Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy

Syed Abuthahir Ziaudeen; Rohit R. Gaddam; Praveen Kumar Pallapothu; Manoj Krishna Sugumar; Jagannathan Rangarajan

doi:10.1117/1.JNP.7.073075

17 December 2013 Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy

Syed Abuthahir Ziaudeen, Rohit R. Gaddam, Praveen Kumar Pallapothu, Manoj Krishna Sugumar, Jagannathan Rangarajan

Author Affiliations +

Journal of Nanophotonics, Vol. 7, Issue 1, 073075 (December 2013). https://doi.org/10.1117/1.JNP.7.073075

Abstract

Nanostructures of lead sulfide (E_g ∼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.

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Syed Abuthahir Ziaudeen, Rohit R. Gaddam, Praveen Kumar Pallapothu, Manoj Krishna Sugumar, and Jagannathan Rangarajan "Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy," Journal of Nanophotonics 7(1), 073075 (17 December 2013). https://doi.org/10.1117/1.JNP.7.073075

Published: 17 December 2013

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