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PbS and PbS/CdS quantum dots: Synthesized by photochemical approach, structural, linear and nonlinear response properties, and optical limiting

Published online by Cambridge University Press:  04 February 2020

Mehdi Molaei ,
Masoud Karimipour ,
Samaneh Abbasi ,
Mohammad Khanzadeh  and
Masoud Dehghanipour
Mehdi Molaei*
Affiliation:
Department of the Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
Masoud Karimipour
Affiliation:
Department of the Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
Samaneh Abbasi
Affiliation:
Department of the Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
Mohammad Khanzadeh
Affiliation:
Department of the Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
Masoud Dehghanipour
Affiliation:
Department of the Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
*
a)Address all correspondence to this author. e-mail: mmolaei8@gmail.com
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Abstract

In this work, PbS and PbS/CdS core–shell quantum dots (QDs) were synthesized by a new photochemical approach. Prepared QDs were characterized by means of x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive x-ray analysis (EDAX), UV–Vis, and Z-scan analyses. Synthesized QDs were in a cubic phase with a spherical morphology, and the crystallite sizes are estimated using the strain–size method. A uniform shift of Bragg diffraction peaks and quenching (200) Bragg plane are interpreted as the growth of the CdS shell. Linear optical properties were investigated using Urbach analysis and Tauc formula. It was found that the density of states of QD conduction and valence bands are three dimensional. The estimated sizes of PbS QDs and PbS/CdS using exciton absorption peaks at room temperature are 1.8 and 2.7 nm, respectively, which are in good agreement with the strain–size plot analysis. The growth of the CdS shell resulted in a considerable decrease in the nonlinearity refractive index and a significant increase in the nonlinear absorption.

Keywords

PbSPbS/CdSlinearnonlinearoptical
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 4 , 28 February 2020 , pp. 401 - 409
Copyright
Copyright © Materials Research Society 2020

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