Particle size dependence of resonant-tunneling effect induced by CdS nanoparticles in a poly(N-vinylcarbazole) polymer matrix

Giuseppe Nenna, Silvia Masala, Valentina Bizzarro, Marilena Re, Emanuela Pesce, Carla Minarini, Tiziana Di Luccio

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Abstract

CdS nanoparticles of different sizes were synthesised in poly(N-vinylcarbazole) and studied in device structures glass/indium tin oxide (ITO)/PVK:CdS/Al. Electrical bistability and negative differential resistance (NDR) effects were observed in the current-voltage characteristics. In addition, the devices showed a considerable enhancement of the current magnitude. A dependence of the current conduction on the nanoparticle size and size distribution in the polymer was studied through electrical impedance measurements. The study revealed the importance of the charge effects of the nanoparticles resulting in a bistable behavior. A resonant tunneling current model was proposed to explain the NDR and its relation with the nanoparticle size and size distribution. © 2012 American Institute of Physics.
Original languageEnglish
Article number044508
Pages (from-to)-
JournalJournal of Applied Physics
Volume112
Issue number4
DOIs
Publication statusPublished - 15 Aug 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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