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Deposition-Temperature Dependence of ZnO/Si Grown by Pulsed Laser Deposition
손창식,김영환,Homero Castaneda LOPEZ,최인훈,Ki Hyun YOON,Sang-Mun KIM,김성일,Yong Tae KIM 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We have investigated structural and optical properties of ZnO lms deposited on (100) Si substrates at various deposition temperatures by pulsed laser deposition. All the ZnO lms show columnar structure due to the growth behavior of ZnO; the (0001) plane has the fastest growth rate, but on increasing the deposition temperature the lm texture varies from c-axis orientation normal to substrate surface to random orientation. This tendency can be explained by the negative activation energy evaluated from growth rate as a function of inverse deposition temperature, which implies that ZnO lms are grown in a surface-kinetics-limited regime. FWHM of the UV-emission peak does not change at various deposition temperatures, and its mean value is about 115 meV. In contrast to FWHM, the intensity of UV emission drastically increases with increasing deposition temperature, due to the reduction of grain-boundary recombination effect.
Photoluminescence of Er-implanted GaN
손창식,Seong-Il Kim,Akihiro Wakahara,Homero Castaneda Lapez,Il-Ki Han,최인훈,Yong Tae Kim,Young-Hwan Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Visible green emission has been observed from Er(Erbium)-doped GaN epilayers. Various doses of Er ions were implanted in GaN epilayers by using ion implantation. The optical properties of Er-doped GaN were analyzed by using photoluminescence (PL). Sharp emission lines due to inner 4f shell transitions for Er3+ were observed in the PL spectrum of Er-implanted GaN. The emission spectrum consisted of two narrow green lines, 537 and 558 nm. The green emission lines were identied as Er3+ transitions from the 5H11=2 and the 4S3=2 levels to the 4I15=2 ground state. The stronger peaks in the 5 1014 cmက2 sample, together with the relatively higher intensity of the Er3+ luminescence in the lower doped sample, indicate that some damage remains in the 1 1015 cmက2 sample.
양원석 ( Wonseog Yang ),이재민 ( Jeamin Lee ),김창규 ( Changkyu Kim ),안승호 ( Seungho Ahn ),( Homero Castaneda ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.4
To improve corrosion resistance and reduce the hydrogen uptake of 22MnB5, up to 5% Mg was added to the AlSi coating of 22MnB5. After hot-stamping and electrocoating were done on the metallic-coated specimen, the surface characteristics of the steel, hydrogen uptake content, and corrosion resistance were examined by transmittance electron microscopy, thermal desorption spectrometry, cyclic corrosion testing, and electrochemical impedance spectroscopy. Mg was investigated as MgO on the surface layer after hotstamping while it existed as Mg<sub>2</sub>Si before hot-stamping. The total hydrogen content of 22MnB5 was decreased along with the Mg content. However, there was no difference at 0.2 wt% or more. When a small amount of Mg was added, the coating corrosion resistance was decreased, but when it was added at around 1.0 wt%, the greatest corrosion resistance increase was seen. However, when 3 wt% or more was added excessively, the corrosion resistance was decreased. MgO on the surface was considered to suppress H uptake by the AlSi melting solution and increase the barrier effect of the coating.