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Electroluminescence from Single-Walled Carbon Nanotubes with Quantum Defects

Li, Min-Ken

Abstract (englisch):

Individual single-walled carbon nanotubes with covalent sidewall defects have emerged as a new class of photon sources whose photoluminescence spectra can be tailored by the carbon nanotube chirality and the attached functional group/molecule. Here we present electroluminescence spectroscopy data from single-tube devices based on (7, 5) carbon nanotubes, functionalized with dichlorobenzene molecules, and wired to graphene electrodes. We observe electrically generated, defect-induced emissions that are controllable by electrostatic gating and strongly red-shifted compared to emissions from pristine nanotubes. The defect-induced emissions are assigned to excitonic and trionic recombination processes by correlating electroluminescence excitation maps with electrical transport and photoluminescence data. At cryogenic conditions additional, gate-dependent emission lines appear which are assigned to phonon-assisted hot-exciton electroluminescence from quasi-levels. Similar results were obtained with functionalized (6, 5) nanotubes. We also compare functionalized (7, 5) electroluminescence data with photoluminescence of pristine and functionalized (7, 5) nanotubes redox-doped using gold(III) chloride solution. ... mehr


Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Vortrag
Publikationsdatum 30.05.2023
Sprache Englisch
Identifikator KITopen-ID: 1000158859
HGF-Programm 47.11.05 (POF IV, LK 01) Towards Quantum and Neuromorphic Computing Functionalities
Veranstaltung 243rd ECS Meeting (2023), Boston, MA, USA, 28.05.2023 – 02.06.2023
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