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Morphological and electrical characterization of Cu-doped PbS thin films with AFM
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Stockholm, SE-100 44, Sweden.
Physics Condensed Matter Laboratory, Faculty of Science of Tunis, University of Tunis El-Manar.
Physics Condensed Matter Laboratory, Faculty of Science of Tunis, University of Tunis El-Manar.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2017 (English)In: Advanced Materials Letters, ISSN 0976-3961, E-ISSN 0976-397X, Vol. 8, no 11, 1029-1037 p.Article in journal (Refereed) Published
Abstract [en]

Lead sulphide (PbS) is a direct band gap IV–VI intrinsic p-type semiconductor with good potential for application in solar cells, sensors, etc. Doping the films with Cu2+ ions may improve the electrical properties. Here, Cu-doped PbS films were deposited on conducting glass substrates. The morphology, topography and thickness of the doped PbS films were examined using atomic force microscopy (AFM) and high-resolution SEM. AFM analysis showed decreasing surface roughness and grain size with the increase of Cu2+ concentration from 0.5 to 2.0 at%. Local surface electrical measurements using conducting AFM and Kelvin probe force microscopy showed the possibility to probe semi-quantitatively the changes in surface potential, work function, and Fermi level upon doping of the films. The estimated apparent work function for the un-doped PbS grains in the film was slightly above 4.5 eV, while it decreased to a minimum value of 4.43-4.45 eV at 1–1.5 at% Cu-doping. Conducting AFM measurements showed that local resistance of the doped samples is lower than on pure PbS films. These results indicate Cu doping as an effective strategy to tune the electrical properties of PbS thin films toward the development of suitable optically active materials for application in photovoltaics.

Place, publisher, year, edition, pages
VBRI Press , 2017. Vol. 8, no 11, 1029-1037 p.
Keyword [en]
Lead sulphide, KPFM, copper ions, solar cell, thin film
National Category
Nano Technology Other Physics Topics
Research subject
Experimental physics
Identifiers
URN: urn:nbn:se:ltu:diva-65415DOI: 10.5185/amlett.2017.1545OAI: oai:DiVA.org:ltu-65415DiVA: diva2:1137008
Available from: 2017-08-29 Created: 2017-08-29 Last updated: 2017-09-25Bibliographically approved

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