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Identifier 000456890
Title Excitons in TMD lateral heterostructures
Alternative Title Εξιτόνια σε TMD πλευρικές ετεροδομές
Author Μουρζίδης, Κωνσταντίνος
Thesis advisor Κιοσέογλου, Γεώργιος
Reviewer Κοπιδάκης, Γεώργιος
Στρατάκης, Εμμανουήλ
Abstract The never-ending attraction in the development of new layered two-dimensional (2D) materials is the legacy of graphene's success. Transition-metal dichalcogenides (TMDs) with the MX2 formula (where M represents the transition metal and X represents the chalcogen) have been identified as a leading candidate among a range of 2D materials in the post-graphene era. 2D materials have enabled the revolutionary development and construction of many types of heterostructures. Although there has been extensive discussion on the tunable mechanisms of vertical heterostructures utilizing various TMD materials, comparatively less effort has been spent to the tunable mechanisms of TMD lateral heterostructures (LHs), mainly due to the complexity of the growth process. Chemical vapor deposition (CVD) allows lateral edge epitaxy of transition metal dichalcogenide heterostructures (LHs), stitching structures in the monolayer plane, with potential applications in optoelectronics, including tunnelling transistors, light-emitting diodes, photodetectors, and photovoltaic cells. Because of the type-II band alignment and the atomically sharp heterojunction present in these materials, the carriers can spatially separate at the junction, giving rise to exciton dynamics investigations and future device fabrication. However, in as-grown CVD LHs, the intrinsic optical properties are masked due to the large inhomogeneous broadening of the optical transitions. To gain a deeper understanding of the excitonic properties at the interface of these materials, optical characterization of MoS2/WS2 LHs is performed at cryogenic temperatures (T = 78 K). In addition, LHs are encapsulated in hBN, providing atomic flatness and suppressing any disorder originating from the dielectric environment.
Language English
Subject 2D materials
TMDS
Issue date 2023-07-19
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/2/0/f/metadata-dlib-1688634252-113231-8632.tkl Bookmark and Share
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