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Structural and Optical Characterizations of ZnO Films Grown by Reactive Electron Beam Evaporation 被引量:1
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作者 WU Hui-Zhen XU Xiao-ling +2 位作者 qiu dong-jiang HE Ke-Ming SHOU Xiang 《Chinese Physics Letters》 SCIE CAS CSCD 2000年第9期694-696,共3页
Low temperature epitaxial growth of ZnO films is achieved on Si(001)substrates by reactive electron beam evap oration.Growth temperature is varied from 125 C to 420 C and the optimum temperature is found between 200&#... Low temperature epitaxial growth of ZnO films is achieved on Si(001)substrates by reactive electron beam evap oration.Growth temperature is varied from 125 C to 420 C and the optimum temperature is found between 200°C and 300 C.X-ray diffraction shows that the ZnO films are highly c-axis oriented and the line width of(002)diffraction peak is significantly smaller than that measured from the ZnO films deposited by magnetron sput tering.The combined photoluminescence and photoluminescence excitation(PLE)spectroscopic measurements demonstrate the sharp band-absorption edge and exciton absorption in the ZnO films.PLE has also revealed that the absorption characteristic near the band edge is remarkably improved with the increase of oxygen content in the ZnO films,although x-ray diffraction analysis shows that the crystalline structure of ZnO films grown under different oxygen pressures remains unchanged. 展开更多
关键词 ABSORPTION FILMS unchanged
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Raman Scattering Study of PbSe Grown on(111)BaF_(2) Substrate
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作者 YANG Ai-ling WU Hui-Zhen +5 位作者 LI Zhi-Feng qiu dong-jiang CHANG Yong LI Jian-Feng P.J.McCann X.M.Fang 《Chinese Physics Letters》 SCIE CAS CSCD 2000年第8期606-608,共3页
PbSe films were grown on(111)-oriented BaF_(2)substrates by using molecular beam epitaxy.High resolution x-ray diffraction characterization showed good crystalline quality of PbSe films.Both longitudinal optical phono... PbSe films were grown on(111)-oriented BaF_(2)substrates by using molecular beam epitaxy.High resolution x-ray diffraction characterization showed good crystalline quality of PbSe films.Both longitudinal optical phonon at 135cm^(-1)and transverse optical phonon at 47.6cm-1 were observed by Raman scattering measurements.The Raman tensor calculation demonstrates that both transverse-optical and longitudinal-optical(LO)phonons in PbSe crystal are Raman active on(111)-oriented surface,Furthermore,2LO phonon at about 270cm^(-1)and polaron at about 800cm^(-1)in PbSe,were also observed.The observed Raman frequencies are in good agreement with theoretical calculations using point ion model. 展开更多
关键词 SCATTERING TRANSVERSE PHONON
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