable elastomer-based electrodes are considered promising energy storage electrodes for next-generation wearable/flexible electronics requiring various shape ***,these elastomeric electrodes suffer from the limited electrical conductivity of current collectors,low charge storage capacities,poor interfacial interactions between elastomers and conductive/active materials,and lack of shape *** this study,we report hierarchically micro/nano-wrinkle-structured elastomeric electrodes with notably high energy storage performance and good mechanical/electrochemical stabilities,simultaneously allowing various form *** this study,a swelling/deswelling-involved metal nanoparticle(NP)assembly is first performed on thiol-functionalized polydimethylsiloxane(PDMS)elastomers,generating a micro-wrinkled structure and a conductive seed layer for subsequent *** the assembly of metal NPs,the conformal electrodeposition of Ni and NiCo layered double hydroxides layers with a homogeneous nanostructure on the micro-wrinkled PDMS induces the formation of a micro/nano-wrinkled surface morphology with a large active surface area and high electrical *** on this unique approach,the formed elastomeric electrodes show higher areal capacity and superior rate capability than conventional elastomeric electrodes while maintaining their electrical/electrochemical properties under external mechanical *** notable mechanical/electrochemical performance can be further enhanced by using spiral-structured PDMS(stretchability of~500%)and porous-structured PDMS(areal capacity of~280μAh cm^(-2)).

关键词： elastomeric electrodes electrodeposition micro/nano-wrinkled structures

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Improving the electrochemical stability of AZ31 Mg alloy in a 3.5wt.%NaCl solution via the surface functionalization of plasma electrolytic oxidation coating

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Journal of Magnesium and Alloys 2022年第5期10卷 1311-1325页

作者： Mosab Kaseem Tehseen Zehra Burak Dikici Ali Dafali Hae Woong Yang Young Gun ko Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Metallurgical and Materials Engineering Ataturk UniversityErzurum 25240Turkey Faculty of Sciences Oujda Department of ChemistryMohamed the First UniversityOujdaMorocco Pohang Institute of Metal Industry Advancement Pohang 37666Republic of Korea Materials Electrochemistry Group School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea

The unique interactions between hexadecanoic acid(HA)and albumin(ALB)molecules on the surface of the porous layer of AZ31 Mg alloy were exploited to fabricate a novel hybrid composite film with excellent electrochemical stability in a 3.5 wt.%Na Cl ***,the inorganic layer(IL)obtained by plasma electrolytic oxidation of AZ31 Mg alloy in an alkaline-phosphate-WO_(3)electrolyte was soaked in an organic solution composed of ALB and HA for 10 and 24 h at 60℃.Although albumin and HA may coexist on the same surface of IL,the higher reactivity of ALB molecules would prevent the formation of a thick layer of *** donor-acceptor complexes formed due to the unique interactions between ALB and/or HA and IL surface would reduce the area exposed to the corrosive species which in turn would efficiently protect the substrate from *** porous structure of the IL would provide preferable sites for the physical and chemical locking triggered by charge-transfer phenomena,leading to the inhomogeneous nucleation and crystal growth of a flowery flakes-like organic *** calculations were performed to reveal the primary bonding modes between the ALB,HA,and IL and to assess the mechanistic insights into the formation of such novel hybrid composites.

关键词： Hybrid composite Coordination bond Albumin Fatty acid Porous layer Corrosion Theoretical approach

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