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Electron and Spin Transport in Graphene and Metallic Channels with Photosystem I

Bosma, T. (2016) Electron and Spin Transport in Graphene and Metallic Channels with Photosystem I. Master's Thesis / Essay, Applied Physics.

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In this research monolayers of photosystem I (PSI) and their charge transfer characteristics are investigated. We have self-assembled them onto chemical vapor deposited graphene sheets via peptide linkers, which should also orient the PSI to have its dipole downwards. Tapping mode atomic force microscopy (AFM) as well as conductive probe AFM are employed to confirm the coverage and orientation of the PSI complexes. These monolayers are also integrated in a backgated graphene field-effect transistor in order to study the electrical properties of graphene before and after self-assembly. Illumination experiments have been performed to observe a variation in doping level of the graphene induced by a changing dipole in PSI. In addition, a paper introducing spin selectivity in charge transfer by photosystem I is analyzed regarding reproducibility. Calculations based on a resistor model are performed. These imply that the measured signal requires larger currents than known charge transfer rates for PSI predict. Finally, we introduce a conceptual device based on a nonlocal spin valve geometry to measure the signal from spin selectivity in PSI.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Applied Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:30
Last Modified: 15 Feb 2018 08:30

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