Electron transport in iron porphyrin molecular junctions and layered vanadium disulfide ultrathin flakes
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Authors
Nawarat, Poomirat
Issue Date
2019-12
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Physics
Alternative Title
Abstract
To date, the experimental studies of the voltage-dependent-electron-transport (VDET) of iron porphyrin is limited. In this thesis, Fe(III) 5,15-di[4-(s-acetylthio)phenyl] 10,20-diphenyl porphine acetate (FeP) is used for VDET measurements. The MJs were formed with self-assembled FeP molecules on a gold (Au) film and a conductive atomic force microscope (AFM) tip. The surface characterization by AFM of the self-assembled FeP indicates the successful deposition of FeP on the Au film with a finite roughness. From the Raman spectra, vibrational modes of FeP are consistent with mode assignments for Fe(TPP)2O reported in literature. The electrical current versus bias voltage (I-V) measurements of FeP MJs show current fluctuations and both symmetric and asymmetric behaviors. The variation in the microgeometry of the MJs and the roughness of the self-assembled FeP likely contribute to the current fluctuations. To understand the VDET property of FeP, a quantitative analysis is performed using the averaged I-V curves with low current fluctuations.
Description
December 2019
School of Science
School of Science
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY