Structural, optical and electrical characterization of Mn super(2+) and Cd super(2+) doped/co-doped PbS nanocrystals

The strain and stress minimized nanoparticles of PbS, Pb sub(0.95)Mn sub(0.05)S, Pb sub(0.95)Cd sub(0.05)S and Pb sub(0.90)Mn sub(0.05)Cd sub(0.05)S were successfully synthesized using solvothermal microwave irradiation (SMI) method. The quality/performance of the materials was found to be in the se...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-04, Vol.627, p.69-77
Main Authors: Saravanan, R Sakthi Sudar, Meena, M, Pukazhselvan, D, Mahadevan, C K
Format: Article
Language:English
Subjects:
Alloys
Conductivity
Crystallites
Electrical properties
Frequency ranges
Microwaves
Nanocrystals
Nanoparticles
Resistivity
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Summary:The strain and stress minimized nanoparticles of PbS, Pb sub(0.95)Mn sub(0.05)S, Pb sub(0.95)Cd sub(0.05)S and Pb sub(0.90)Mn sub(0.05)Cd sub(0.05)S were successfully synthesized using solvothermal microwave irradiation (SMI) method. The quality/performance of the materials was found to be in the series Pb sub(0.90)Mn sub(0.05)Cd sub(0.05)S > Pb sub(0.95)Cd sub(0.05)S > Pb sub(0.95)Mn sub(0.05)S > PbS. The average crystallite size in the best material Pb sub(0.90)Mn sub(0.05)Cd sub(0.05)S was found to be ~18 nm where the particles are distributed within the range 20-60 nm. Optical studies reveals the existence of direct band gap in the range of 2.025-2.235 eV (+ or - 0.012 eV). This is one of the widest E sub(g) values reported for this system. Electrical measurements were performed on compacts of nanoparticles in the temperature range 313-433 K and frequency range 100 Hz-1 MHz. The conductivity profile exhibits two components; in which the activation energy ( Delta E) values obtained for the temperature range 373-433 K is almost twice as compared to the Delta E value obtained for 313-373 K. Nonetheless, the conductivity at the higher temperatures was always higher than at the low temperatures and interestingly, the nanoparticles exhibits higher conductivity than their bulk counterpart. The feasible mechanism of conduction is discussed.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2014.12.008