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

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Jannika Lauth
  • Michele Failla
  • Eugen Klein
  • Christian Klinke
  • Sachin Kinge
  • Laurens D.A. Siebbeles

Externe Organisationen

  • Delft University of Technology
  • Universität Hamburg
  • Swansea University
  • Universität Rostock
  • Toyota Motor Europe
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Details

OriginalspracheEnglisch
Seiten (von - bis)21569-21576
Seitenumfang8
FachzeitschriftNANOSCALE
Jahrgang11
Ausgabenummer44
PublikationsstatusVeröffentlicht - 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 Sachgebiete

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Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons. / Lauth, Jannika; Failla, Michele; Klein, Eugen et al.
in: NANOSCALE, Jahrgang 11, Nr. 44, 28.11.2019, S. 21569-21576.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Lauth J, Failla M, Klein E, Klinke C, Kinge S, Siebbeles LDA. Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons. NANOSCALE. 2019 Nov 28;11(44):21569-21576. doi: 10.48550/arXiv.1908.04711, 10.1039/c9nr07927k, 10.15488/10413
Lauth, Jannika ; Failla, Michele ; Klein, Eugen et al. / Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons. in: NANOSCALE. 2019 ; Jahrgang 11, Nr. 44. S. 21569-21576.
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title = "Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons",
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.",
author = "Jannika Lauth and Michele Failla and Eugen Klein and Christian Klinke and Sachin Kinge and Siebbeles, {Laurens D.A.}",
note = "Funding Information: aInstitute of Physical Chemistry and Electrochemistry, Leibniz Universit{\"a}t 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, Universit{\"a}t Hamburg, Grindelallee 117, D-20146, Germany eChemistry Department, Swansea University, SA2 8PP, UK fInstitute of Physics, Universit{\"a}t Rostock, Albert-Einstein-Stra{\ss}e 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{\textquoteright}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).",
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volume = "11",
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journal = "NANOSCALE",
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publisher = "Royal Society of Chemistry",
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Download

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.

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U2 - 10.48550/arXiv.1908.04711

DO - 10.48550/arXiv.1908.04711

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VL - 11

SP - 21569

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JO - NANOSCALE

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ER -

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