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Open AccessArticle

Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms

Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
School of Computer, South China Normal University, Guangzhou 510631, China
Author to whom correspondence should be addressed.
Coatings 2019, 9(6), 376;
Received: 14 May 2019 / Revised: 31 May 2019 / Accepted: 4 June 2019 / Published: 10 June 2019
In this paper, pristine and Cr-doped lead sulfide (PbS) nanofilms were prepared by chemical and deposition methods. From X-ray diffraction (XRD) analysis, all nanofilm samples possessed good crystallinity with a preferential orientation of the (200) crystal plane. As the Cr doping concentration increased, the nanofilm grain size decreased from 71.5 to 18.9 nm. The SEM results revealed that the variation in Cr concentration led to different grain shapes, and the grain size became smaller with the increasing doping concentrations. Optical studies showed that the optical band gap of PbS films increased from 1.21 to 1.60 eV after Cr doping due to the quantum confinement effect; the 2% Cr-doped PbS nanofilm, with an Eg of 1.49 eV, matched the ideal band-gap value. The electrical characterization showed that, for a 2% Cr doping concentration, the Hall mobility and volume carrier concentration of the nanofilm reached the maximum values of 59.6 cm2∙V−1 s−1 and 20.7 × 1016 cm−3 respectively. The 2 at.% Cr-doped PbS nanofilms exhibited the best optical and electrical properties, suitable for solar cell applications. View Full-Text
Keywords: PbS; nanofilms; band gap; Cr PbS; nanofilms; band gap; Cr
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Huo, J.; Li, W.; Wang, T. Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms. Coatings 2019, 9, 376.

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