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Large-signal SPICE model for depletion-type silicon ring modulators

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Photonics Research 2019年第9期7卷 948-954页

作者： MINKYU kim MYUNGJIN SHIN MIN-HYEONG kim BYUNG-MIN YU younghyun kim YOOJIN BAN STEFAN LISCHKE CHRISTIAN MAI LARS ZIMMERMANN WOO-YOUNG CHOI Department of Electrical and Electronic Engineering Yonsei University03722SeoulSouth Korea Now at University of Michigan Ann Arbor48109MichiganUSA Now at Samsung Electronics Hwasung18448Gyeonggi-doSouth Korea Now at IMEC Kapeldreef753001LeuvenBelgium IHP Im Technologiepark2515236Frankfurt(Oder)Germany

We present an accurate, easy-to-use large-signal SPICE circuit model for depletion-type silicon ring modulators(Si RMs). Our model includes both the electrical and optical characteristics of the Si RM and consists of circuit elements whose values change depending on modulation voltages. The accuracy of our model is confirmed by comparing the SPICE simulation results of 25 Gb/s non-return-to-zero(NRZ) modulation with the measurement. The model is used for performance optimization of monolithically integrated Si photonic NRZ and pulse-amplitudemodulation 4 transmitters in the standard SPICE circuit design environment.

关键词： RM Block Large-signal SPICE model for depletion-type silicon ring modulators

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

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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

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

Identification of Aristolactam Derivatives That Act as Inhibitors of Human Immunodeficiency Virus Type 1 Infection and Replication by Targeting Tat-Mediated Viral Transcription

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Virologica Sinica 2021年第2期36卷 254-263页

作者： Young Hyun Shin Chul Min Park Hong Gi kim Dong-Eun kim Min Suk Choi Jeong-ah kim Byeong-Sun Choi Cheol-Hee Yoon Division of Viral Disease Research Center for Infectious Disease ResearchKorea National Institute of HealthHeungdeok-guCheongju-siShungbuk 28159Republic of Korea Center for Convergent Research of Emerging Virus Infection Korea Research Institute of Chemical TechnologyYuseong-guDaejeon 34114Republic of Korea

Despite the success of antiretroviral therapy(ART),efforts to develop new classes of antiviral agents have been hampered by the emergence of drug ***-indole-bearing aristolactams are compounds that have been isolated from various plants species and which show several clinically relevant effects,including anti-inflammatory,antiplatelet,and antimycobacterial ***,the effect of these compounds on human immunodeficiency virus type 1(HIV-1)infection has not yet been *** this study,we discovered an aristolactam derivative bearing dibenzo[cd,f]indol-4(5 H)-one that had a potent anti-HIV-1 effect.A structure-activity relationship(SAR)study using nine synthetic derivatives of aristolactam identified the differing effects of residue substitutions on the inhibition of HIV-1 infection and cell *** the compounds tested,1,2,8,9-tetramethoxy-5-(2-(piperidin-1-yl)ethyl)-dibenzo[cd,f]indol-4(5 H)-one(Compound 2)exhibited the most potent activity by inhibiting HIV-1 infection with a half-maximal inhibitory concentration(IC50)of 1.03 lmol/L and a half-maximal cytotoxic concentration(CC50)of 16.91 lmol/L(selectivity index,16.45).The inhibitory effect of the compounds on HIV-1 infection was linked to inhibition of the viral replication ***-of-action studies showed that the aristolactam derivatives did not affect reverse transcription or integration;instead,they specifically inhibited Tat-mediated viral *** together,these findings show that several aristolactam derivatives impaired HIV-1 infection by inhibiting the activity of Tat-mediated viral transcription,and suggest that these derivatives could be antiviral drug candidates.

关键词： Human immunodeficiency virus type 1(HIV-1) Aristolactam Antiviral activity HIV-1 transcription