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Thermoelectric Effects in Nanoscale Devices

Braun, Oliver. Thermoelectric Effects in Nanoscale Devices. 2021, Doctoral Thesis, University of Basel, Faculty of Science.

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Abstract

Bottom-up synthesized atomically precise graphene nanoribbons (GNRs) are Designer Quantum Materials, materials in which the properties can be designed and adjusted on-demand. GNRs offer a variety of properties: tunable bandgap, in-situ pn-junction formation, quantum dot behavior, and even exhibit topologically non-trivial phases. This shows that graphene nanoribbons are a versatile platform for novel electronic devices. However, many challenges remain in the device integration of these materials, especially regarding contacting and gating strategies. These two challenges directly enter the thermoelectric figure of merit zT via the electrical conductivity. This thesis covers various aspects of the GNR device integration for thermoelectric characterization. This involves the development of contacting and gating strategies for assessing the electrical conductivity of GNRs. Further, the Seebeck coefficient of GNR based devices is determined using an advanced measurement platform and scheme. Finally, a novel Raman-based method is established to map thermal conductivity. Although the working principle of this method is demonstrated on defect-engineered graphene membranes, it is extendable to films of GNRs.
Advisors:Calame, Michel and Zardo, Ilaria and Gehring, Pascal
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Material Physics (Zardo)
UniBasel Contributors:Calame, Michel and Zardo, Ilaria
Item Type:Thesis
Thesis Subtype:Doctoral Thesis
Thesis no:14665
Thesis status:Complete
Number of Pages:vi, 188
Language:English
Identification Number:
  • urn: urn:nbn:ch:bel-bau-diss146657
edoc DOI:
Last Modified:15 Apr 2022 04:30
Deposited On:14 Apr 2022 06:33

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