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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 49185.0, MPI für Polymerforschung / MPI Polymerforschung
Electronic transport in monolayers of phthalocyanine polymers
Authors:Tans, S. J.; Miedema, R. G.; Geerligs, L. J.; Dekker, C.; Wu, J.; Neher, Dieter; Wegner, Gerhard
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Nanotechnology
Issue / Number:9
Start Page:1043
End Page:1050
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Department of Applied Physics and DIMES, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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