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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51637

Title: Optical properties of tungsten disulfide single crystals doped with gold
Authors: D.O. Dumcenco
H. P. Hsu
Y.S. Huang
C.H. Liang
K.K. Tiong
C. H. Du
Contributors: 國立臺灣海洋大學:電機工程學系
Keywords: Transition metal dichalcogenides
Surface photovoltage spectroscopy
Date: 2008
Issue Date: 2018-12-13T07:12:50Z
Abstract: Abstract: 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.
Relation: 111(2-3) pp.475-479
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51637
Appears in Collections:[電機工程學系] 期刊論文

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