Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Crystal Growth and Crystal Technology
Journal Basic Information
Journal DOI :
The Korea Association of Crystal Growth
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Dec 2008
Volume 18, Issue 5 - Oct 2008
Volume 18, Issue 4 - Aug 2008
Volume 18, Issue 3 - Jun 2008
Volume 18, Issue 2 - Apr 2008
Volume 18, Issue 1 - Feb 2008
Selecting the target year
High resistivity Czochralski-grown silicon single crystals for power devices
Lee, Kyoung-Hee ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 137~139
Floating zone, neutron transmutation-doped and magnetic Czochralski silicon crystals are being widely used for fabrication power devices. To improve the quality of these devices and to decrease their production cost, it is necessary to use large-diameter wafers with high and uniform resistivity. Recent developments in the crystal growth technology of Czochralski silicon have enable to produce Czochralski silicon wafers with sufficient resistivity and with well-controlled, suitable concentration of oxygen. In addition, using Czoehralski silicon for substrate materials may offer economical benefits, First, Czoehralski silicon wafers might be cheaper than standard floating zone silicon wafers, Second, Czoehralski wafers are available up to diameter of 300 mm. Thus, very large area devices could be manufactured, which would entail significant saving in the costs, In this work, the conventional Czochralski silicon crystals were grown with higher oxygen concentrations using high pure polysilicon crystals. The silicon wafers were annealed by several steps in order to obtain saturated oxygen precipitation. In those wafers high resistivity over
cm is kept even after thermal donor formation annealing.
Effect of asymmetric magnetic fields on the interface shape in Czochralski silicon crystals
Hong, Young-Ho ; Shim, Kwang-Bo ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 140~145
Silicon single crystals are grown by Czochralski (CZ) method in different growing conditions. The different shapes of the crystal-melt interface are obtained with various magnetic fields. Effects of zero-Gauss plane (ZGP) shape and magnetic intensity (MI) on the crystal-melt interface in the crystal experimentally are investigated. The shape of ZGP is not only flat but also parabolic, which is due to magnetic ratio (MR) of the lower to upper current densities in the configurations of the cusp-magnetic fields. As the MR increases, the crystal-melt interface becomes more concave. It means that the hot melt can be easily transported to the crystal-melt interface with increasing the MR. Effective shape of the crystal-melt interface is found to depend on the magnetic field in cusp-magnetic CZ method. The experimental results are compared with other studies and discussed.
A basic study for color identification of amethyst by spectrophotometer
Yoon, Si-Nae ; Song, Young-Jun ; Yon, Seog-Joo ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 146~154
This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on cm xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.
Synthesis of free-standing ZnO/Zn core-shell micro-polyhedrons using thermal chemical vapor deposition
Choi, Min-Yeol ; Park, Hyun-Kyu ; Jeong, Soon-Wook ; Kim, Sang-Woo ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 155~159
In this work, we report synthesis of free-standing ZnO/Zn core-shell micro-polyhedrons using metal Zn pellets as a source material by the thermal chemical vapor deposition process. Scanning and transmission electron microscopy measurements were introduced to investigate morphologies and structural properties of as-grown ZnO/Zn core-shell micro-polyhedrons. It was found that micro-polyhedrons were composed of inner single-crystalline metal Zn surrounded by single-crystalline ZnO nanorod arrays. The inner single crystalline metal Zn with micro-scale diameter has a hexagonal crystal structure. Diameter and height of ZnO nanorods covering the metal Zn surface are below 10 nm and 100 nm, respectively. It was also confirmed that c-axis oriented ZnO nanorods are single crystalline with a hexagonal crystal structure.
Electrical and optical properties of doped indium tin oxide thin films for top emission organic light emission devices
Jung, C.H. ; Kang, Y.K. ; Yoon, D.H. ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 160~164
Insulating and conducting 12CaO
(Cl2A7)-doped indium tin oxide (ITO) (ITO:Cl2A7 insulator and electride) thin films were deposited on glass substrates by an RF magnetron co-sputtering method with increasing number of insulating and conducting Cl2A7 target chips. The structural, electrical and optical properties of these films were investigated. The carrier concentration decreased and resistivity increased in the films with increasing number of Cl2A7 target chips. The optical transmittance of all of the thin films was above 80 % in the visible wavelength range. The structural property and surface roughness of the films were examined and the decrease of crystallinity and surface roughness was strongly dependent on the change of grain size.
Preparation of Ta-doped
thin rums by co-sputtering and their photo-electrode properties
Yoon, Jong-Won ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 165~168
Ta-doped thin films were deposited on quartz and indium-tin oxide glass substrates using a co-sputtering method. The Ta-doped films formed a solid solution that induced structural changes from rutile to anatase phase. The anodic photocurrents of the Ta-doped
electrodes were observed not only in UV but also in the visible light range. The photocurrent response in visible light on Ta-doped
films are due to bandgap reduction.
Luminescence characterization of
red phosphor by rapid microwave heating synthesis
Park, W.J. ; Song, Y.H. ; Moon, J.W. ; Yoon, D.H. ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 169~173
phosphors were produced by a microwave heating process. When the microwave heating method was synthesized,. the particle size was very small and the particles tended to agglomerate. However, as the heating time increased, the particle size increased and the agglomeration decreased. The emission spectrum exhibited a weak band for
at 594.91 and 602.3 nm and strong sharp peaks at 616.7 and 620.0 nm due to the
. Microwave heating synthesis can provide a product without long time heating as well as good homogeneous distribution of activators.
Synthesis of nano-crystalline slaked lime using design of experiment
Kim, Jin-Seong ; Kim, Jung-Woo ; Lee, Hee-Soo ; Kim, Yong-Nam ; Shin, Hyun-Gyoo ; Kim, Hwan ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 18, issue 4, 2008, Pages 174~178
Nano-crystalline slaked lime was synthesized using design of experiment. In order to synthesize slaked lime, calcium chloride
and urea were used as starting materials. Calcium chloride solution and urea solution were mixed and heated in vessel that calcium carbonate was precipitated during heating. Precipitates were filtered, washed several times using D.I.water and ethanol and finally dried in oven. Slaked lime
has been fabricated by the hydration of calcined
. Design of experiment (Taguchi method) was used to optimize parameter, to minimize noise factors of experiment and to statistically analyze the results. Slaked lime having about 50 nm in optimized crystallite size could be obtained by calcination of
for 0.5 h and hydration with D.I water containing ethanol and oxalic acid.