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Description:

Even though charge transport in semiconducting polymers is of relevance for a number of potential applications in (opto-)electronic devices, the fundamental mechanism of how charges are transported through organic polymers that are typically characterized by a complex nanostructure is still open. One of the challenges which we address here, is how to gain experimental access to charge transport at the sub 50 nm lengthscale in a controlled fashion. To this end charge transport in single poly(diketopyrrolopyrrole-terthiophene) (PDPP) fiber transistors, employing two different solid gate dielectrics, a hybrid Al2O3/self-assembled monolayer (SAM) and hexagonal boron nitride (hBN), is investigated in the sub 50 nanometer regime using electron-beam contact patterning. The electrical characteristics exhibit near ideal behavior at room temperature which demonstrate the general feasibility of the nanoscale contacting approach, even though the channels are only few nm in width. At low temperatures, we observe nonlinear behavior in the current-voltage characteristics in the form of Coulomb diamonds which can be explained by the formation of an array of multiple quantum dots at cryogenic temperatures.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Charge transport, semiconducting polymers, Coulomb diamonds

Date published: 2023-01-01

Publisher: IOP Publishing

Journal:

• Journal of Physics: Materials (ISSN: 25157639) vol. 6 issue. 1 015001

Funding:

• Japan Society for the Promotion of Science KAKENHI (Grant Numbers 19H05790 and 20H00354)
• Center for NanoScience, Ludwig-Maximilians-Universität München
• Solar Technologies go Hybrid
• Deutsche Forschungsgemeinschaft EXC 2089 /1−390776260 (e-conversion)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1088/2515-7639/aca82f

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Updated at: 2025-02-26 12:30:40 +0900

Published on MDR: 2025-02-26 12:30:40 +0900