Aluminium and gold functionalized graphene quantum dots as electron acceptors for inverted Schottky junction type rainbow solar cells

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dc.contributor.advisorIwuoha, Emmanuel
dc.contributor.authorMathumba, Penny
dc.date.accessioned2020-04-16T12:52:23Z
dc.date.accessioned2024-05-13T12:40:45Z
dc.date.available2024-05-13T12:40:45Z
dc.date.issued2020
dc.descriptionPhilosophiae Doctor - PhDen_US
dc.description.abstractThe main aim of this study was to prepare band gap-engineered graphene quantum dot (GQD) structures which match the different energies of the visible region in the solar spectrum. These band gap-engineered graphene quantum dot structures were used as donor materials in rainbow Schottky junction solar cells, targeting all the energies in the visible region of the solar spectrum for improved solar-to-electricity power conversion efficiency. Structural characterisation of the prepared nanomaterials under solid-state nuclear magnetic resonance spectroscopy (SS-NMR) showed appearance of bands at 40 ppm due to the presence of sp3 hybridised carbon atoms from the peripheral region of the GQD structures. Other bands were observed at 130 ppm due to the presence of polycyclic aromatic carbon atoms from the benzene rings of the GQD backbone, and around 180 ppm due to the presence of carboxylic acid carbons from oxidation due to moisture. Fourier-transform infrared resonance (FTIR) spectroscopy further confirmed the presence of aromatic carbon atoms and oxidised carbons due to the presence of C=O, C=C and -OH functional groups, concurrent with SS-NMR results.en_US
dc.description.embargo2023-12-01
dc.identifier.urihttps://hdl.handle.net/10566/14733
dc.language.isoenen_US
dc.publisherUniversity of Western Capeen_US
dc.rights.holderUniversity of Western Capeen_US
dc.subjectBand-gap engineeringen_US
dc.subjectGraphene quantum dotsen_US
dc.subjectSchottky junction solar cellsen_US
dc.subjectSolar energyen_US
dc.subjectSolar spectrumen_US
dc.titleAluminium and gold functionalized graphene quantum dots as electron acceptors for inverted Schottky junction type rainbow solar cellsen_US

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Philosophiae Doctor - PhD (Chemistry)