Abstract
The transport properties of self-assembled guanosine supramolecules (SAGS)
confined within nanoscale metal electrodes on transparent GaN semiconductor
substrates have been studied. The modified guanosine molecules have been
used as self-assembled nanowires to realize nanoscale UV-Visible
photodetectors with self-assembly length ranging from 30 to 450 nm. The
ribbon-like guanosine supramolecules exhibit semiconductor properties and
have polarization along its axis due to the strong intrinsic dipole moment
of guanosine molecules. The charge transport through the SAGS wire with
nanoscale metal-semiconductor-metal structure on passivated Ga-terminated
GaN surface can be explained by Schottky type conductivity and
near-surface-states. The intrinsic polarization in SAGS nano-wires changes
the band-offset at the metal-semiconductor interface similar to
semiconductor photodiodes.
© 2009 IEEE
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