教師資料查詢 | 類別: 期刊論文 | 教師: 杜昭宏 Chao-hung Du (瀏覽個人網頁)

標題:Optical properties of tungsten disulfide single crystals doped with gold
學年97
學期1
出版(發表)日期2008/10/01
作品名稱Optical properties of tungsten disulfide single crystals doped with gold
作品名稱(其他語言)
著者Dumcenco, D. O.; Hsu, H. P.; Huang, Y. S.; Liang, C. H.; Tiong, K. K.; Du, C. H.
單位淡江大學物理學系
出版者Amsterdam: Elsevier S.A.
著錄名稱、卷期、頁數Materials Chemistry and Physics 111(2-3), pp.475-479
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.
關鍵字Transition metal dichalcogenides; Piezoreflectance; Surface photovoltage spectroscopy; Photoconductivity
語言英文
ISSN0254-0584
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