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Journal of Nanophotonics

Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy
Author(s): Syed Abuthahir Ziaudeen; Rohit R. Gaddam; Praveen Kumar Pallapothu; Manoj Krishna Sugumar; Jagannathan Rangarajan
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Paper Abstract

Nanostructures of lead sulfide (Eg ∼0.67 to 1.7 eV) corresponding to different quantum confinement regimes (weak, moderate, and strong with radii 14, 11, and 7 nm, respectively) have been synthesized through facile aqueous colloidal method and have been capped using poly vinyl alcohol. There is a marked difference in electron-lattice coupling properties as revealed through Fourier transform infrared data with strong quantum confined PbS quantum dots (QDs) exhibiting pronounced electron-lattice coupling characteristics. Opto-impedance characteristics of these samples suggest the enhanced mobility of charges, in particular under the supra gap excitation for strong quantum confined QDs.

Paper Details

Date Published: 17 December 2013
PDF: 13 pages
J. Nanophoton. 7(1) 073075 doi: 10.1117/1.JNP.7.073075
Published in: Journal of Nanophotonics Volume 7, Issue 1
Show Author Affiliations
Syed Abuthahir Ziaudeen, CSIR-Madras Complex (India)
Rohit R. Gaddam, Amity Institute of Nano Technology (India)
Praveen Kumar Pallapothu, CSIR-Madras Complex (India)
Manoj Krishna Sugumar, CSIR-Madras Complex (India)
Jagannathan Rangarajan, CSIR-Madras Complex (India)

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