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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 14, Issue 12 - Dec 2001
Volume 14, Issue 11 - Nov 2001
Volume 14, Issue 10 - Oct 2001
Volume 14, Issue 9 - Sep 2001
Volume 14, Issue 8 - Aug 2001
Volume 14, Issue 7 - Jul 2001
Volume 14, Issue 6 - May 2001
Volume 14, Issue 5 - May 2001
Volume 14, Issue 4 - Apr 2001
Volume 14, Issue 3 - Mar 2001
Volume 14, Issue 2 - Feb 2001
Volume 14, Issue 1 - Jan 2001
Volume 12, Issue 4 - 00 2001
Selecting the target year
Effects of Applied Bias Conditions on Electrochemical Etch-stop Characteristics
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 263~268
This paper describes the effects of applied bias conditions on electrochemical etch-stop characteristics. THere are a number of key issues such as diode leakage and ohmic losses which arise when applying the conventional 3-electrochemical etch-stop to fabricated some of he MEMS(microelectro mechanical system) and SOI(Si-on-insulator) structures which employ SDB(Si-wafer direct bonding). This work allows to perform anin situ diagnostic to predict whether or not an electrochemical etch-stop would fail due to diode-leakage-induced premature passivation. In addition, it presents technology which takes into account the effects of ohmic losses and allows to calculate the appropriate bias necessary to obtain a successful electrochemical etch-stop.
A Study on the Fabrication
Volatile Material Thin Film by Pulsed Laser Deposition and he Confirmation of C-axis Orientation by X-ray Diffraction
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 269~273
W fabricated thin film using Na
volatile material by pulsed laser deposition (PLD) and studied characterization from EM, XRD, P-E. The density and scale of droplet, which is the defect of PLD, was investigated by SEM but large droplet was not found. The degree of assemble oriented C-axis measured with X-ray diffraction suggests that this film oriented C-axis achieved by
scan and rocking curves shows good self-assemble phenomenon, finally
-scan does that all of the four directions of the lattice in film equals to those of substrate. P-E hysteresis loop shows residual remnant polarization or saturation polarization value, but it is applicable to memories.ies.
High Temperature Characteristics of GaAs MESFETs for Maximum Transconductance
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 274~280
This paper presents transconductance (g
m/( characteristics of GaAs MESFET's at high temperatures ranging from room temperature to 350
. GaAs MESFET of 0.3x750[㎛] gate dimension has been used to obtain the experimental data. Gate to source voltage(V
GS/) has been controlled to obtain the temperature dependent characteristics for maximum transconductance g
mmax/ of the device. Furthermore g
mmax/ and expected g
m/ have been traced with temperatures ranging from room temperature to 350
also by compensating for C
GS/ to maintain the optimum operation of the device. From the results, V
GS/decreases as the operating temperature increases for optimum operation of the transconductance. Finally V
GS/ has been optimized to trace g
mmax/ and enhances the decreased g
m/ with different temperatures.
Electrical Properties of PZT Thin Films Deposited on the Ru/
Metal/Oxide Hybrid Electrodes
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 281~288
PZT thin films (3500
) have been prepard on the Ru/Ru
bottom electrodes with a RF magnetron sputtering system using P
ceramic target. Ru/Ru
bottom electrode was fabricated by in-situ processing controlled the
partial pressure. The PZT thin films deposited on the Ru/Ru
bottom electrode were preferred oriented (101) plane. The PZT thin films deposited on the Ru/Ru
bottom electrodes showed better electrical properties than those with Ru
bottom electrodes because Ru
prevented oxygen vacancies and impurities from existing withing the interface and substrate.e.
Electrical Characteristics of the Piezoelectric Transformer as a Function of Piezoelectric Properties and Load Variations
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 289~296
The piezoelectric transformers of 2.0x10x48 ㎣ size were fabricated with PSN-PMN-PZT(T10 and PNW-PMN-PZT(T2) composition ceramics. Effects of micro structural and piezoelectric properties on the electrical characteristics of the piezoelectric transformers were investigated. Under the fixed output power of 6 W, temperature rise of T1 transformer at the optimum load was smaller than T2 one because of fine grain size effect. Voltage step-up ratio of T1 transformer showed higher value than T2 one T1 transformer showed an excellent properties with voltage step-up ratio of 12.41, efficiency of 95.23% and temperature rise of 7.2
at 200㏀ load resistance. And also, T2 transformer showed an excellent properties with voltage step up ratio of 9.81, efficiency of 95.51% and temperature rise of 9
at 150㏀ load resistance.
The Temperature Distribution and Thermal Stress Analysis of Pole Mold transformer
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 297~301
In this paper, the temperature distribution and thermal stress analysis of 50kVA pole cast resin transformer for power distribution are investigated by FEM program. The one body molding model (Model 1) and air duct model (Model 2) are designed and their temperature distribution are analysed. The temperature rise value is about 105.5 deg in the model 1 and 65.28 de in the model 2. The temperature change of secondary winding is more than primary winding according to load ratio. The concentration part of Von Mises Stress occurs at interface between glass fiber and epoxy.
Humidity Sensitive Properties of Humidity Sensor Using Quaternized Cross-linked Copolymers of 4-Vinylpyridine
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 302~308
The polymers with various composition of 4-vinylpyridine (4-VP) with n-butyl acrylate (n-BA) and 2-hydroxypropyl methacrylate (HPMA) were synthesized as a humidity sensitive material and quaternized with 1.5-dibromopentane. Resistance versus relative humidity decreased with increase in the content of n-BA in the copolymer. The introduction of HPMA increased the resistance of the humidity sensor as well as enhanced the adherence to the alumina substrate. In the case of 4-VP/n-BA/HPMA=80/10.10, the hysteresis and temperature coefficient were
2%RH and -0.42∼0.46%RH/
. The average resistance at 30%RH, 60%RH and 90%RH are 3.1㏁, 155 ㏀ and 7.9 ㏀, respectively.
The Electrochemical Characterization of
Cathode Material - I. Crystal Structure and AC Impedance Properties of
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 309~315
powder was prepared by calcing the mixture of LiOH.
and MgO at
for 36h in an air atmosphere. The structure of
crystallites was analyzed from powder X-ray diffraction data as a cubic spinel, space group Fd3m. Though all cathode material showed spinel phase based on cubic phase in X-ray diffraction, other peaks gradually exhibited and became intense with increasing y value in
. However, ununiform which calculated by (111) face and (222) face was constant in spite of the increase of y value, except pure
. AC impedance of Li/
cells revealed the similar resistance of about
before cycling. In addition, The impedance of Li/
cell changed during charge and discharge or after cycling.
The Electrochemical Characterization of
Cathode Material - II. Charge and Discharge Property and Cyclic Voltametry of
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 316~322
(M=Zn and Mg) were obtained by reacting the mixture of LiOH.
and MgO ar ZnO at 80
for 36h in an air atmosphere. These materials showed an extended cycle life in lithium-anode cells working at room temperatue in a 3.0 to 4.3V potential window. Among these materials, LiM
showed the best cycle performance in terms of the capacity and cycle life. The discharge capacities of the cathode for the Li/LiM
cell at the 1st cycle and at the 70th cycle were about 120 and 105mAh/g, respectively. This cell capacity is retained by 88% after 70th cycle. In cyclic voltammetry measurement, all cells revealed tow oxidation peaks and reduction peaks. However, Li/
cell substituted with Zn and Mg showed new reaction peak during reduction reaction.eaction.ion.ion.
Electrochemical Properties of Conducting Polymer for Supercapacitor
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 323~327
The purpose of this study is to research and develop conducting polymer(CP) composite electrode for supercapacitor. The radius of semicircle of CP composite cell with polyaniline(PAn) composite electrode adding 30wt% acetylene black was small. The total resistance of supercapacitor cell mainly depended on internal resistance of he electrode. The discharge capacitance of supercapacitor cell with PAn composite electrode adding 30wt% acetylene black in 1st and 50th cycles was 27F/g and 31F/g at current density of 1mA/
, respectively. Supercapacitor cell with PAn composite electrode adding 30wt% acetylene black showed a good cycliability. Supercapacitor cell of CP composite electrode with 1M LiClO
/PC brings out god capacitor performance below 4V.
Electrical Characteristic of Ni-Cr-Al-Cu Alloy Thin Film Resistors
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 328~335
In this work, we made the precision thin film resistors of NiCr alloy (74wt%Ni-f18wt%Cr-4wt%Al-4wt%Cu) using DC/RF magnetron sputtering method and studied the sheet resistance and TCR(Temperature Coefficient of Resistance) etc... of the Ni-Cr-Al-Cu alloy thin film according to the change by annealing treatment to 400
in air and nitrogen atmosphere and the change(power, pressure, substrate temperature) of sputtering process.
Pretilt Angel Generation and Alignment Stability for Nematic Liquid Crystal Using a Photodimerization Method
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 336~340
We have investigated the generation of pretilt angle and alignment stability for a nematic liquid crystal (NLC) with obliquely polarized UV exposure on the three kinds of photo-polymer. High pretilt angle of the NLC was obtained by polarized UV exposure on a PM4Ch surface for 1 min. But, the low pretilt angle of he NLC on a PVCi surface was observed. The pretilt angle generated is attributed ot the photosensitivity by the long side chaining of photo-polymer. Also, a good thermal stability of the three kinds of photo-polymer were obtained by thermogravimetric analysis (TGA) measurement until 300
. Finally, the good LC aligning capabilities using the photodimerization method were observed by annealing-treatment until 150
Control of High Pretilt Angle Using the Photodimerization Method on the Photo-Crosslinkable Polymide Based Polymer
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 341~344
We synthesized a photo-crosslinkable polymide (polymide (PI)-chalcone-biphenyl (BP)) based polymer and control of pretilt angle for a nematic liquid crystal (NLC) using two kinds of the photodimerization methods by polarized UV exposure the photopolymer surfaces was studied. Pretilt angle of the NLCs using a conventional photodimerization method could be varied between 0
, by controlling the condition of UV exposure. Pretilt angle of the NLCs using the conventional photodimerization method was higher than a in-situ photodimerization method.
Normal Zone Propagation Properties of Bi-2223/Ag Tape and Prototype HTS Cable
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 14, issue 4, 2001, Pages 345~350
Normal zone propagaton(NZP) properties were investigated on Bi-223/Ag tapes and prototype HTS cable. NZP experiments in tape were conducted in temperatures from 45K to 77K in zero field. Prototype HTS cable was molded using epoxy and the experiments were carried out under adiabatic condition in LN
. NZP velocities in tapes with tow conditions of DC and AC currents were almost same at each temperature. NZP velocity in prototype HTS cable was 1.9-2.4 cm/sec in LN
. Numerical analysis was carried out by a one-dimensional equation of heat balance. The simulation results of NZP velocity in Bi-2223/Ag tapes were similar to the experimental results.