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Transport model for disordered organic nanocomposites

Published online by Cambridge University Press:  15 July 2014

Andrés Vercik
Andrés Vercik*
Affiliation:
Nanotechnology, Biosensors and Devices Laboratory, University of São Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga - SP, Brazil
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Abstract

Electric transport in disordered media is usually explained in terms of different transport regimes, such as SCLC (Space Charge Limited Current) or TCLC (Trap Charge Limited Current) regimes. These models lead to exponential dependencies of the current on voltage, e.g., quadratic for SCLC or higher order for TCLC, with transition regions between them where fitting is poor. Alternatively, a statistical distribution in space and energy of the disordered traps, e.g., Gaussian or exponential, allows explaining transport in disordered materials. In this work, we propose a modeling based on the density of states (DOS) function, fitted from normalized differential conductivity curves obtained from experimental current-voltage curves. In general a Gaussian function is used for low energies whereas one or more exponential functions are used for higher energies. The proposed model is used to reproduce experimental current-voltage curves of organic nanocomposites, with gold and silver nanoparticles within chitosan matrixes. A unique expression is obtained for a very accurate fitting the experimental current-voltage characteristics in the whole voltage range without transition regions.

Keywords

electrical propertiesnanostructurepolymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1660: Symposium TT – Transport Properties in Nanocomposites , 2014 , mrsf13-1660-tt01-01
Copyright
Copyright © Materials Research Society 2014 

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References

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