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RF 마그네트론 스퍼터링법으로 성장 된 SnS 박막의 구조적 및 광학적 특성에 대한 증착 압력의 영향
손승익(Seung-Ik Son),이상운(Sang Woon Lee),손창식(Chang Sik Son),황동현(Donghyun Hwang) 한국태양광발전학회 2020 Current Photovoltaic Research Vol.8 No.1
Single-phased SnS thin films have been prepared by RF magnetron sputtering at various deposition pressures. The effect of deposition pressure on the structural and optical properties of polycrystalline SnS thin films was studied using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible-near infrared (UV-Vis-NIR) spectrophotometer. The XRD analysis revealed the orthorhombic structure of the SnS thin films oriented along the (111) plane direction. As the deposition pressure was increased from 5 mTorr to 15 mTorr, the intensity of the peak on the (111) plane increased, and the intensity decreased under the condition of 20 mTorr. The binding energy difference at the Sn 3d5/2 and S 2p3/2 core levels was about 324.5 eV, indicating that the SnS thin film was prepared as a pure Sn-S phase. The optical properties of the SnS thin films indicate the presence of direct allowed transitions with corresponding energy band gap in the rang 1.47-1.57 eV.
금과 니켈이 코팅된 베릴륨 구리에 다른 반복율을 적용한 레이저 드릴링 공정의 실험적 연구
손승익(Seungik Son),이동경(Dongkyoung Lee) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.3
Due to the development of technology and high-tech industrialization, various processing technologies requiring precision are developed and the high degree of precision is further required. Therefore, laser-aided manufacturing has been applied in many engineering fields due to many advantages. However, without understanding fundamental interaction characteristics, its advantages cannot be fully utilized. In this study, the interaction between laser and material is investigated by laser process applied with the different repetition. The wavelength of IR laser used in this experiment is 1064nm. the parameters of IR laser are laser power (20 W), repetition rate (105 kHz, 200 kHz), pulse duration (20 ns) and these parameters are constant during the laser drilling. In addition, the experiment is performed by increasing the laser total energy. For the component analysis of specimen and result of experiment, we use scanning electron microscope (SEM) and energy dispersive X-ray (EDX). And then the result of the Heat affected zone, Material removal zone and Burr is measured. Through this study, it seems that the interaction characteristic is controlled by repetition rate.