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Surfactant-Mediated Molecular Beam Epitaxy of ZnO
H. Suzuki,G. Fujimoto,M. W. Cho,T. Yao,T. Minegishi 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
We investigated the effects of atomic hydrogen as a surfactant for plasma-assisted molecular beam epitaxial growth of ZnO. Atomic hydrogen was provided by dissociation of hydrogen gas, and ZnO films were grown on Zn-polar ZnO substrates. The growth mode was observed by using reflected high-energy electron diffraction (RHEED) and the presence of atomic hydrogen enhanced two-dimensional growth. Without atomic hydrogen, ZnO homoepitaxial growth directly on ZnO substrate showed a three-dimensional growth mode. Employing a low-temperature ZnO buffer layer (LT-ZnO) enabled a two-dimensional growth mode. However, with atomic hydrogen, twodimensional growth mode was achieved without using LT-ZnO. Low-temperature epitaxial growth was also achieved. Atomic force microscopy (AFM) measurements showed that the surfaces of ZnO films grown with atomic hydrogen were quite smooth. The structural and the optical properties were characterized using high resolution X-ray diffraction and photoluminescence. Theses properties were improved by atomic hydrogen irradiation. Thus, hydrogen acts an effective surfactant to enhance the layer by layer growth mode.
T. Minegishi,Z. Vashaei,G. Fujimoto,H. Suzuki,K. Sumitani,M. Cho,M. Suemitsu,O. Sakata,S. Tokairin,T. Yao,Y. Narita 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
We studied ZnO growth on 3C-SiC(001)/Si(001) templates. In-situ reflection high- energy electron diffraction (RHEED) observations implied that ZnO grown on 3C-SiC(001) had a critical thickness (50 nm). From a structural characterization by using X-ray diffraction, we revealed that ZnO films thinner than the critical thickness grown on 3C-SiC(001) had a [10-11] orientation with 4-fold in-plane symmetry. On the other hand, ZnO films thicker than the critical thickness consisted of [10-11] and [0001] orientations. Also, the portion of [0001] oriented ZnO increased with the layer thickness. Possible interface configurations of ZnO(10-11)/3C-SiC(001) and ZnO(0001)/ZnO(10-11) are suggested.
Anisotropic X-ray Rocking Curve Due to a Damaged Surface Layer in a Freestanding GaN Thick Film
seunghwan Park,jiho Chang,dongchoel Oh,G. Fujimoto,H. Goto,Hideyuki Suzuki,Takafumi Yao,Takashi Hanada,Tsutomu Minegishi,wookhyun Lee 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
The structural deformation of freestanding GaN film has been investigated. The specimen was grown on an Al2O3 substrate by using hydride vapor phase epitaxy (HVPE) and was self-detached during the growth. the atomic force microscopy (AFM) image showed much mechanical damages on the surface, which was presumably generated by the surface polishing process. After chemical etching, the near-band-edge to yellow-band (NBE/YB) luminescence intensity ratio was greatly increased. Also, using high resolution X-ray diraction (HRXRD), we found that the 2-! scan of (0002) reflection asymmetrically broadened at low diraction angles, which indicated that a damaged surface layer existed in the film with residual compressive strain. Moreover, a more detailed X-ray analysis showed that the surface had a concave curvature. We concluded that structural distortion of GaN could induce a serious deformation, which could aect not only the structural but also the optical and the electrical properties of the film.
Choi, M.,Kadara, H.,Zhang, J.,Parra, E.R.,Rodriguez-Canales, J.,Gaffney, S.G.,Zhao, Z.,Behrens, C.,Fujimoto, J.,Chow, C.,Kim, K.,Kalhor, N.,Moran, C.,Rimm, D.,Swisher, S.,Gibbons, D.L.,Heymach, J.,Kaf Elsevier 2017 Annals of oncology Vol.28 No.1
<P>Conclusion(s): Our findings pinpoint mutated genes that may impact clinical outcome as well as personalized strategies for targeted immunotherapies in early-stage LUSC.</P>
Kadara, H,Choi, M,Zhang, J.,Parra, E.R.,Rodriguez-Canales, J.,Gaffney, S.G.,Zhao, Z.,Behrens, C.,Fujimoto, J.,Chow, C.,Yoo, Y.,Kalhor, N.,Moran, C.,Rimm, D.,Swisher, S.,Gibbons, D.L.,Heymach, J.,Kafta Elsevier 2017 ANNALS OF ONCOLOGY Vol.28 No.1
<P>Conclusion(s): Our study highlights molecular and immune phenotypes that warrant further analysis for their roles in clinical outcomes and personalized immune-based therapy of LUAD.</P>