Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions on Electrical and Electronic Materials
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical and Electronic Material Engineers
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Aug 2016
Volume 17, Issue 3 - Jun 2016
Volume 17, Issue 2 - Apr 2016
Volume 17, Issue 1 - Feb 2016
Selecting the target year
Design and Implementation of Modified Current Source Based Hybrid DC - DC Converters for Electric Vehicle Applications
Selvaganapathi, S. ; Senthilkumar, A. ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 57~68
DOI : 10.4313/TEEM.2016.17.2.57
In this study, we present the modern hybrid system based power generation for electric vehicle applications. We describe the hybrid structure of modified current source based DC - DC converters used to extract the maximum power from Photovoltaic (PV) and Fuel Cell system. Due to reduced dc-link capacitor requirement and higher reliability, the current source inverters (CSI) better compared to the voltage source based inverter. The novel control strategy includes Distributed Maximum Power Point Tracking (DMPPT) for photovoltaic (PV) and fuel cell power generation system. The proposed DC - DC converters have been analyzed in both buck and boost mode of operation under duty cycle 0.5>d, 0.5<d<1 and 0.5<d for capable electric vehicle applications. The proposed topology benefits include one common DC-AC inverter that interposes the generated power to supply the charge for the sharing of load in a system of hybrid supply with photovoltaic panels and fuel cell PEM. An improved control of Direct Torque and Flux Control (DTFC) based induction motor fed by current source converters for electric vehicle.In order to achieve better performance in terms of speed, power and miles per gallon for the expert, to accepting high regenerative braking current as well as persistent high dynamics driving performance is required. A simulation model for the hybrid power generation system based electric vehicle has been developed by using MATLAB/Simulink. The Direct Torque and Flux Control (DTFC) is planned using Xilinx ISE software tool in addition to a Modelsim 6.3 software tool that is used for simulation purposes. The FPGA based pulse generation is used to control the induction motor for electric vehicle applications. FPGA has been implemented, in order to verify the minimal error between the simulation results of MATLAB/Simulink and experimental results.
Dielectric and Electro-Optical Properties of Ceramic Nanoparticles Doped Liquid Crystals
Porov, Preeti ; Chandel, Vishal Singh ; Manohar, Rajiv ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 69~78
DOI : 10.4313/TEEM.2016.17.2.69
Liquid crystals are important materials because of their applications in display technology and many other scientific applications. Different mixtures of liquid crystals and their doped samples have gained interest because a single liquid crystal compound cannot fulfill all the required parameters for the display application. The doping can be accomplished with dyes, polymers, or composite nanoparticles among other substance. The addition of nanoparticles can modify the physical properties of the host liquid crystal and enhances the performance of electro-optical devices. The present study is focused on investigations of possible changes in dielectric and electro optical properties of liquid crystals caused by doping with ceramic nanoparticles. Including smaller nanoparticles were found to be better candidates for use in suppressing the unwanted ion effects in liquid crystal displays.
A New Single-Stage Small Power MH lamp Electronic Ballast
Zhang, Xiaoqiang ; Zhang, Weiping ; Zhang, Mao ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 79~85
DOI : 10.4313/TEEM.2016.17.2.79
In this study, we proposed a new single-stage small power MH lamp electronic ballast and power-factor correction circuit with improved circuit by the current of passive power factor correction. Main circuit integrates traditional DC/DC and DC/AC circuits into one-stage DC/AC inverter. Moreover, we described the working principle and control strategy of the new circuit; it's soft switching principle; and resonant element parameter design formula. An experimental prototype of HID lamp electronic ballast with output power of 70 W was built to verify the feasibility of the analysis and design. The simulation and experimental results proved that the power factor of this circuit could reach 94%, with efficiency of 90%. The input current harmonics conform to IEC 61000-3-2 standards and its cost is low. These superior performances of the new circuit indicate certain practical values.
Multi-Dielectric & Multi-Band operations on RF MEMS
Gogna, Rahul ; Gaba, Gurjot Singh ; Jha, Mayuri ; Prakash, Aditya ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 86~91
DOI : 10.4313/TEEM.2016.17.2.86
Ever increasing demand for microwave operated applications has cultivated need for high-performance universal systems capable of working on multi-bands. This objective can be realized using Multi-Dielectrics in RF MEMS capacitive switch. In this study, we present a detailed analysis of the effect of various dielectrics on switch performance. The design consists of a capacitive switch and performance is analyzed by changing the dielectric layers beneath the switch. The results are obtained using three different dielectrics including Silicon nitride (7.6), Hafnium dioxide (25) and Titanium oxide (50). Testing of proposed switch yields high isolation (- 87.5 dB) and low insertion loss (- 0.1 dB at 50 GHz) which is substantially better than the conventional switches. The operating bandwidth of the proposed switch (DC to 95 GHz) makes it suitable for wide band microwave applications.
A Disparate Low Loss DC to 90 GHz Wideband Series Switch
Gogna, Rahul ; Jha, Mayuri ; Gaba, Gurjot Singh ; Singh, Paramdeep ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 92~97
DOI : 10.4313/TEEM.2016.17.2.92
This paper presents design and simulation of wide band RF microswitch that uses electrostatic actuation for its operation. RF MEMS devices exhibit superior high frequency performance in comparison to conventional devices. Similar techniques that are used in Very Large Scale Integration (VLSI) can be employed to design and fabricate MEMS devices and traditional batch-processing methods can be used for its manufacturing. The proposed switch presents a novel design approach to handle reliability concerns in MEMS switches like dielectric charging effect, micro welding and stiction. The shape has been optimized at actuation voltage of 14-16 V. The switch has an improved restoring force of 20.8 μN. The design of the proposed switch is very elemental and primarily composed of electrostatic actuator, a bridge membrane and coplanar waveguide which are suspended over the substrate. The simple design of the switch makes it easy for fabrication. Typical insertion and isolation of the switch at 1 GHz is -0.03 dB and -71 dB and at 85 GHz it is -0.24 dB and -29.8 dB respectively. The isolation remains more than - 20 db even after 120 GHz. To our knowledge this is the first demonstration of a metal contact switch that shows such a high and sustained isolation and performance at W-band frequencies with an excellent figure-of merit (fc=1/2.pi.Ron.Cu =1,900 GHz). This figure of merit is significantly greater than electronic switching devices. The switch would find extensive application in wideband operations and areas where reliability is a major concern.
Plasma Textured Glass Surface Morphologies for Amorphous Silicon Thin Film Solar Cells-A review
Hussain, Shahzada Qamar ; Balaji, Nagarajan ; Kim, Sunbo ; Raja, ayapal ; Ahn, Shihyun ; Park, Hyeongsik ; Le, Anh Huy Tuan ; Kang, Junyoung ; Yi, Junsin ; Razaq, Aamir ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 98~103
DOI : 10.4313/TEEM.2016.17.2.98
The surface morphology of the front transparent conductive oxide (TCO) films plays a vital role in amorphous silicon thin film solar cells (a-Si TFSCs) due to their high transparency, conductivity and excellent light scattering properties. Recently, plasma textured glass surface morphologies received much attention for light trapping in a-Si TFSCs. We report various plasma textured glass surface morphologies for the high efficiency of a-Si TFSCs. Plasma textured glass surface morphologies showed high rms roughness, haze ratio with micro- and nano size surface features and are proposed for future high efficiency of a-Si TFSCs.
Correlation between the Annealing Effect and the Electrical Characteristics of the Depletion Region in ZnO, SnO
and ZTO Films
Oh, Teresa ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 104~108
DOI : 10.4313/TEEM.2016.17.2.104
To research the correlation between oxygen vacancy and the electrical characteristics of ZTO, which is made by using a target mixed ZnO:SnO
=1:1, the ZnO, SnO
and ZTO were analyzed by PL, XPS, XRD patterns and electrical properties. It was compared with the electron orbital spectra of O 1s in accordance with the electrical characteristics of ZnO, SnO
and ZTO. The electrical characteristics of ZTO were improved by increasing the annealing temperatures, due to the high degree of crystal structures at a high temperature, and the physical properties of ZTO was similar to that of ZnO. The amorphous structure of SnO
was increased with increasing the temperature. The Schottky contact of oxide semiconductors was formed using the depletion region, which is increased by the electron-hole combination due to the annealing processes. ZnO showed the Ohmic contact in spite of a high annealing temperature, but SnO
and ZTO had Schottky contact. As such, it was confirmed that the electrical properties of ZTO are affected by the molecules of SnO
Solution-Derived Amorphous Yttrium Gallium Oxide Thin Films for Liquid Crystal Alignment Layers
Oh, Byeong-Yun ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 109~112
DOI : 10.4313/TEEM.2016.17.2.109
We demonstrated an alternative electrically controlled birefringence liquid crystal (ECB-LC) system with ion beam (IB)-irradiated yttrium gallium oxide (YGaO) alignment films using a sol-gel process. The surface roughness of the films was dependent on the annealing temperature; aggregated particles on surface were observed at lower annealing temperatures, whereas a smooth surface could be obtained with higher annealing temperatures. Higher transmittance in the visible region was observed at higher annealing temperatures. The film had an amorphous crystallographic state irrespective of the annealing temperature. Furthermore, ECB-LC cell with our IB-irradiated YGaO film yielded faster response time when compared to ECB-LC cell with rubbed polyimide. Considering the fast response time and high transmittance, the IB-irradiated YGaO-base LC system is a powerful alternative application for the liquid crystal display industry.
Reverse-bias Leakage Current Mechanisms in Cu/n-type Schottky Junction Using Oxygen Plasma Treatment
Kim, Hogyoung ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 113~117
DOI : 10.4313/TEEM.2016.17.2.113
Temperature dependent reverse-bias current-voltage (I-V) characteristics in Cu Schottky contacts to oxygen plasma treated n-InP were investigated. For untreated sample, current transport mechanisms at low and high temperatures were explained by thermionic emission (TE) and TE combined with barrier lowering, respectively. For plasma treated sample, experimental I-V data were explained by TE or TE combined with barrier lowering models at low and high temperatures. However, the current transport was explained by a thermionic field emission (TFE) model at intermediate temperatures. From X-ray photoemission spectroscopy (XPS) measurements, phosphorus vacancies (VP) were suggested to be generated after oxygen plasma treatment. V
possibly involves defects contributing to the current transport at intermediate temperatures. Therefore, minimizing the generation of these defects after oxygen plasma treatment is required to reduce the reverse-bias leakage current.
A Short Wavelength Coplanar Waveguide Employing Periodic 3D Coupling Structures on Silicon Substrate
Yun, Young ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 118~120
DOI : 10.4313/TEEM.2016.17.2.118
A coplanar waveguide employing periodic 3D coupling structures (CWP3DCS) was developed for application in miniaturized on-chip passive components on silicon radio frequency integrated circuits (RFIC). The CWP3DCS showed the shortest wavelength of all silicon-based transmission line structures that have been reported to date. Using CWP3DCS, a highly miniaturized impedance transformer was fabricated on silicon substrate, and the resulting device showed good RF performance in a broad band from 4.6 GHz to 28.6 GHz. The device as was 0.04 mm
in size, which is only 0.74% of the size of the conventional transformer on silicon substrate.
Influence of the Ag interlayer on the structural, optical, and electrical properties of ZTO/Ag/ ZTO films
Gong, Tae-Kyung ; Moon, Hyun-Joo ; Kim, Daeil ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 121~124
DOI : 10.4313/TEEM.2016.17.2.121
(ZTO) trilayer films were prepared on glass substrates by radio frequency (RF) and direct current (DC) magnetron sputtering. The electrical resistivity and optical transmittance of the films were investigated as a function of the Ag interlayer thickness. ZTO films with a 15 nm thick Ag interlayer show the highest average visible transmittance (83.2%) in the visible range. In this study, the highest figure of merit (2.1×10
Ω cm) is obtained with the ZTO 50 nm/Ag 15 nm/ZTO 50 nm films. The enhanced optical and electrical properties of ZTO films with a 15 nm thick Ag interlayer are attributed to the crystallization of the Ag interlayer, as supported by the distinct XRD pattern of the Ag (111) peaks. From the observed results, higher optical and electrical performance of the ZTO film with a 15 nm thick Ag interlayer seems to make a promising alternative to conventional transparent conductive ITO films.
Characterization of TiO
quantum dots synthesized by hydrothermal method
Shim, Young-Jae ; Choi, Gyoung-Jin ;
Transactions on Electrical and Electronic Materials, volume 17, issue 2, 2016, Pages 125~127
DOI : 10.4313/TEEM.2016.17.2.125
quantum dots were synthesized by a hydrothermal method after precipitating titanium hydroxide using Ti(SO
and NaOH solutions. A simple hydrothermal apparatus was manufactured in the laboratory and operated at temperature 100℃, 130℃, and 160℃. Spherical, uniform, and non-aggregated approximately 15 nm in size TiO
quantum dots were obtained. Properties of synthesized TiO
quantum dots were characterized using UV/Vis/NIR spectrophotometry, XRD diffractometry, and TEM.