Details
| Original language | English |
|---|---|
| Pages (from-to) | 21569-21576 |
| Number of pages | 8 |
| Journal | NANOSCALE |
| Volume | 11 |
| Issue number | 44 |
| Publication status | Published - 28 Nov 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.
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
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In: NANOSCALE, Vol. 11, No. 44, 28.11.2019, p. 21569-21576.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons
AU - Lauth, Jannika
AU - Failla, Michele
AU - Klein, Eugen
AU - Klinke, Christian
AU - Kinge, Sachin
AU - Siebbeles, Laurens D.A.
N1 - Funding Information: aInstitute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstr. 3A, D-30167 Hannover, Germany. E-mail: jannika.lauth@pci.uni-hannover.de bDelft University of Technology, Van der Maasweg 9, NL-2629 HZ Delft, The Netherlands cCluster of Excellence PhoenixD (Photonics, Optics, and Engineering – Innovation Across Disciplines), Hannover, Germany dInstitute of Physical Chemistry, Universität Hamburg, Grindelallee 117, D-20146, Germany eChemistry Department, Swansea University, SA2 8PP, UK fInstitute of Physics, Universität Rostock, Albert-Einstein-Straße 23, D-18059 Rostock, Germany gToyota Motor Europe, Materials Research & Development, B-1930 Zaventem, Belgium Funding Information: We thank Dr Michiel Aerts and Dr Juleon M. Schins for contributing to an early stage of the data analysis and manuscript. This work is part of the research program TOP-grants with project number 715.016.002, which is financed by the Netherlands Organization for Scientific Research (NWO). C. K. gratefully acknowledges financial support of the European Research Council via the ERC Starting Grant “2D-SYNETRA” (Seventh Framework Program FP7, Project: 304980) and the German Research Foundation DFG for financial support in the frame the Heisenberg scholarship KL 1453/9-2. E. K. and C. K. thank the German Research Foundation DFG for financial support in the frame of the Cluster of Excellence “Center of ultrafast imaging CUI”. Funding Information: J. L. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). Funding Information: We thank Dr Michiel Aerts and Dr Juleon M. Schins for contributing to an early stage of the data analysis and manuscript. This work is part of the research program TOP-grants with project number 715.016.002, which is financed by the Netherlands Organization for Scientific Research (NWO). C. K. gratefully acknowledges financial support of the European Research Council via the ERC Starting Grant "2D-SYNETRA" (Seventh Framework Program FP7, Project: 304980) and the German Research Foundation DFG for financial support in the frame the Heisenberg scholarship KL 1453/9-2. E. K. and C. K. thank the German Research Foundation DFG for financial support in the frame of the Cluster of Excellence "Center of ultrafast imaging CUI". J. L. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453).
PY - 2019/11/28
Y1 - 2019/11/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85074965049&partnerID=8YFLogxK
U2 - 10.48550/arXiv.1908.04711
DO - 10.48550/arXiv.1908.04711
M3 - Article
C2 - 31688863
AN - SCOPUS:85074965049
VL - 11
SP - 21569
EP - 21576
JO - NANOSCALE
JF - NANOSCALE
SN - 2040-3364
IS - 44
ER -