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The Impact of Grain Boundaries on Charge Transport in Polycrystalline Organic Field-Effect Transistors

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005758
URN to cite this document: urn:nbn:de:bvb:703-epub-5758-5

Title data

Meier, Tobias ; Bässler, Heinz ; Köhler, Anna:
The Impact of Grain Boundaries on Charge Transport in Polycrystalline Organic Field-Effect Transistors.
In: Advanced Optical Materials. Vol. 9 (2021) Issue 14 . - No. 2100115.
ISSN 2195-1071
DOI der Verlagsversion: https://doi.org/10.1002/adom.202100115

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Abstract

The active element of an organic field effect transistor (OFET) is a polycrystalline transport layer. The crystallites are interrupted by grain boundaries (GB) that can act as traps or barriers to the charge-carriers. Their impact on charge transport and hence on the performance of the OFET is still not fully understood. Employing kinetic Monte Carlo studies, the authors set up well-defined test systems and explore how the parameters of the system, for example, the thickness of the GB, their fractional contribution to the overall film, and the energies of the GB relative to the crystallites, affect the performance of the OFET. It is found that these parameters control the position of the Fermi level, which is crucial in controlling whether the charge transport is confined to GB, or whether it takes place as a superposition between filamentary transport in the boundaries and delocalized transport in the crystallites, or as tunneling-mediated transport across the crystallites. Guidelines for the morphological optimization of the films for these different transport modes are derived.

Further data

Item Type: Article in a journal
Keywords: activation energy; charge mobility; Monte-Carlo simulations; morphology; organic field-effect transistors; organic semiconductor
DDC Subjects: 500 Science > 530 Physics
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Research Institutions
Research Institutions > Research Centres
Research Institutions > Affiliated Institutes
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5758-5
Date Deposited: 03 Sep 2021 07:53
Last Modified: 03 Sep 2021 07:53
URI: https://epub.uni-bayreuth.de/id/eprint/5758

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