Riassunto analitico
This thesis experimentally investigates charge transport in chiral systems, both at the single- molecule level (in the classic configuration of the molecular junction: metal|molecule|metal interface), where the dominant transport mechanism is tunneling, and within more extensive and complex systems (conjugated polymers, hybrid interfaces), where the transition to incoherent transport (hopping) occurs. Transport measurements (I-V curves) are recorded in both the solid state (through mc-AFM measurements). In particular, numerous transport experiments are carried out in the presence of a ferromagnetic electrode (typically Nickel) in an external magnetic field to perform spin injection into the examined chiral system. This approach allows for the assessment of the spin polarization of charge carriers downstream of the measured interface as a function of the magnetic field orientation, evaluating the so-called Chiral Induced Spin-Selectivity Effect (CISS). In this thesis, the results achieved in terms of spin-filtering using chiral molecules (anchored to metallic substrates exploiting the S-metal interaction) are presented with IV curves and high resolution imaging.
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Abstract
This thesis experimentally investigates charge transport in chiral systems, both at the single- molecule level (in the classic configuration of the molecular junction: metal|molecule|metal interface), where the dominant transport mechanism is tunneling, and within more extensive and complex systems (conjugated polymers, hybrid interfaces), where the transition to incoherent transport (hopping) occurs. Transport measurements (I-V curves) are recorded in both the solid state (through mc-AFM measurements). In particular, numerous transport experiments are carried out in the presence of a ferromagnetic electrode (typically Nickel) in an external magnetic field to perform spin injection into the examined chiral system. This approach allows for the assessment of the spin polarization of charge carriers downstream of the measured interface as a function of the magnetic field orientation, evaluating the so-called Chiral Induced Spin-Selectivity Effect (CISS). In this thesis, the results achieved in terms of spin-filtering using chiral molecules (anchored to metallic substrates exploiting the S-metal interaction) are presented with IV curves and high resolution imaging.
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