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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Electrical and Electronic Material Engineers
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical and Electronic Material Engineers
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Volume & Issues
Volume 27, Issue 12 - Dec 2014
Volume 27, Issue 11 - Nov 2014
Volume 27, Issue 10 - Oct 2014
Volume 27, Issue 9 - Sep 2014
Volume 27, Issue 8 - Aug 2014
Volume 27, Issue 7 - Jul 2014
Volume 27, Issue 6 - Jun 2014
Volume 27, Issue 5 - May 2014
Volume 27, Issue 4 - Apr 2014
Volume 27, Issue 3 - Mar 2014
Volume 27, Issue 2 - Feb 2014
Volume 27, Issue 1 - Jan 2014
Selecting the target year
Properties of the ZnS Thin Film Buffer Layer by Chemical Bath Deposition Process with Different Solution Concentrations and Deposition Time
Son, Kyeongtae ; Kim, Jongwan ; Kim, Minyoung ; Shin, Junchul ; Jo, Sunghee ; Lim, Donggun ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 269~275
DOI : 10.4313/JKEM.2014.27.5.269
In this study, chemical bath deposition method was used to grow Zinc sulfide(ZnS) thin films from
. ZnS thin films have been prepared onto ITO glass. The concentrations of
were varied while the concentration of Thiourea was fixed in 0.52 M. Structural, optical, electrical characteristic of ZnS thin films were measured. The physical and optical properties of different ZnS thin films were influenced severely by the concentration of the two reacting chemicals. The optimal concentration of
was 0.085 M and 1.6 M, respectively.
Metal-Oxide-Semiconductor Photoelectric Devices
Kang, Kilmo ; Yun, Ju-Hyung ; Park, Yun Chang ; Kim, Joondong ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 276~281
DOI : 10.4313/JKEM.2014.27.5.276
A high-responsive Schottky device has been achieved by forming a thin metal deposition on a Si substrate. Two-different metals of Ni and Ag were used as a Schottky metal contact with a thickness about 10 nm. The barrier height formation between metal and Si determines the rectifying current profiles. Ag-embedding Schottky device gave an extremely high response of 17,881 at a wavelength of 900 nm. An efficient design of Schottky device may applied for photoelectric devices, including photodetectors and solar cells.
Effect of Deposition Temperature on the Electrical Performance of SiZnSnO Thin Film Transistors Fabricated by RF Magnetron Sputtering
Ko, Kyung Min ; Lee, Sang Yeol ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 282~285
DOI : 10.4313/JKEM.2014.27.5.282
We have investigated the structural and electrical properties of Si-Zn-Sn-O (SZTO) thin films deposited by RF magnetron sputtering at various deposition temperatures from RT to
. All the SZTO thin fims are amorphous structure. The mobility of SZTO thin film has been changed depending on the deposition temperature. SZTO thin film transistor shows mobility of 8.715
at room temperature. We performed the electrical stress test by applying gate and drain voltage. SZTO thin film transistor shows good stability deposited at room temperature while showing poor stability deposited at
. As a result, the electrical performance and stability have been changed depending on deposition temperature mainly because high deposition temperature loosened the amorphous structure generating more oxygen vacancies.
A Study on the Torque Characteristics Depending on the Elastic Body Materials of a Hexadecagon Shaped Ultrasonic Motor
Cheon, Seong-Kyu ; Jeong, Seong-Su ; Lee, Byung-Ha ; Ha, Yong-Woo ; Kim, Myong-Ho ; Park, Tae-Gone ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 286~291
DOI : 10.4313/JKEM.2014.27.5.286
In this study, novel ultrasonic rotary motor of hexadecagon shape stator was proposed. Stator of the hexadecagon ultrasonic motor was composed of an elastic ring and ceramics. The elastic ring had sixteen sides and sixteen angular points. Eight ceramics were attached on the outer surface of the eight sides of the ring. When rotor of cylindrical shaft was inserted inside of the ring stator, central lines of the sixteen sides of the stator hold the shaft by the slight pressures(frictions). This slight pressure was a preload of the motor and it could be controlled by radius and thickness of the ring. When two sinusoidal voltages which have 90 degree phase difference were applied to each four ceramics, elliptical displacements of inner surface of the ring were obtained. These elliptical displacements of the inner surface rotated the shaft rotor through the frictions. The proposed hexadecagon ultrasonic motor was designed and analyzed by using the finite element method (FEM), depending on materials of the elastic ring. Based on the FEM results, one model of motor which showed maximum displacement at contact points was chosen and fabricated. And characteristics of the motor were compared with simulated results. When the motor was fabricated with these results, EL20ET0.5CT0.5CW2 model showed 115[rpm] speed about input voltage of 60[Vrms] at 65.6[kHz]. And the maximum torque of 6[gfcm] was obtained. From these results, the hexadecagon shaped ultrasonic motor can be used to actuator for optical device which needs detailed position control. Also it can be used to medical and portable device by reducing size and weight.
Effect of Ta Doping on Piezoelectric Properties of Lead-Free (K
Kang, Jin-Kyu ; Lee, Yong-Hui ; Heo, Dae-Jun ; Lee, Hyun-Young ; Dinh, Thi Hinh ; Lee, Jae-Shin ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 292~296
DOI : 10.4313/JKEM.2014.27.5.292
We investigated the effect of Ta doping on the dielectric and piezoelectric properties of lead-free
ceramics prepared using a conventional ceramic processing. X-ray diffraction analysis revealed that Ta was perfectly substituted into Nb-sites in the range of 0 to 20 at%. As Ta content in the KNN increased, the sinterability of KNN ceramics was significantly degraded while the Ta doping enhanced the piezoelectric constant
, planar mode piezoelectric coupling coefficient (
), and electromechanical quality factor (
). The highest values for
was found to be 156 pC/N, 0.37, and 155, respectively.
Growth of ZnSnO
Thin Films on c-Al
(0001) Substrate by Pulsed Laser Deposition
Manh, Trung Tran ; Lim, Jae-Ryong ; Yoon, Soon-Gil ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 297~302
DOI : 10.4313/JKEM.2014.27.5.297
(LSCO) electrode thin films with a resistivity of ~ 1,600
were grown on c-
(ZTO) thin films with different thicknesses were directly grown on LSCO/c-
(0001) substrates at a substrate temperature that ranged from 550 to
using Pulsed Laser Deposition (PLD). The secondary phase
occurred during the growth of ZTO films and it became more significant with further increasing substrate temperature. Polarization-electric-field (P-E) hysteresis characteristics, with a remnant polarization and coercive field of 0.05
and 48 kV/cm, respectively, were obtained in the ZTO film grown at
in 200 mTorr.
Enhanced Electro-optical Characteristics of Liquid Crystal Shutter with a Dual Frequency Liquid Crystal Material
Kim, Dae Soo ; Han, Seung Hwan ; Bae, Geon ; Jhun, Chul Gyu ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 303~306
DOI : 10.4313/JKEM.2014.27.5.303
In this paper, by using a dual frequency liquid crystal material, we propose a liquid crystal device with a fast response characteristics. The dual frequency liquid crystal material has a positive dielectric anisotropy value at a low frequency. With a high frequency, the dielectric anisotropy becomes negative. Therefore, the relaxation process is governed by not only the elastic deformation, but also the dielectric interaction. The measured decay time and rise time were 0.88 ms and 0.33 ms, respectively.
Improvement of Outcoupled Light Efficiency of Organic Light-emitting Diodes with a Use of Microlens Array
Kim, Hye Sook ; Hwang, Deok Hyeon ; Hong, Jin Woong ; Song, Min Jong ; Han, Wone Keun ; Kim, Tae Wan ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 307~311
DOI : 10.4313/JKEM.2014.27.5.307
Because of a waveguiding effect and total internal reflection caused by a difference in refractive indices, only 20% of generated light is emitted to the air and the rest is trapped or absorbed in the device. An improvement of outcoupled efficiency of organic light-emitting diodes was studied using a microlens array. Mold of microlens array was fabricated by using photo-lithography with the AZ9260 photoresist, and the microlens array was formed onto the glass substrate using the UV curing agent named ZPU13-440. Device structure consists of microlens/glass/ITO/TPD/
/LiF/Al. It was found that there is an improvement of external quantum efficiency by about 20% at the same current density for the device with the microlens array compared to that of the reference one. Simulated outcoupled efficiency shows the improvement by about 20% for the device with the microlens array compared to that of the reference one. These results are consistent with the experimental ones.
A Study on Electron Emission Characteristics of Photocathode Formed Under Condition in N
Jeong, Hyo-Soo ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 312~316
DOI : 10.4313/JKEM.2014.27.5.312
Photoemission is a process in which photons are converted into free electrons. Photocathodes are the typical materials for the process. They emit electrons when a light is irradiated upon. The traditional method of manufacturing photocathodes is complicated, requires specialized equipment, and is limited very small sized samples.
photocathode was formed on a substrate in
atmospheric conditions. The photocathode formation was a gas phase reaction with the substrate. Vacuum devices were made to test electron emission characteristics of the formed photocathode. Visible light of wavelength 475 nm was used for the primary light source. The results showed high current density and long term stability of the photoelectron emission.
Growth Characteristics of the ZnO Nanowires Prepared by Hydrothermal Synthesis Technique with Applied DC Bias
Lim, Young-Taek ; Shin, Paik-Kyun ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 317~321
DOI : 10.4313/JKEM.2014.27.5.317
Hydrothermal synthesis technique could be carried out for growth of ZnO nanowires at relatively low process temperature, and it could be freely utilized with various substrates for fabrication process of functional electronic devices. However, it has also a demerit of relatively slow growth characteristics of the resulting ZnO nanowires. In this paper, an external DC bias of positive and negative 0.5 [V] was applied in the hydrothermal synthesis process for 2~8 [h] to prepare ZnO nanowires on a seed layer of AZO with high electrical conductivity. Growth characteristics of the synthesized ZnO nanowires were analyzed by FE-SEM. Material property of the grown ZnO nanowires was examined by PL analysis. The ZnO nanowires grown with positive bias revealed distinctively enhanced growth characteristics, and they showed a typical material property of ZnO.
Degradation Diagnosis of Overhead Power Lines Using Eddy Current Technology
Kim, Chng-Hyeok ; Kim, Tag-Yong ; Oh, Yong-Cheul ; Choi, Woon-Sik ; Jo, Choon-Nam ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 322~327
DOI : 10.4313/JKEM.2014.27.5.322
Internal corrosion of the distribution line can be detected in order to develop techniques of non-destructive inspection methods that operate only on the metal track eddy current diagnosis is possible by applying the technique investigated. Sensor for the production of a finite element method modeled by using an eddy current sensor, a distribution line by using an accelerated aging samples of sodium hydroxide was prepared. Sheathed cables for internal corrosion studies detected using an eddy current sensor is considered to be possible.
Determination of Optimal Combination of Optical Filter for Recognizing Financial Account Using Statistical Analysis
Yu, Hyeung Keun ; Lee, Kang Won ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 27, issue 5, 2014, Pages 328~341
DOI : 10.4313/JKEM.2014.27.5.328
The object of this paper is to develop optimal optical filter, which can be used to identify the financial account and read the information. The five factors which affect the performance of the optical filter are identified as optical glass type, existence of Fe, Photo pic coating type, and coating form. In this study we seek to determine the optimal combination for the best design of the optical filter. For each combination, the performances of optical filter are investigated using the proper experimental equipments and methods. White-state voltage, black-state voltage, and black-state error rate are used for the performance measures. Through the statistical analysis of the performance data collected, we have determined the optimal design of the optical filter.