Rapid and Nondestructive Identification of Polytypism and Stacking Sequences in Few-Layer Molybdenum Diselenide by Raman Spectroscopy

Xin Lu; M Iqbal Bakti Utama; Junhao Lin; Xin Luo; Yanyuan Zhao; Jun Zhang; Sokrates T Pantelides; Wu Zhou; Su Ying Quek; Qihua Xiong

doi:10.1002/adma.201501086

Rapid and Nondestructive Identification of Polytypism and Stacking Sequences in Few-Layer Molybdenum Diselenide by Raman Spectroscopy

Adv Mater. 2015 Aug;27(30):4502-4508. doi: 10.1002/adma.201501086. Epub 2015 Jul 2.

Authors

Xin Lu¹, M Iqbal Bakti Utama¹, Junhao Lin^{2

3}, Xin Luo^{4

5}, Yanyuan Zhao¹, Jun Zhang¹, Sokrates T Pantelides^{2

3}, Wu Zhou³, Su Ying Quek^{4

5}, Qihua Xiong^{1

6}

Affiliations

¹ Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
² Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, 37235, USA.
³ Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
⁴ Department of Physics, Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore.
⁵ Institute of High Performance Computing, Singapore, 138632, Singapore.
⁶ NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

PMID: 26134241
DOI: 10.1002/adma.201501086

Abstract

Various combinations of interlayer shear modes emerge in few-layer molybdenum diselenide grown by chemical vapor deposition depending on the stacking configuration of the sample. Raman measurements may also reveal polytypism and stacking faults, as supported by first principles calculations and high-resolution transmission electron microscopy. Thus, Raman spectroscopy is an important tool in probing stacking-dependent properties in few-layer 2D materials.

Keywords: few layer MoSe2; interlayer shear mode; molybdenum diselenide; polytypism; stacking.