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Journal Article

Electronic transport in monolayers of phthalocyanine polymers


Wu,  J.
MPI for Polymer Research, Max Planck Society;

Neher,  Dieter
MPI for Polymer Research, Max Planck Society;

Wegner,  Gerhard
MPI for Polymer Research, Max Planck Society;

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Tans, S. J., Miedema, R. G., Geerligs, L. J., Dekker, C., Wu, J., Neher, D., et al. (2003). Electronic transport in monolayers of phthalocyanine polymers. Nanotechnology, 14(9), 1043-1050.

Cite as:
We report on a study of the electrical-transport properties of monolayers of phthalocyaninepolysiloxane (PcPS) polymers, and evaluate their potential for use as molecular wires. Monolayers have been deposited with the Langmuir–Blodgett technique on top of Si/SiO2 substrates with interdigitated electrodes. Current–voltage curves have been measured as a function of temperature for samples with varying electrode distance and number of monolayers. In the undoped state, the conduction is well described by the space-charge-limited-current model. From the data we obtain material characteristics such as the density of trap states within the gap and an estimate of the charge-carrier mobility. It appears that the conductivity is too low to yield a measurable current through a single PcPS polymer. Chemical doping and a field effect have been investigated. Oxygen is effective in doping the PcPS layers, resulting in a two orders of magnitude increase of the conductivity. Iodine is not effective as a dopant. By application of a voltage on a back-gate, we observe a field-effect-induced increase of the conductivity by three orders of magnitude. The effect however decays rapidly in time.