Article
Engineering, Electrical & Electronic
Rui Su, Chuanhui Cheng
Summary: This article proposes a method using a barrier layer to realize electrode unipolar charge carrier injection, and investigates the injection characteristics of positive and negative charge carriers by different electrode materials. The accuracy of the relationship between the accumulation rate of injected charge carriers and electrode field strength in characterizing charge injection behavior was verified through space charge measurement and theoretical model analysis. This study provides techniques and theoretical guidance for the testing and development of semiconductive materials in XLPE direct-current cables.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Materials Science, Characterization & Testing
Chengcheng Zhang, Xiangqing Kong, Wenxin Liu, Jiaming Yang, Hong Zhao
Summary: Adding PANI nanofibers into LDPE can improve space charge distribution, with doped PANI nanofibers having higher conductivity and more effectively suppressing space charge accumulation, but also reducing the DC breakdown strength of the nanocomposites. Overall, dedoped PANI nanofibers are superior for the DC dielectric properties of LDPE.
Article
Engineering, Electrical & Electronic
Wei Deng, Yuanyuan Ren, Kexin Qu, Hong Zhao
Summary: In this study, a novel graftable voltage stabilizer MDVS was successfully developed to improve the insulation properties of polyethylene. MDVS effectively suppressed space charge accumulation and decreased electrical conductivity in the materials. The MDVS-grafted materials exhibited higher breakdown strength than pristine polyethylene, and the stabilizing effect of MDVS was more efficient than conventional stabilizer DHBP even after high-temperature degassing. Thermally stimulated current tests and quantum chemical calculations supported the improvement of insulation properties by capture and trap mechanisms.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Chemistry, Physical
Peng Li, Xuan Wang, Jin Jin, Hui Zhang, Wei Han
Summary: Grafting bismaleimide ethane (BMIE) onto the polyethylene molecular chain can enhance the direct current (DC) dielectric properties of cross-linked polyethylene (XLPE) by creating deep traps and improving insulation performance.
Article
Physics, Applied
Zepeng Lv, Jinyang Peng, Yuntong Ma, Bingjie Wang, Chen Zhang, Jie Yao, Kai Wu, Yonghong Cheng
Summary: This paper proposes a quantitative estimation method of charge injection at the metal/polymer interface by simultaneously measuring space charge and current. The relationship between electrode electric field and pure injection current is analyzed.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Yan Zhu, Thorsten Trupke, Ziv Hameiri
Summary: This study introduces a dynamic calibration method for injection-dependent carrier lifetime measurements, which compares lifetime measurements under quasi-steady-state and non-quasi-steady-state conditions to achieve precise calibration of experimental data and provide the net bulk doping concentration.
Article
Materials Science, Multidisciplinary
Jose P. Jurado, Bernhard Dorling, Osnat Zapata-Arteaga, Alejandro R. Goni, Mariano Campoy-Quiles
Summary: Coupling thermoelectrics with photovoltaics is an efficient method for solid-state solar harvesting, especially using organic semiconductors with low thermal conductivities. By comparing different geometries of PV-TE hybrid devices, it was found that the transmission contact mode is the most effective configuration. The combination of thermoelectrics with OPV modules not only enhances performance under illumination but also reduces losses from convection, leading to increased efficiency and thermoelectric generation.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Applied
Jiu-Xun Sun, Hong-Chun Yang, Yang Li, Hai-Juan Cui
Summary: Although the accurate solution of the drift-diffusion model has been a challenge in semiconductor physics, this study presents a new approach based on Fermi-Dirac statistics and a general mobility model. The results demonstrate noticeable differences between the accurate solution and other existing solutions, such as the Scharfetter-Gummel scheme and the Mott-Gurney equation.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Egbert Zojer, Christian Winkler
Summary: MOFs offer the potential to create materials with high charge carrier mobilities by controlling the arrangement of Jr-conjugated entities, but current results are still unsatisfactory. Research shows that targeted network design and structural modifications have the potential to significantly enhance charge transport properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Azadeh Soroudi, Yingwei Ouyang, Fritjof Nilsson, Ida Ostergren, Xiangdong Xu, Zerui Li, Amir Masoud Pourrahimi, Mikael Hedenqvist, Thomas Gkourmpis, Per-Ola Hagstrand, Christian Muller
Summary: Octyl-silane-coated Al2O3 nanoparticles are a promising conductivity-reducing additive for thermoplastic ternary blends. The ternary blend nanocomposites, prepared using LDPE-based masterbatch containing the nanoparticles, exhibited superior stiffness and reduced electrical conductivity. This material has potential for use in designing resistive thermoplastic insulation materials for high-voltage direct current (HVDC) power cables.
Article
Materials Science, Multidisciplinary
Salvatore Gambino
Summary: The study found that a prototypical conjugated polymer does not show any preference for the transport of electrons or holes, exhibiting ambipolar charge transport. The presence of traps and unintentional p-doping makes it difficult to address the intrinsic nature of the charge transport mechanism. Analysis of experimental data revealed that the charge transport of holes is mainly governed by energetic disorder, while the electrons' conduction is controlled by both energetic and positional disorder.
Article
Energy & Fuels
Chaudhry Usman, Abdelnasser Mabrouk, Ahmed Abdala
Summary: In this study, enhanced thermal conductivity of low-density polyethylene (LDPE) with granulated graphene was achieved. The dispersal of granulated graphene in LDPE and its broad size distribution contributed to significant increase in thermal conductivity. Additionally, the theoretical model provided accurate prediction of thermal conductivity versus filler loading.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Cheng Chang, Maria Ibanez
Summary: By employing an aqueous method to synthesize SnTe nanocomposites and unique surface treatment with soluble PbS molecular complex, the carrier mobility of the nanocomposite is significantly improved with reduced lattice thermal conductivity, reaching an enhanced ZT of about 0.8 at 873K.
Article
Chemistry, Multidisciplinary
Marta Martinez-Abadia, Rajeev K. Dubey, Mercedes Fernandez, Miguel Martin-Arroyo, Robert Aguirresarobe, Akinori Saeki, Aurelio Mateo-Alonso
Summary: This study demonstrates that twisted molecular nanoribbons can self-assemble into ordered gels, and their morphologies and sol-gel transitions vary with the length of the nanoribbons. The nanoribbon gels also exhibit red fluorescence and pseudoconductivity values in the same range as current state-of-the-art gels.
Article
Engineering, Electrical & Electronic
M. S. Zaini, M. A. Mohd Sarjidan, W. H. Abd Majid
Summary: The study investigated the impact of trap density on the parameters R-n and R-n' of double-carrier organic light-emitting devices. By increasing the trap density, the simulation results demonstrated a strong influence on the device characteristics, with OLED B showing higher trap density luminescence at a lower turn-on voltage, as predicted.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Energy & Fuels
Espen Doedens, E. Markus Jarvid, Raphael Guffond, Yuriy V. Serdyuk
Article
Physics, Applied
Yuesheng Zheng, Huifen Huang, Xiaoyan Zhong, Yuriy Serdyuk
Summary: This study investigates the effect of nano-fillers on charge transport characteristics in PP composites under DC electric fields, confirming that nano-fillers can significantly improve the electric field distribution and suppress the bulk current in the material. The results provide a theoretical basis for tailoring PP-based composites for specific applications by controlling nano-fillers.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Sarath Kumara, Yuriy Serdyuk, Marc Jeroense
Summary: This paper compares different models used for calculating electric field distributions in HVDC cable insulation and finds that models based on a microscopic approach are better at predicting the accumulation of homo- and hetero-charge in the insulation.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Engineering, Electrical & Electronic
Sarath Kumara, Thomas Hammarstrom, Yuriy Serdyuk
Summary: This study examines the impact of applied voltage polarity on DC tree inception in XLPE by analyzing dissipated and stored electric energies. Simulations were conducted for three modes of DC tree initiation: continuous DC voltage, grounding pre-stressed samples, and polarity reversal. The results indicate that the dissipated and stored energy levels play a crucial role in determining the polarity effect on DC tree inception.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Engineering, Electrical & Electronic
Mohammad Kharezy, Hassan Reza Mirzaei, Yuriy Serdyuk, Torbjorn Thiringer, Morteza Eslamian
Summary: The study presents a prototype of a 50 kW oil-paper insulated Medium Frequency Transformer (MFT) designed for connecting wind turbines to DC/DC converters to reduce the size of transformer stations. This solution requires MFTs to be insulated against high DC voltage to withstand the voltage in limited space.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Energy & Fuels
Mohammad Kharezy, Hassan Reza Mirzaei, Torbjorn Thiringer, Yuriy Serdyuk
Summary: This study proposes a compact solution for an energy collection system that reduces the need for offshore platforms and introduces an environmentally friendly HV insulation system using pressboard and biodegradable oil.
Article
Engineering, Electrical & Electronic
Zijun Pan, Cheng Pan, Ju Tang, Boli Hu, Yi Luo, Yuriy Serdyuk
Summary: This study investigated the surface charge accumulation on silicon carbide (SiC)/epoxy coatings with different contents of SiC filler (3%, 5%, 7%, and 10%). The results showed that different patterns of charge distribution appeared on the material surface depending on the contact type, charging duration, and filler content.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Engineering, Electrical & Electronic
Zijun Pan, Cheng Pan, Ju Tang, Boli Hu, Yi Luo, Yuriy Serdyuk
Summary: This article investigates the dissipation of predeposited surface charges on SiC/epoxy coated insulators. Similar to Part I, the analysis considers a system of finger-shaped metallic electrodes on flat material samples with different types of material precharging. The study examines two cases based on different types of electrode-sample contacts as well as surface charging by external corona. The results show that the rate of charge dissipation is influenced by the content of SiC filler in the coating material.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Engineering, Electrical & Electronic
Yao Zhou, Yujie Zhu, Chao Yuan, Qi Li, Xiangdong Xu, Yuriy Serdyuk, Qing Wang, Jinliang He
Summary: This study demonstrates the efficient suppression of space charge accumulation in polymer nanocomposites by introducing local deep traps at nanoparticle/polymer interfaces. The local interfacial deep traps are directly observed at the nanoscale. This work provides a deeper understanding of the interfacial effects in polymer nanocomposites and enables the rational design of interfaces for high-performance insulation materials.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Engineering, Electrical & Electronic
Yao Zhou, Yujie Zhu, Chao Yuan, Qi Li, Xiangdong Xu, Yuriy Serdyuk, Qing Wang, Jinliang He
Summary: This study improves the high-temperature insulation properties of polypropylene-based nanocomposites by modulating the polymer/nanoparticle interfaces, providing new opportunities for designing high-performance recyclable insulation materials for HVdc cables.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Multidisciplinary
Babak Khanzadeh, Torbjorn Thiringer, Yuriy V. Serdyuk
Summary: This article presents control strategies to improve the performance of a 3-phase Delta Y-connected dual-active-bridge (DAB) dc-dc converter at partial loads. By adjusting the duration of the zero-level voltage on the Y-side and externally controlling the Delta-side dc-link voltage, the RMS current can be significantly reduced and the turn-on and turn-off currents of the switches can be lowered. Combining the reduction in Delta-side dc-link voltage with Y-side duty cycle variation can lead to considerable performance improvements.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Yilong Wang, Yuesheng Zheng, Yuriy Serdyuk
Summary: The AC breakdown characteristics of nitrogen in electric fields with different degrees of non-uniformity were investigated using a sphere-plane electrode system. The study found that the breakdown voltages followed Paschen's law at field factors below a certain threshold, but deviations occurred when the field factor exceeded this value. The relationship between the breakdown voltage and the product of pressure and gap distance also changed under different conditions. The results showed that the breakdown strength of nitrogen was higher than that of ambient air at certain field factor values.
Proceedings Paper
Energy & Fuels
Babak Khanzadeh, Yuriy Serdyuk, Torbjorn Thiringer
Summary: This paper provides closed-form formulas for estimating the core losses of three-phase transformers excited with multi-level converters for dual active bridge (DAB) applications. The effect of different winding configurations on the estimated losses is studied. The formulas are validated with MATLAB simulations, and their applicability for three-phase multi-level DAB converters is investigated.
2022 24TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'22 ECCE EUROPE)
(2022)
Proceedings Paper
Energy & Fuels
Babak Khanzadeh, Torbjorn Thiringer, Yuriy Serdyuk
Summary: The paper investigates the harmonic content in the phase voltages and currents of a three-phase multi-level DAB converter, studying the impact of windings connection on the harmonic content. It is found that for the Delta Y type, the lower the load level, the higher the share of harmonics in the waveform. A control strategy is proposed to effectively reduce low-order harmonics in partial loads for the Delta Y type.
2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)
(2022)
Article
Materials Science, Multidisciplinary
Sarath Kumara, Amir Masoud Pourrahimi, Azadeh Soroudi, Xiangdong Xu, Thomas Hammarstrom, Yuriy Serdyuk, Christian Muller
Summary: The study evaluates the thermal aging stability of a copolymer blend cured through click chemistry reactions. It is observed that the addition of suitable antioxidants prevents thermo-oxidative degradation of the polyethylene backbone. Furthermore, the material maintains its thermal and mechanical properties during aging.
MATERIALS ADVANCES
(2022)
