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Charge-carrier photogeneration and extraction dynamics of polymer solar cells probed by a transient photocurrent nearby the regime of the space charge-limited current

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 164-179页

作者： Boa Jin Hyunmin Park Yang Liu Leijing Liu Jongdeok An Wenjing Tian chan im Department of Chemistry Konkuk UniversitySeoul 05029Republic of Korea State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

To understand the complex behaviors of photogenerated charge carriers within polymer-based bulk-heterojunction-type solar cells,the charge-carrier photogeneration and extraction dynamics are simultaneously estimated using a transient photocurrent technique under various external-bias voltages,and a wide range of excitation intensities are *** this purpose,conventional devices with 80 nm thick active layers consisting of a blend of representative P3HT and PTB7 electron-donating polymers and proper electron-accepting fullerene derivatives were *** the correction for the saturation behavior at a high excitation-intensity range nearby the regime of the space charge-limited current,the incident-photon-density-dependent maximum photocurrent densities at the initial peaks are discussed as the proportional measures of the charge-carrier-photogeneration *** comparing the total number of the extracted charge carriers to the total number of the incident photons and the number of the initially photogenerated charge carriers,the external quantum efficiencies as well as the extraction quantum efficiencies of the charge-carrier collection during a laser-pulse-induced transient photocurrent process were ***,the charge-carrier concentration-dependent mobility values were obtained,and they are discussed in consideration of the additional influences of the charge-carrier losses from the device during the charge-carrier extraction that also affects the photocurrent-trace shape.

关键词： charge-carrier photogeneration transient photocurrent polymer solar cells charge-carrier extraction space charge-limited current

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Long-lasting photoluminescence quantum yield of cesium lead halide perovskite-type quantum dots

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 187-197页

作者： Yonghyun Kim Huiwen Liu Yi Liu Boa Jin Hao Zhang Wenjing Tian chan im Department of Chemistry Konkuk UniversitySeoul 05029Korea State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Cesium lead halide perovskite(CsPbX_(3),X=Cl,Br,I)quantum dots(QDs)and their partly Mn^(2+)-substituted QDs(CsPb1–xMnxX3)attract considerable attention owing to their unique photoluminescence(PL)*** two types of QDs,having different PL decay dynamics,needed to be further investigated in a form of aggregates to understand their solid-state-induced exciton dynamics in conjunction with their behaviors upon degradation to achieve practical applications of those promising ***,thus far,these QDs have not been sufficiently investigated to obtain deep insights related to the long-term stability of their PL properties as aggregated ***,in this study,we comparatively examined CsPbX_(3)-and CsPb1–xMnxX_(3)-type QDs stocked for>50 d under dark ambient conditions by using excitation wavelength-dependent PL quantum yield and time-resolved PL *** investigations were performed with powder samples in addition to solutions to determine the influence of the inter-QD interaction of the aged QD aggregates on their radiative *** turns out that the Mn^(2+)-substituted QDs exhibited long-lasting PL quantum efficiencies,while the unsubstituted CsPbX_(3)-type QDs exhibited a drastic reduction of their PL *** the obtained PL traces were clearly sensitive to the sample *** is discussed with the possible interaction depending on the size and distance of the QD aggregates.

关键词： quantum dots cesium lead halide perovskite time-resolved photoluminescence PL quantum yield QD aggregates

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White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends

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Chinese Physics B 2010年第3期19卷 546-550页

作者：陈飞鹏徐斌赵祖金田文晶吕萍 im chan State Key Laboratory of Supramolecular Structure and Materials Jilin University Department of Chemistry Zhejiang University Department of Chemistry Konkuk UniversityKorea

White organic light-emitting diodes with a blue emitting material fluorene-centred ethylene-liked carbazole oligomer （Cz6F） doped into polyvinyl carbazole （PVK） as the single light-emitting layer are reported. The optical properties of Cz6F, PVK, and PVK：Cz6F blends are studied. Single and double layer devices are fabri- cated by using PVK： Cz6F blends, and the device with the configuration of indium tin oxide （ITO）/PVK：Cz6F/ tris（8-hydroxyquinolinate）aluminium （Alq3）/LiF/A1 exhibits white light emission with Commission Internationale de l＇Eclairage chromaticity coordinates of （0.30, 0.33） and a brightness of 402 cd/m^2. The investigation reveals that the white light is composed of a blue-green emission originating from the excimer of Cz6F molecules and a red emission from an electroplex from the PVK：Cz6F blend films.

关键词： white organic light-emitting diodes electroluminescence electroplex

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Effects of BTA2 as the third component on the charge carrier generation and recombination behavior of PTB7:PC71BM photovoltaic system

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 127-137页

作者： Leijing Liu Hao Zhang Bo Xiao Yang Liu Bin Xu Chen Wang Shanpeng Wen Erjun Zhou Gang Chen chan im Wenjing Tian State Key Laboratory of Supramolecular Structures and Materials Jilin UniversityChangchun 130012China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Laboratory on Integrated Optoelectronics and College of Electronic Science&Engineering Jilin UniversityChangchun 130012China Key Laboratory of Physics and Technology for Advanced Batteries Ministry of EducationJilin UniversityChangchun 130012China Department of Chemistry Konkuk UniversitySeoul 05029Republic of Korea

Effects of a benzotriazole(BTA)-based small molecule,BTA2,as the third component on the charge carrier generation and recombination behavior of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]](PTB7):[6,6]-phenyl-C71-butyric acid methyl ester(PC71BM)organic solar cells(OSCs)were investigated by optical simulation of a transfer matrix model(TMM),photo-induced charge extraction by linearly increasing voltage(photo-CELIV)technique,atomic force microscope(AFM),and the Onsager–Braun model ***2 is an A_(2)-A_(1)-D-A_(1)-A_(2)-type non-fullerene small molecule with thiazolidine-2,4-dione,BTA,and indacenodithiophene as the terminal acceptor(A_(2)),bridge acceptor(A_(1)),and central donor(D),*** short-circuit current density of the OSCs with BTA2 can be enhanced significantly owing to a complementary absorption *** optical simulation of TMM shows that the ternary OSCs exhibit higher internal absorption than the traditional binary OSCs without BTA2,resulting in more photogenerated excitons in the ternary *** photo-CELIV investigation indicates that the ternary OSCs suffer higher charge trap-limited bimolecular recombination than the binary *** images show that BTA2 aggravates the phase separation between the donor and the acceptor,which is disadvantageous to charge carrier *** Onsager-Braun model analysis confirms that despite the charge collection efficiency of the ternary OSCs being lower than that of the binary OSCs,the optimized photon absorption and exciton generation processes of the ternary OSCs achieve an increase in photogenerated current and thus improve power conversion efficiency.

关键词： third component organic solar cells charge carrier generation charge carrier recombination bimolecular recombination

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Transmural penetration of sigmoid colon and rectum by retained surgical sponge after hysterectomy

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World Journal of Gastroenterology 2016年第10期22卷 3052-3055页

作者： Woo Young Shin chan Hyuk im Sun Keun Choi Yun-Mee Choe Kyung Rae Kim Department of Surgery Inha University HospitalInha University College of Medicine

Gossypiboma is a surgical sponge that is retained in the body after the operation. A 39-year-old female presented with vague lower abdominal pain, fever, and rectal discharge 15 mo after hysterectomy. The sponge remaining in the abdomen had no radiopaque marker. Therefore a series of radiographic evaluations was fruitless. The surgical sponge was found in the rectosigmoid colon on colonoscopy. The sponge penetrated the sigmoid colon and rectum transmurally, forming an opening on both sides. The patient underwent low anterior resection and was discharged without postoperative complications.

关键词： Gossypiboma Textiloma Retained foreign object Surgical sponge Radiopaque marker

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添加剂对PTB7:PC71BM体系载流子行为的影响

添加剂对PTB7:PC71BM体系载流子行为的影响

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中国化学会2017全国高分子学术论文报告会

作者：田文晶刘洋徐斌 chan im 吉林大学超分子结构与材料国家重点实验室韩国建国大学化学系

有机聚合物光伏材料的载流子特性研究对于理解和认识有机光伏材料的基本物理过程及其内在机制,特别是光生载流子产生、输运以及复合等载流子动力学过程具有非常重要的意义。我们利用瞬态光电流TPC技术和线研究了添加剂二碘辛烷（DIO）... 详细信息

有机聚合物光伏材料的载流子特性研究对于理解和认识有机光伏材料的基本物理过程及其内在机制,特别是光生载流子产生、输运以及复合等载流子动力学过程具有非常重要的意义。我们利用瞬态光电流TPC技术和线研究了添加剂二碘辛烷（DIO）对基于PTB7:PC71BM混合体系的太阳能电池载流子行为的影响。首先,我们研究了不同激发光强度下添加剂DIO对混合体系瞬态光电流行为的影响。结果表明,在活性层添加DIO后,混合体系瞬态光电流的初始峰值有了显著的提高,说明DIO可以有效地降低混合体系中的载流子复合。进一步,我们利用CELIV技术研究了添加剂DIO对混合体系载流子复合的影响。研究表明,在PTB7:PC71BM体系中的非孪生复合是束缚态限制的载流子双分子复合。添加剂DIO能优化改善活性层的形貌,减小PC71BM聚集体的尺寸,在体异质结中形成更好的网络互穿结构,从而提升载流子的传输,降低载流子的双分子复合。

关键词： PTB7 体异质结太阳能电池 TPC CELIV 载流子复合

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Scalable Ir‑Doped NiFe_(2)O_(4)/TiO_(2)Heterojunction Anode for Decentralized Saline Wastewater Treatment and H_(2)Production

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Nano-Micro Letters 2025年第3期17卷 1-18页

作者： Sukhwa Hong Jiseon Kim Jaebeom Park Sunmi im Michael R.Hoffmann Kangwoo Cho Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 790−784Korea Linde Laboratory California Institute of TechnologyPasadenaCA 91125USA Institute for Convergence Research and Education in Advanced Technology(I‑CREATE) Yonsei University International CampusIncheon 21983Republic of Korea

Wastewater electrolysis cells(WECs)for decentralized wastewater treatment/reuse coupled with H_(2)production can reduce the carbon footprint associated with transportation of water,waste,and energy *** study reports Ir-doped NiFe_(2)O_(4)(NFI,~5 at%Ir)spinel layer with TiO_(2)overlayer(NFI/TiO_(2)),as a scalable heterojunction anode for direct electrolysis of wastewater with circumneutral pH in a single-compartment *** dilute(0.1 M)NaCl solutions,the NFI/TiO_(2)marks superior activity and selectivity for chlorine evolution reaction,outperforming the benchmark IrO_(2).Robust operation in near-neutral pH was *** including operando X-ray absorption spectroscopy unveiled crucial roles of TiO_(2) which serves both as the primary site for Cl−chemisorption and a protective layer for NFI as an ohmic *** electrolysis of NH4+-laden synthetic wastewater demonstrated that NFI/TiO_(2)not only achieves quasi-stoichiometric NH_(4)^(+)-to-N_(2)conversion,but also enhances H_(2)generation efficiency with minimal competing reactions such as reduction of dissolved oxygen and reactive *** scaled-up WEC with NFI/TiO_(2)was demonstrated for electrolysis of toilet wastewater.

关键词： Wastewater electrolysis cell Ir-doped NiFe_(2)O_(4) Reactive chlorine species Decentralized H_(2)production On-site wastewater treatment

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In vivo analysis of post-joint-preserving surgery fracture of 3D-printed Ti-6Al-4V implant to treat bone cancer

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Bio-Design and Manufacturing 2021年第4期4卷 879-888页

作者： Jong Woong Park Ye chan Shin Hyun Guy Kang Sangeun Park Eunhyeok Seo Hyokyung Sung im Doo Jung Division of Convergence Technology National Cancer CenterGoyang 10408Republic of Korea Orthopaedic Oncology Clinic National Cancer CenterGoyang 10408Republic of Korea Department of Materials Engineering and Convergence Technology Gyeongsang National UniversityJin-Ju 52828Republic of Korea Department of Mechanical Engineering Ulsan National Institute of Science and TechnologyUNIST-Gil 50Ulsan 44919Republic of Korea

Cancer growth in the bone due to its random shape disables bone strength and thus changes its capacity to support body weight or muscles,which can crucially affect the quality of human life in terms of normal walking or daily *** successful patient recovery,it is necessary to remove the cancer-affected minimal bone area and quickly replace it with a biocompatible metal implant within less than 2 *** electron beam-melted Ti-6Al-4V implant was designed and applied in a patient to preserve the natural knee joint close to the bone *** developed implant fits the bone defect well,and the independent ambulatory function of the natural knee joint was restored in the patient within six weeks after surgery.A delayed fracture occurred six months after the successful replacement of cancer-affected bone with Ti-6Al-4V implant at the proximal meshed junction of the implant because of a minor downward ***,mechanical,and computational analyses were conducted for the fractured area to find the main reason for the delayed *** findings pertaining to the mechanical and material investigation can help realize the safe implantation of the three-dimensionally printed titanium implant to preserve the natural joints of patients with massive bone defects of the extremities.

关键词： 3D printing Bone cancer Titanium alloy implant Electron beam melting Fracture analysis

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Spatial analysis of vegetation cover response to climate trends in Khakassia(South Siberia)

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Journal of Mountain Science 2023年第10期20卷 2869-2884页

作者： im Sergei Institute of Natural Sciences and Mathematics Khakassian State University named after N.F.KatanovAbakan 655000Russia V.N.Sukachev Institute of Forest Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of ScienceKrasnoyarsk 660036Russia Institute of Ecology and Geography Siberian Federal UniversityKrasnoyarsk 660041Russia Institute of Space Research and High Technologies Reshetnev Siberian State University of Science and TechnologyKrasnoyarsk660014Russia

An analysis of the changes in vegetation cover on the territory of the Republic of Khakassia in 2000–2021 due to climatic trends was carried out based on the MODIS *** changes in vegetation cover were estimated based on trends in Normalized Difference Vegetation Index(NDVI)and Enhanced Vegetation Index(EVI).In general,in the 21st century,an increase in the biomass of vegetation cover is *** trends were observed in 16%–22%of the territory,and negative only in 1%–3%.For about 20%of the analyzed territory,a significant influence of climate on the changes in vegetation cover was *** most pronounced negative impact on vegetation cover was caused by summer air and soil temperatures,spring temperature,and summer winds,and the positive impact was caused by summer precipitation and soil *** response of the vegetation cover to climate was non-uniform concerning the ***,a significant correlation with the amount of precipitation was observed for~20%–35%of vegetation growing below 600 m above sea level and for less than 5%above this *** negative effect of summer temperatures on plants prevailed mainly at an elevation below~1400 m above sea *** climate change is likely to lead to significant degradation of vegetation in the steppe and foreststeppe in Khakassia in the coming decades.

关键词： Khakassia South Siberia Vegetation cover Climate trends Remote sensing MODIS NDVI EVI Relief

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Stochastic structural optimization using particle swarm optimization, surrogate models and Bayesian statistics

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Chinese Journal of Aeronautics 2013年第1期26卷 112-121页

作者： Jongbin im Jungsun Park Korea Aerospace Research Institute Department of Aerospace and Mechanical Engineering Korea Aerospace University

This paper focuses on a method to solve structural optimization problems using particle swarm optimization （PSO）, surrogate models and Bayesian statistics. PSO is a random/stochastic search algorithm designed to find the global optimum. However, PSO needs many evaluations compared to gradient-based optimization. This means PSO increases the analysis costs of structural optimization. One of the methods to reduce computing costs in stochastic optimization is to use approximation techniques. In this work, surrogate models are used, including the response surface method （RSM） and Kriging. When surrogate models are used, there are some errors between exact values and approximated values. These errors decrease the reliability of the optimum values and discard the realistic approximation of using surrogate models. In this paper, Bayesian statistics is used to obtain more reliable results. To verify and confirm the efficiency of the proposed method using surrogate models and Bayesian statistics for stochastic structural optimization, two numerical examples are optimized, and the optimization of a hub sleeve is demonstrated as a practical problem.

关键词： Bayesian statistics Kriging Particle swarm optimization (PSO) Response surface method (RSM)

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