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Synthesis of stable iodoplumbate and perovskite for efficient annealing-free device and long-term storage

SusMat 2023年第6期3卷 821-833页

作者： Jihyun Kim Sang-Won Park younghyun lee Hideo Hosono Byungwoo Park Jinhyun Kim Department of Chemical and Materials Engineering University of SuwonHwaseongSouth Korea MDX Research Center for Element Strategy International Research Frontiers InitiativeTokyo Institute of TechnologyYokohamaJapan Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeonSouth Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulSouth Korea

As a next-generation photovoltaic device,perovskite solar cells are rapidly ***,both solution and device stability pose challenges for commercialization due to chemical degradation caused by internal and external ***,the decomposition of iodoplumbate in a perovskite solution hinders the long-term use of perovskite ***,the synthesis of stable perovskites at low temperature is important for stable devices and wide applications(flexible devices and high reproducibility).Herein,the critical composition of perovskite is found to obtain high stabilities of both iodoplumbate and perovskite crystals by utilizing CsPbBr_(3) and FAPbI_(3),exhibiting high device performance and long-term solution *** novel composition of CsPbBr_(3)-alloyed FAPbI_(3) not only crystallizes under annealing-free conditions but also demonstrates excellent iodoplumbate stability for 100 days(∼3000 h)without any ***,high device stabilities are achieved over 2000 and 3000 h under extreme conditions of A.M.1.5 and 85℃/85%relative humidity,***,the device exhibited a high power conversion efficiency of 23.4%,and furthermore,CsPbBr_(3)-alloyed FAPbI_(3) was devoted to widen the applications in both flexible and carbon-electrode devices,thereby addressing both scientific depths and potential commercial materials.

关键词： annealing free DFT calculation iodoplumbate long-term stability perovskite solar cells

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Utilizing hybrid faradaic mechanism via catalytic and surface interactions for high-performance flexible energy storage system

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能源化学:英文版 2023年第8期83卷 541-548,I0013页

作者： Dong-Gyu lee Hyeonggeun Choi Yeonsu Park Min-Cheol Kim Jong Bae Park Suok lee younghyun Cho Wook Ahn A-Rang Jang Jung Inn Sohn John Hong Young-Woo lee Department of Energy Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Division of Physics and Semiconductor Science Dongguk University-SeoulSeoul 04620Republic of Korea Jeonju Centre Korea Basic Science InstituteJeonju 54907Republic of Korea Division of Electrical Electronic and Control EngineeringKongju National UniversityCheonan 31080Republic of Korea School of Materials Science and Engineering Kookmin UniversitySeoul 02707Republic of Korea

Improving the capacitance and energy density is a significant challenge while developing practical and flexible energy storage system(ESS).Redox mediators(RMs),as redox-active electrolyte additives,can provide additional energy storing capability via electrochemical faradaic contribution on electrodes for high-performance flexible ***,determining effective material combinations between electrodes and RMs is essential for maximizing surface faradaic redox reactions for energy-storage *** this study,an electrode-RM system comprising heterostructured hybrid(carbon fiber(CF)/MnO_(2)) faradaic electrodes and iodine RMs(I-RMs) in a redox-active electrolyte is *** CF/MnO_(2)with the 1-RMs(CF/MnO_(2)-I) induces dominant catalytic faradaic interaction with the I-RMs,significantly enhancing the surface faradaic kinetics and increasing the overall energy-storage *** CF/MnO_(2)-I ESSs show a 12.6-fold(or higher) increased volumetric energy density of 793.81 mWh L^(-1)at a current of 10 μA relative to ESSs using CF/MnO_(2)without I-RMs(CF/MnO_(2)).Moreover,the CF/MnO_(2)-I retains 93.1% of its initial capacitance after 10,000 cycles,validating the excellent ***,the flexibility of the ESSs is tested at different bending angles(180° to 0°),demonstrating its feasibility for flexible and high-wear ***,CF/MnO_(2)electrodes present a practical material combination for high-performance flexible energy-storage devices owing to the catalytic faradaic interaction with I-RMs.

关键词： Energy storage system Redox mediators Faradaic electrodes Catalytic interactions Mechanical stability

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Measurement of the birefringence distribution in high resolution laser scanning lenses

Measurement of the birefringence distribution in high resolu...

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20th Congress of the International Commission for Optics

作者： Hee sung Cho Yun Woo lee Jae Hyeob lee Chang Kwon Hwangbo Jong Ung lee Optical nano Metrology KRISS Yuseong Daejon Korea Dept.of Physics Inha University 253 Younghyun-dong Incheon Korea Dept.of Laser & Optical Information Engineering Chongju University36 Naedok-dong Chongju Korea

We present a polarization analysis system to measure UIF birefringence of scanning lens. This technique is based onrotating-analyzer ellipsometer. The liquid immersion method is applied to

关键词： birefringence Polarization f-theta lens

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A Framework of Location Awareness for Ubiquitous Learning

A Framework of Location Awareness for Ubiquitous Learning

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The Sixth International Conference on Information and Management Sciences

作者： Dong-Wook lee Hae-Young Bae Dept.of Computer Science ＆ Engineering Inha University younghyun-dong Nam-KuIncheon402-751Korea Dept.of Computer Science ＆ Engineering Inha University younghyun-dong Nam-KuIncheon402-751Korea

＜正＞In this paper,we describe a location-based awareness learning method for ubiquitous *** utilizes learning logs to record the location data,learning contents and interactive learner’s information;therefore it can solve the study permanent problem caused by location variation in the old learning *** this system,the learner can start the new study,and also can continue the former learning by his ***,this paper discusses the material storage and log management and the experiment method of this system.

关键词： Ubiquitous Learning Location awareness learning log

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