Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/69466
Title: Synthesis and optical properties of atomically thin transition metal dichalcogenides
Authors: Lu, Xin
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2017
Source: Lu, X. (2017). Synthesis and optical properties of atomically thin transition metal dichalcogenides. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: Interest in two dimensional (2D) layered transition metal dichalcogenides (TMDs) has been rejuvenated within the past decade, particularly in the mono- and few-layers. The fascinating properties, such as valley polarization and strong photoluminescence (PL), have attracted more and more researches into 2D materials. In this thesis, I will introduce my work on the synthesis and optical properties of mono- and few-layer TMD materials, mainly taking MoSe2 as an example. Both top-down (mechanical exfoliation and thermal annealing thinning) and bottom-up methods will be presented. As the growth inside a chemical vapor deposition (CVD) chamber has been proven to be successful and efficient for the preparation of atomically thin TMD samples, CVD-synthesis of MoSe2 and WSe2 thin films and nanoflakes will be demonstrated. Optical properties on the as-grown samples will be shown, with PL, Raman, and optical absorption spectra displayed. The investigation on optical properties will focus on phonon properties. Firstly, relationship on stacking sequences and the evolutional trend of interlayer shear modes in MoSe2 with increasing thickness will be demonstrated. Subsequently, electrical control of phonon properties in MoS2 will be shown. Dependence on excitation energy of Vtg-related Raman shift will be discussed in detail as well.
URI: http://hdl.handle.net/10356/69466
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Theses

Files in This Item:
File Description SizeFormat 
Thesis_Final_Lu Xin-submission.pdf13.38 MBAdobe PDFThumbnail
View/Open

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.