Print Email Facebook Twitter Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons Title Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons Author Lauth, J.D. (TU Delft ChemE/Opto-electronic Materials; Leibniz Universität; Cluster of Excellence PhoenixD (Photonics) Failla, M. (TU Delft ChemE/Opto-electronic Materials) Klein, Eugen (Hamburg University of Technology) Klinke, Christian (Hamburg University of Technology; Swansea University; Universität Rostock) Kinge, S.S. (Toyota Motor Europe) Siebbeles, L.D.A. (TU Delft ChemE/Opto-electronic Materials) Date 2019 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. To reference this document use: http://resolver.tudelft.nl/uuid:68d763e3-f3f2-40fd-ac0c-36b9749d321a DOI https://doi.org/10.1039/c9nr07927k Embargo date 2020-04-28 ISSN 2040-3364 Source Nanoscale, 11 (44), 21569-21576 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2019 J.D. Lauth, M. Failla, Eugen Klein, Christian Klinke, S.S. Kinge, L.D.A. Siebbeles Files PDF c9nr07927ktaverne.pdf 1.58 MB Close viewer /islandora/object/uuid:68d763e3-f3f2-40fd-ac0c-36b9749d321a/datastream/OBJ/view