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Rother M, Schießl SP, Zakharko Y, et al. Understanding Charge Transport in Mixed Networks of Semiconducting Carbon Nanotubes. ACS Appl Mater Interfaces. 2016;8(8):5571-9doi: 10.1021/acsami.6b00074.
Rother, M., Schießl, S. P., Zakharko, Y., Gannott, F., & Zaumseil, J. (2016). Understanding Charge Transport in Mixed Networks of Semiconducting Carbon Nanotubes. ACS applied materials & interfaces, 8(8), 5571-9. https://doi.org/10.1021/acsami.6b00074
Rother, Marcel, et al. "Understanding Charge Transport in Mixed Networks of Semiconducting Carbon Nanotubes." ACS applied materials & interfaces vol. 8,8 (2016): 5571-9. doi: https://doi.org/10.1021/acsami.6b00074
Rother M, Schießl SP, Zakharko Y, Gannott F, Zaumseil J. Understanding Charge Transport in Mixed Networks of Semiconducting Carbon Nanotubes. ACS Appl Mater Interfaces. 2016 Mar 02;8(8):5571-9. doi: 10.1021/acsami.6b00074. Epub 2016 Feb 19. PMID: 26867006; PMCID: PMC4778158.
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ACS Appl Mater Interfaces. 2016 Mar 02;8(8):5571-9. doi: 10.1021/acsami.6b00074. Epub 2016 Feb 19.

Understanding Charge Transport in Mixed Networks of Semiconducting Carbon Nanotubes.

ACS applied materials & interfaces

Marcel Rother, Stefan P Schießl, Yuriy Zakharko, Florentina Gannott, Jana Zaumseil

Affiliations

  1. Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg , D-91058 Erlangen, Germany.
  2. Institute for Physical Chemistry, Universität Heidelberg , D-69120 Heidelberg, Germany.

PMID: 26867006 PMCID: PMC4778158 DOI: 10.1021/acsami.6b00074

Abstract

The ability to select and enrich semiconducting single-walled carbon nanotubes (SWNT) with high purity has led to a fast rise of solution-processed nanotube network field-effect transistors (FETs) with high carrier mobilities and on/off current ratios. However, it remains an open question whether it is best to use a network of only one nanotube species (monochiral) or whether a mix of purely semiconducting nanotubes but with different bandgaps is sufficient for high performance FETs. For a range of different polymer-sorted semiconducting SWNT networks, we demonstrate that a very small amount of narrow bandgap nanotubes within a dense network of large bandgap nanotubes can dominate the transport and thus severely limit on-currents and effective carrier mobility. Using gate-voltage-dependent electroluminescence, we spatially and spectrally reveal preferential charge transport that does not depend on nominal network density but on the energy level distribution within the network and carrier density. On the basis of these results, we outline rational guidelines for the use of mixed SWNT networks to obtain high performance FETs while reducing the cost for purification.

Keywords: electroluminescence; network; photoluminescence; single-walled carbon nanotubes; transport

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