Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/150369
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dc.titlePHOTONIC AND OPTOELECTRONIC DEVICES BASED ON TWO-DIMENSIONAL TRANSITIONAL METAL DICHALCOGENIDE HETEROSTRUCTURES
dc.contributor.authorREN TIANHUA
dc.date.accessioned2018-12-31T18:01:57Z
dc.date.available2018-12-31T18:01:57Z
dc.date.issued2018-03-14
dc.identifier.citationREN TIANHUA (2018-03-14). PHOTONIC AND OPTOELECTRONIC DEVICES BASED ON TWO-DIMENSIONAL TRANSITIONAL METAL DICHALCOGENIDE HETEROSTRUCTURES. ScholarBank@NUS Repository.
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/150369
dc.description.abstractOptical devices based on two-dimensional (2D) materials have experienced significant growth over the past decade. 2D Transition Metal Dichalcogenide (TMD) materials have been considered as the enabling components for optical emitters and photodetectors on the silicon photonic platform. Micro-disk optical cavities have been made from layered hexagonal boron nitride (h-BN) and 2D TMD semiconductors. The exciton and trion emissions of monolayer TMD are localized in whispering gallery modes with quality factor of up to 1800. We demonstrate that the h-BN/TMD/h-BN cavity can serve as optical light source that is compatible with the silicon platform. Van der Waals heterostructures have also been investigated as photodetectors on the silicon platform. It is found that trilayer architecture of WSe<sub>2</sub>/BP/MoS<sub>2</sub>, as well as WSe<sub>2</sub>/WS<sub>2</sub>/MoS<sub>2</sub>, exhibit effective spatial segregation of electrons and holes with extended recombination lifetimes (up to 4350 ps for WSe<sub>2</sub>/WS<sub>2</sub>/MoS<sub>2</sub>). The WSe<sub>2</sub>/WS<sub>2</sub>/MoS<sub>2</sub> photodetector demonstrates high photoresponsivity of 56 mA/W.
dc.language.isoen
dc.subject2D, Transition Metal Dichalcogenide, Photonics, Optoelectronics, Heterostructure, Photonic Circuit
dc.typeThesis
dc.contributor.departmentCHEMISTRY
dc.contributor.supervisorLOH KIAN PING
dc.description.degreePh.D
dc.description.degreeconferredDOCTOR OF PHILOSOPHY
dc.identifier.orcid0000-0002-3647-3219
Appears in Collections:Ph.D Theses (Open)

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