Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-18T14:12:03.213Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Mensfoort, L. M. v., Billen, J., Carvelli, M., Vulto, S.I.E., R.A.J. Janssen, and Coehoorn, R., “Predictive modeling of the current density and radioactive recombination in blue polymer-based light-emitting diodes”, Journal of Applied. Physics. 109 (2011) 064502.10.1063/1.3553412CrossRefGoogle Scholar
Bettinger, C. J. and Bao, Z., “Biomaterials-Based Organic Electronic Devices”, Polymer International 59(5) (2010) 563–567.Google ScholarPubMed
Brutting, W., Berleb, S. and Mucol, A. G., “Device physics of organic light-emitting diodes based on molecular materials”, Organic Electronics 2 (2001) 1–36.10.1016/S1566-1199(01)00009-XCrossRefGoogle Scholar
Montero, J.M. and Bisquert, J., “Interpretation of trap-limited in space-charge limited current in organic layers with exponential density of traps”, Journal of Applied Physics 110 (2011) 043705.10.1063/1.3622615CrossRefGoogle Scholar
Campbell, A. J., Bradley, D. D. C. and Lidzey, D. G., “Space-Charge limited conduction with traps in poly (phenylene vinylene) light emitting diodes ”, Journal of Applied Physics 18 (1997) 6326–6341.10.1063/1.366523CrossRefGoogle Scholar
Akkilic, K., Uzun, I. and Kilicoglu, T., “The calculation of electronic properties of an Ag/chitosan/n-Si Schottky barrier diode”, Synth. Metals 157(6-7) (2007 297–302.10.1016/j.synthmet.2007.03.009CrossRefGoogle Scholar
Bozanic, D. K., Trandafilovic, L. V., Luyt, A. S. and Djokovic, V., “Green’ synthesis and optical properties of silver-chitosan complexes and nanocomposites”, Reactive and Functional Polymers 70 (2010) 869–873.10.1016/j.reactfunctpolym.2010.08.001CrossRefGoogle Scholar
Marin, L., Popescu, M.-C., Zabulica, A., Uji, H. and Fron, E., “Chitosan as matrix for bio-polymer dispersed liquid crystal Chitosan as matrix for bio-polymer dispersed liquid crystal Chitosan as matrix for bio-polymer dispersed liquid crystal systems”, Carbohydrate Polymers 95 (2013) 16–24.10.1016/j.carbpol.2013.02.028CrossRefGoogle ScholarPubMed
Wei, D. and Qian, W., “Facile synthesis of Ag and Au nanoparticles utilizing chitosan as a mediator agent”, Colloids and Sur- faces B: Biointerfaces 62 (2008) 136–142.10.1016/j.colsurfb.2007.09.030CrossRefGoogle ScholarPubMed
Yang, Y., Cui, J., Zheng, M., Hu, C., Tan, S., Xiao, Y., Yanga, Q. and Liu, Y., “One-step synthesis of amino-functionalized fluorescent carbon nanoparticles by hydrothermal carbonization of chitosan”, Chemical Communications I, 48 (2012) 380–382.10.1039/C1CC15678KCrossRefGoogle ScholarPubMed