Piezoreflectance and Raman characterization of Mo1-xWxS2 layered mixed crystals

被引：10

作者：

Dumcenco, Dumitru O. ^{[1
]}

Su, Yu-Chen ^{[1
]}

Wang, Yi-Ping ^{[1
]}

Chen, Kuei-Yu ^{[1
]}

Huang, Ying-Sheng ^{[1
]}

Ho, Ching-Hwa ^{[1
]}

Tiong, Kwong-Kau ^{[2
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Elect Engn, Taipei 106, Taiwan

[2] Natl Taiwan Ocean Univ, Dept Elect Engn, Keelung 202, Taiwan

来源：

SOLID COMPOUNDS OF TRANSITION ELEMENTS | 2011年 / 170卷

关键词：

layered crystals; molybdenum disulphide; tungsten disulphide; piezoreflectance; Raman scattering; TRANSITION-METAL DICHALCOGENIDES; ELECTRONIC-STRUCTURE; SINGLE-CRYSTALS; MOS2; SCATTERING; DISULFIDE; WSE2; SPECTROSCOPY; DEPENDENCE; SPECTRA;

D O I：

10.4028/www.scientific.net/SSP.170.55

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A systematic optical characterization of a series of Mo1-xWxS2 (0 <= x <= 1) layered mixed crystals grown by chemical vapour transport method were carried out by using piezoreflectance (PzR) and Raman scattering measurements. From a detailed lineshape fit of the PzR spectra over an energy range from 1.6 to 5.0 eV, the energies of the band-edge excitonic and higher lying interband transitions were determined accurately. The transition energies and their splittings vary smoothly with the tungsten composition x indicating that the nature of the band structure is similar for the Mo1-xWxS2 series compounds. The peaks of the two dominant first-order Raman-active modes, A(1g) and E-2g(1), and several second-order bands are observed in the range of 250-450 cm(-1). The peaks corresponding to A(1g) mode show a one-mode type behavior, while the peaks of E-2g(1) mode demonstrate two-mode type behavior for the entire series of Mo1-xWxS2 crystals. These behaviors were discussed on the basis of the lattice vibrational properties of 2H-MoS2 and 2H-WS2 compounds.

引用

页码：55 / 59

页数：5

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