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

TitleParticle size dependence of resonant-tunneling effect induced by CdS nanoparticles in a poly(N-vinylcarbazole) polymer matrix
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2012
AuthorsNenna, G., Masala S., Bizzarro V., Re Marilena, Pesce Emanuela, Minarini Carla, and Di Luccio Tiziana
JournalJournal of Applied Physics
Volume112
ISSN00218979
KeywordsBistables, Cadmium compounds, Cadmium sulfide, CdS nanoparticles, Charge effect, Current conduction, Current magnitudes, Current voltage characteristics, Device structures, Different sizes, Electric impedance measurement, Electrical Bistability, Electrical impedance measurement, N-vinylcarbazole, Nanoparticle sizes, Nanoparticles, Negative differential resistances, Particle size dependence, Resonant tunneling, Size distribution, Tin, Tin oxides, Tunneling current models
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.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84865850635&doi=10.1063%2f1.4746783&partnerID=40&md5=eae7e69495d56f03d3d42ebf05319d06
DOI10.1063/1.4746783