Generalized enhancement of charge injection in bottom contact/top gate polymer field-effect transistors with single-walled carbon nanotubes

Wang M, Jakubka F, Gannott F, Schweiger M, Zaumseil J (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Organic Electronics Elsevier

Book Volume: 15

Pages Range: 809-817

Journal Issue: 3

DOI: 10.1016/j.orgel.2014.01.013

Abstract

We investigate the influence of small amounts of dispersed single-walled carbon nanotubes (SWNTs) on the contact resistance and device characteristics of bottom contact/top gate polymer field-effect transistors (FETs). Five conjugated polymers representing different classes of polymer semiconductors with different HOMO/LUMO levels are employed, namely, polythiophenes (P3HT), polyphenylenevinylenes (MDMO-PPV), polyfluorenes (F8T2), naphthalene-bis(dicarboximide) bithiophene copolymers (P(NDI2OD-T2)), and diketopyrrolo-pyrrole-bithiophene copolymers (DPPT-TT). In all cases the presence of dispersed SWNTs reduces non-ohmic contact resistance and lowers threshold and onset voltages for charge transport. In some cases inherent ambipolar charge transport in conjugated polymers (F8T2 and P(NDI2OD-T2)) is revealed. The concentration of the SWNTs within the semiconducting layer remains below the percolation limit and thus the apparent mobilities and on/off ratios are still determined by the polymer and independent of the specific type of the carbon nanotubes (metallic or semiconducting). The degree of enhancement depends both on the energy level offset between the injecting gold electrode and the HOMO/LUMO level (i.e., Schottky barrier) and the charge carrier mobility of the respective polymer. The simplicity of this injection enhancement method and its broad applicability make it a step toward high performance polymer transistors without injection limitations.

Authors with CRIS profile

Ming Wang Sonderforschungsbereich 953/3 Synthetische Kohlenstoffallotrope Florian Jakubka Professur für Werkstoffwissenschaften (Computational Materials Microscopy) Florentina Gannott Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Manuel Schweiger Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Jana Zaumseil Professur für Werkstoffwissenschaften (Computational Materials Microscopy)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM)

How to cite

APA:

Wang, M., Jakubka, F., Gannott, F., Schweiger, M., & Zaumseil, J. (2014). Generalized enhancement of charge injection in bottom contact/top gate polymer field-effect transistors with single-walled carbon nanotubes. Organic Electronics, 15(3), 809-817. https://doi.org/10.1016/j.orgel.2014.01.013

MLA:

Wang, Ming, et al. "Generalized enhancement of charge injection in bottom contact/top gate polymer field-effect transistors with single-walled carbon nanotubes." Organic Electronics 15.3 (2014): 809-817.

BibTeX: Download