Document 
Free access article
Eur. Phys. J. Appl. Phys. 42, 113-119 (2008)
DOI: 10.1051/epjap:2008043
Frequency dependent electrical characteristics of PbS quantum dots
S. Chowdhury1, A.M.P. Hussain1, G.A. Ahmed2 and A. Choudhury2, 31 Dept. of Physics, Gauhati University, Guwahati, Assam-781014, India
2 Dept. of Physics, Tezpur University, Napaam, Tezpur, Assam-784028, India
3 Gauhati University, Guwahati, Assam-781014, India
shyamoli_ma@yahoo.co.in
(Received: 23 November 2006 / Received in final form: 28 March 2007 / Accepted: 29 January 2008 / Published online: 9 April 2008)
Abstract
PbS quantum dots (bare and silica coated) have been synthesized in PVA matrix with average size 10 nm and 9 nm. The capacitance-voltage (C-V) and current -voltage (I-V) response of both bare and coated quantum dots have been recorded in different frequency range (Hz-MHz). Both the samples show frequency dependent response except in case of C-V characteristics at MHz range. The I-V responses at low frequency range exhibit step like structures which could be attributed to 'Coulomb blockade'.
73.63.Kv - Quantum dots.
82.35.Np - Nanoparticles in polymers.
61.05.cp - X-ray diffraction.
© EDP Sciences 2008