Jump to main content
Jump to site search


Colloidal PbS nanoplatelets synthesized via cation exchange for electronic applications

Author affiliations

Abstract

In this work, we present a new synthetic approach to colloidal PbS nanoplatelets (NPLs) utilizing a cation exchange (CE) strategy starting from CuS NPLs synthesized via the hot-injection method. Whereas the thickness of the resulting CuS NPLs was fixed at approx. 5 nm, the lateral size could be tuned by varying the reaction conditions, such as time from 6 to 16 h, the reaction temperature (120 °C, 140 °C), and the amount of copper precursor. In a second step, Cu+ cations were replaced with Pb2+ ions within the crystal lattice via CE. While the shape and the size of parental CuS platelets were preserved, the crystal structure was rearranged from hexagonal covellite to PbS galena, accompanied by the fragmentation of the monocrystalline phase into polycrystalline one. Afterwards a halide mediated ligand exchange (LE) was carried out in order to remove insulating oleic acid residues from the PbS NPL surface and to form stable dispersions in polar organic solvents enabling thin-film fabrication. Both CE and LE processes were monitored by several characterization techniques. Furthermore, we measured the electrical conductivity of the resulting PbS NPL-based films before and after LE and compared the processing in ambient to inert atmosphere. Finally, we fabricated field-effect transistors with an on/off ratio of up to 60 and linear charge carrier mobility for holes of 0.02 cm2 V−1 s−1.

Graphical abstract: Colloidal PbS nanoplatelets synthesized via cation exchange for electronic applications

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Mar 2019, accepted on 31 May 2019 and first published on 05 Jun 2019


Article type: Paper
DOI: 10.1039/C9NR02437A
Nanoscale, 2019, Advance Article
  • Open access: Creative Commons BY license
  •   Request permissions

    Colloidal PbS nanoplatelets synthesized via cation exchange for electronic applications

    L. Sonntag, V. Shamraienko, X. Fan, M. Samadi Khoshkhoo, D. Kneppe, A. Koitzsch, T. Gemming, K. Hiekel, K. Leo, V. Lesnyak and A. Eychmüller, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR02437A

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements