淡江大學機構典藏:Item 987654321/50356
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    题名: Optical properties of tungsten disulfide single crystals doped with gold
    作者: Dumcenco, D. O.;Hsu, H. P.;Huang, Y. S.;Liang, C. H.;Tiong, K. K.;Du, C. H.
    贡献者: 淡江大學物理學系
    关键词: Transition metal dichalcogenides;Piezoreflectance;Surface photovoltage spectroscopy;Photoconductivity
    日期: 2008-10
    上传时间: 2010-08-09 15:49:00 (UTC+8)
    出版者: Amsterdam: Elsevier S.A.
    摘要: Single crystals of WS2 doped with gold have been grown by the chemical vapour transport method using iodine as a transporting agent. X-ray diffraction (XRD) pattern analysis revealed presence of mixed three-layer rhombohedral (3R) and two-layer hexagonal (2H) polytypes for the doped crystals while the undoped one shows only 2H form. Hall measurements indicate that the samples are p-type in nature. The doping effects of the materials are characterized by surface photovoltage (SPV), photoconductivity (PC) and piezoreflectance (PzR) measurements. Room temperature SPV and PC spectra reveal a feature located at 60 meV below the A exciton and has been tentatively assigned to be an impurity level caused by Au dopant. Excitonic transition energies of the A, B, d and C excitons detected in PzR spectra show red shift due to the presence of a small amount of Au and the broadening parameters of the excitonic transition features increase due to impurity scattering. The values of the parameters that describe the electron (exciton)–phonon interaction of excitonic transitions of A–B are about two times larger than that of d–C excitonic pairs. The possible assignments of the different origins of A–B and d–C excitonic pairs have been discussed.
    關聯: Materials Chemistry and Physics 111(2-3), pp.475-479
    DOI: 10.1016/j.matchemphys.2008.04.052
    显示于类别:[物理學系暨研究所] 期刊論文

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