Jump to main content
Jump to site search

Issue 44, 2019
Previous Article Next Article

Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons

Author affiliations

Abstract

Solution-processable two-dimensional (2D) semiconductors with chemically tunable thickness and associated tunable band gaps are highly promising materials for ultrathin optoelectronics. Here, the properties of free charge carriers and excitons in 2D PbS nanosheets of different thickness are investigated by means of optical pump-terahertz probe spectroscopy. By analyzing the frequency-dependent THz response, a large quantum yield of excitons is found. The scattering time of free charge carriers increases with nanosheet thickness, which is ascribed to reduced effects of surface defects and ligands in thicker nanosheets. The data discussed provide values for the DC mobility in the range 550–1000 cm2 V−1 s−1 for PbS nanosheets with thicknesses ranging from 4 to 16 nm. Results underpin the suitability of colloidal 2D PbS nanosheets for optoelectronic applications.

Graphical abstract: Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons

Back to tab navigation

Supplementary files

Publication details

The article was received on 15 Sep 2019, accepted on 27 Oct 2019 and first published on 28 Oct 2019


Article type: Paper
DOI: 10.1039/C9NR07927K
Nanoscale, 2019,11, 21569-21576

  •   Request permissions

    Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons

    J. Lauth, M. Failla, E. Klein, C. Klinke, S. Kinge and L. D. A. Siebbeles, Nanoscale, 2019, 11, 21569
    DOI: 10.1039/C9NR07927K

Search articles by author

Spotlight

Advertisements