Charge and thermoelectric transport in polymer-sorted semiconducting single-walled carbon nanotube networks

• Verfasst von: Statz, Martin [VerfasserIn]
• Verfasst von: Schneider, Severin [VerfasserIn]
• Verfasst von: Berger, Felix J. [VerfasserIn]
• Verfasst von: Lai, Lianglun [VerfasserIn]
• Verfasst von: Wood, William A. [VerfasserIn]
• Verfasst von: Abdi-Jalebi, Mojtaba [VerfasserIn]
• Verfasst von: Leingang, Simone [VerfasserIn]
• Verfasst von: Himmel, Hans-Jörg [VerfasserIn]
• Verfasst von: Zaumseil, Jana [VerfasserIn]
• Verfasst von: Sirringhaus, Henning [VerfasserIn]
• Titel: Charge and thermoelectric transport in polymer-sorted semiconducting single-walled carbon nanotube networks
• Verf.angabe: Martin Statz, Severin Schneider, Felix J. Berger, Lianglun Lai, William A. Wood, Mojtaba Abdi-Jalebi, Simone Leingang, Hans-Jörg Himmel, Jana Zaumseil, and Henning Sirringhaus
• E-Jahr: 2020
• Jahr: November 9, 2020
• Umfang: 14 S.
• Fussnoten: Gesehen am 02.04.2022
• Titel Quelle: Enthalten in: American Chemical SocietyACS nano
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2020
• Band/Heft Quelle: 14(2020), 11 vom: Nov., Seite 15552-15565
• ISSN Quelle: 1936-086X
• DOI: doi:10.1021/acsnano.0c06181
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1797404431

Abstract

Understanding the charge transport mechanisms in chirality-selected single-walled carbon nanotube (SWCNT) networks and the influence of network parameters is essential for further advances of their optoelectronic and thermoelectric applications. Here, we report on charge density and temperature-dependent field-effect mobility and on-chip field-effect-modulated Seebeck coefficient measurements of polymer-sorted monochiral small-diameter (6,5) (0.76 nm) and mixed large-diameter SWCNT (1.17-1.55 nm) networks (plasma torch nanotubes, RN) with different network densities and length distributions. All untreated networks display balanced ambipolar transport and electron-hole symmetric Seebeck coefficients. We show that charge and thermoelectric transport in SWCNT networks can be modeled by the Boltzmann transport formalism, incorporating transport in heterogeneous media and fluctuation-induced tunneling. Considering the diameter-dependent one-dimensional density of states (DoS) of the SWCNTs composing the network, we can simulate the charge density and temperature-dependent Seebeck coefficients. Our simulations suggest that scattering in these networks cannot be described as simple one-dimensional acoustic and optical phonon scattering as for single SWCNTs. Instead the relaxation time is inversely proportional to energy (τ ∝ (E - EC)s, s = −1, EC being the energy of the first van Hove singularity), presumably pointing toward the more two-dimensional character of scattering events and the necessity to include scattering at the SWCNT junctions. Finally, our observation of higher power factors in trap-free, 1,2,4,5-tetrakis(tetramethylguanidino)benzene-treated (6,5) networks than in the RN networks emphasizes the importance of chirality selection to tune the width of the DoS. To benefit from both higher intrinsic mobilities and a large thermally accessible DoS, we propose trap-free, narrow DoS distribution, large-diameter SWCNT networks for both electronic and thermoelectric applications.