http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
기상이동법으로 성장한 산화아연 나노막대의 포토루미네슨스 분석
김소아람 ( So A Ram Kim ),조민영 ( Min Young Cho ),남기웅 ( Gi Woong Nam ),김민수 ( Min Su Kim ),김도엽 ( Do Yeob Kim ),임광국 ( Kwang Gug Yim ),임재영 ( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.10
ZnO nanorods were grown on Au-coated Si substrates by vapor phase transport (VPT) at the growth temperature of 600℃ using a mixture of zinc oxide and graphite powders as source material. Au thin films with the thickness of 5 nm were deposited by ion sputtering. Temperature-dependent photoluminescence (PL) was carried out to investigate the optical properties of the ZnO nanorods. Five peaks at 3.363, 3.327, 3.296, 3.228, and 3.143 eV, corresponding to the free exciton (FX), neutral donor bound exciton (DoX), first order longitudinal optical phonon replica of free exciton (FX-1LO), FX-2LO, and FX-3LO emissions, were obtained at low-temperature (10 K). The intensity of these peaks decreased and their position was red shifted with the increase in the temperature. The FX emission peak energy of the ZnO nanorods exhibited an anomalous behavior (red-blue-red shift) with the increase in temperature. This is also known as an "S-shaped" emission shift. The thermal activation energy for the exciton with increasing temperature in the ZnO nanorods is found to be about 26.6 meV; the values of Varshni`s empirical equation fitting parameters are = 5×10(-4) eV/K, β = 350 K, and E(g)(0) = 3.364 eV.
졸겔 스핀코팅 방법으로 제작된 ZnO 박막에서 Li 원자들이 물성에 미치는 영향
김영규 ( Young Gyu Kim ),박형길 ( Hyung Gil Park ),지익수 ( Ik Soo Ji ),김소아람 ( So A Ram Kim ),김종수 ( Jong Su Kim ),김진수 ( Jin Soo Kim ),김양수 ( Yang Soo Kim ),임재영 ( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.5
Undoped and Li-doped ZnO(LZO) thin films were grown on quartz substrates by a sol-gel spin- coating method. The effects of Li contents on the structural and optical properties of the ZnO thin flims were investigated by X-ray diffraction (XRD), photoluminescence (PL), and ultraviolet-visible spectrophotometer. In the XRD investigation, undoped and LZO thin films had a wurtzite structure and high c-axis orientation. The intensity and the full width at half maximum (FWHM) of the (002) peak for LZO was the largest and smallest at 2.5 at%, which indicate that the LZO thin film is the most crystalline at 2.5 at%. In the PL investigation, the near band edge emissions of the LZO thin films were blue-shifted and the FWHM of the LZO thin films decreased with increasing Li doping concentrations.
논문 : Sol-Gel 방법으로 제작된 Cd(x)Zn(1-x)O 박막의 조성비에 따른 구조적 및 광학적 특성
천민종 ( Min Jong Cheon ),김소아람 ( So A Ram Kim ),남기웅 ( Gi Woong Nam ),임광국 ( Kwang Gug Yim ),김민수 ( Min Su Kim ),임재영 ( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
Cd(x)Zn(1-x)O thin films were grown on quartz substrates by using the sol-gel spin-coating method. The mole fraction, x, of the Cd(x)Zn(1-x)O thin films was controlled from 0 to 1 by changes in the content ratio of the cadmium acetate dehydrate [Cd(CH3COO)2·(2H)2O] and zinc acetate dehydrate [Zn(CH3COO)2·(2H)2O]. The effects of the mole fraction on the morphological, structural, and optical properties of the Cd(x)Zn(1-x)O thin films were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-visible spectroscopy. The Cd(x)Zn(1-x)O thin films exhibited the polygonal surface morphology and their grain size was increased ranging from 42.1 to 63.9 nm with the increase in the mole fraction. It was observed that the absorption bandgap of the Cd(x)Zn(1-x)O thin films decreased from 3.25 to 2.16 eV as the mole fraction increased and the Urbach energy (E(U)) values changed inversely to the optical bandgap of the Cd(x)Zn(1-x)O thin films.